AGK
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- 10493
- Ignition occurs in each cylinder of a four stroke engine (MC = Top Dead Centre): before TDC at each second crankshaft revolution.
- 12280
- The lubricating system of an air cooled piston engine is used to: reduce internal friction and provide cooling.
- 779
- The purpose of baffle check valves fitted in aircraft fuel tanks is to: prevent fuel movement to the wing tip.
- 10049
- To achieve reverse thrust on a 'big fan' turbine engine, it is necessary to: deflect the fan thrust.
- 12073
- A mixture setting richer than best power has to he used during climb segments. This results in a lower cylinder head temperature.
- 10429
- A pressure regulator is used in a hydraulic system: In conjunction with a constant deliveiy type pump.
- 12086
- Regarding a thermal wing anti-icing system, the correct statement is: Aerodynamic performances of the wings are maintained and there is a reduction of maximum engine thrust.
- 2984
- During take-off, the fan in a high by-pass ratio turbofan engine produces: the greater part of the thrust.
- 12033
- An artificial feel system: functions in parallel to an irreversible servo-control unit
- 10041
- Turbine blade stages may he classed as eitherirnpulse' orreaction'. In an impulse blade section the pressure (i).. across the nozzle guide vanes and (ii).. across the rotor blades: (i) drops (ii) remains constant
- 10050
- In a free turbine engine: there is no mechanical connection between the compressor and the power output shaft.
- 12299
- The wing ice protection system currently used for most large turboprop transport aeroplanes is a(n): pneumatic system with inflatable boots.
- 12035
- The first indication of carburettor icing, in aeroplanes equipped with constant speed propellers, during cruise would most likely be a: decrease in manifold pressure.
- 3610
- A turbocharger consists of a: compressor and turbine mounted on a common shaft.
- 3143
- The purpose of the blow-in-doors at the air inlets is to: provide the engine with additional air at high power settings and low air speeds.
- 12517
- When TAS increases, the blade angle of a constant speed propeller will (RPM and throttle levers are not moved): increase.
- 12065
- A static inverter is powered by: direct current and produces an alternating current output
- 736
- A torsion link assembly is installed on the landing gear to: avoid rotation of the piston rod relative to the gear oleo strut
- 2015
- The blade angle of a constant-speed propeller increases with increasing true air speed.
- 830
- The diagram shown in annex represents a jet fuel system. The fuel-flow measurement is carried out : after high pressure valve (item 4).
- 5391
- Using compressor bleed air to power systems: decreases aircraft performance
- 12109
- On a normally aspirated engine, the manifold pressure gauge always indicates: a lower value than atmospheric pressure when the engine is running.
- 3658
- The reason for the fact that an aeroplane designed for long distances cannot simply be used for shod haul flights at higher frequencies is that the lifetime of the fatigue sensitive parts has been based on a determined load spectrum
- 10070
- Severe compressor stall can be indicated amongst others by: a rise in turbine gas temperature (101) and a change in vibration level.
- 3699
- To allow for failure of the normal method of system pressure limiting control, a hydraulic system often incorporates a high pressure relief valve.
- 10541
- The diffuser in a centrifugal compressor is a device in which the: pressure rises and velocity falls.
- 2880
- In flight, if the constant speed drive (CSD) temperature indicator is in the red arc the: pilot must disconnect it, and the generator is not available for the rest of flight.
- 12071
- A pilot can actuate the feathering system by: pulling the propeller control lever rearwards.
- 3150
- In computer technology. a storage peripheral is a: hard disk drive
- 12126
- If an engine detonates during climb-out, the normal corrective action would be to: retard the throttle.
- 2430
- A diluter demand oxygen regulator selected to '100%': delivers oxygen flow when inhaling.
- 421
- In a cabin air conditioning system. equipped with a bootstrap, the mass air flow is routed via the: secondary heat exchanger outlet to the turbine inlet of the cold air unit.
- 12298
- The purpose of a variable bypass valve, fitted between the LP and HP compressor of an axial now compressor, is to: prevent stall in the LP compressor.
- 2480
- A relay is: a magnetically operated switch.
- 2390
- On the ground, the Auxiliary Power Unit (APU) can provide: 1. electricity 2. air for starfing system 3. hydraulic pressure 4. air for air conditioning The combination which regroups all of the correct statements is: 1, 2, 4.
- 2433
- In jet transpoif aircraft, breathing oxygen for the cockpit is stored in the following state: Gaseous.
- 2396
- The Instrument Landing System (ILS) uses the following wavelengths: metric.
- 12151
- In a typical bootstrap cooling system the supply air is: compressed, passed through a secondary heat exchanger, and then across an expansion turbine.
- 10473
- Fuel pressure is measured: In the line between the booster pump and the engine or at the outlet of the high pressure filter.
- 2463
- It may be determined that an aircraft is not properly bonded if: static noises can be heard on the radio.
- 3467
- The function of a NOT logic gate within a circuit is to: invert the input signal such that the output is always of the opposite state.
- 12312
- The pressurization of fuel tanks is maintained by: the fuel vent system.
- 1324
- The wing of an aircraft in flight, powered by engines located under the wing, is subjected to a bending moment which causes its leading edge. from the wing root to the wing tip, to operate in: compression, and then tension.
- 3618
- Turbine blade stages may he classed as eitherirnpulse' orreaction'. In an impulse turbine stage: the pressure drops across the stator blades and remains constant across the rotor blades.
- 2974
- Under normal running conditions a magneto draws primary current: from a self-contained electro-magnetic induction system.
- 3051
- In jet aeroplanes the Thermal anti-ice system' is primarily supplied by bleed air from the engines.
- 12127
- In a free turbine engine. the energy delivered by the free turbine stages: is dependent on the rotational speed of the gas generator.
- 2208
- The octane rating of a fuel characterises the : the anti-knock capability
- 157
- The cabin pressure is regulated by the: Outflow valve.
- 10589
- VLO is the maximum: speed at which the landing gear can be operated with full safety.
- 10531
- Temperature regulation of an air conditioning system: Is automatically controlled by sensing the output temperature from the control valve in relation to the temperature set on the pilot's control panel.
- 3831
- A substance which may never be used in the vicinity or on parts of an omen installation is: Grease
- 3429
- If Iwo constant frequency AC generators are operating independently, then the phase relation between both generators: is unimportant.
- 12040
- Because of the connection in parallel of electrical equipments on an AC bus bar, isolation of individual equipments: decreases the bus bar current consumption.
- 10523
- Regarding fire detection. Ion detectors are used to detect: smoke.
- 2020
- The main advantage of a constant speed propeller as compared to a fixed pitch propeller is a: high efficiency in a much wider speed range of the aeroplane.
- 12531
- When altitude increases without adjustment of the mixture ratio, the piston engine performance is affected because of: a decrease of air density with a fuel flow which becomes too high.
- 12089
- Temperature regulation of an air conditioning system: Is automatically controlled by sensing the output temperature from the control valve in relation to the temperature set on the pilot's control panel.
- 3809
- A turbocharger system is normally driven by: the exhaust system.
- 12124
- If the automatic control of an air conditioning system fails: The pilot can revert to manual control and 'beeps:the control valve to the required setting.
- 12142
- In the event of an AC generator fault, on a twin engine aeroplane, the protection device will open: the exciter control relay and the generator breaker.
- 154
- Cabin pressure is controlled by: delivering a substantially constantflow of air into the cabin and controlling the outflow.
- 3132
- The conditions which can cause knocking are: High manifold pressure and low revolutions per minute.
- 10568
- The replenishment of an onboard oxygen bottle must be done: with the engine(s) off.
- 3706
- The paif of a piston engine that transforms reciprocating movement into rotary motion is termed the: crankshaft
- 777
- On a transport type aircraft the fuel tank system is vented through: Ram air scoops on the underside of the wing.
- 2873
- The function of the selector valve is to: communicate system pressure to either side of an actuator.
- 766
- Main cabin temperature is: controlled automatically, or byflight crew selection.
- 3637
- On large aeroplanes equipped with power brakes, the main source of power is derived from: the aeroplane's hydraulic system.
- 1245
- The main purpose of a Constant Speed Drive unit is to: maintain a constant frequency.
- 3708
- In a piston engine if the ratio of air to fuel is approximately 9:1 the mixture is: rich.
- 10490
- If the automatic control of an air conditioning system fails: The pilot can revert to manual control and 'beeps:the control valve to the required setting.
- 12531
- When altitude increases without adjustment of the mixture ratio, the piston engine performance is affected because of: a decrease of air density with a fuel flow which becomes too high.
- 3611
- In a single spool gas turbine engine. the compressor rpm is: the same as turbine rpm.
- 3707
- Which one of the following factors would be most likely to increase the possibility of detonation occurring within a piston engine? High cylinder head temperature.
- 12140
- On a high by-pass ratio (fan) engine, reverse thrust is achieved by reversing: onlythe direction of the fan airflow.
- 12133
- For a subsonic airflow, air passing through a divergent duct: decreases in velocity and increases in pressure.
- 2973
- The purpose of an ignition switch is to: control the primary circuit of the magneto
- 3608
- The reading on the oil pressure gauge is the: pressure of the oil on the outlet side of the pressure pump.
- 12280
- The lubricating system of an air cooled piston engine is used to: reduce internal friction and provide cooling.
- 10549
- The greatest risk created by a free turbine overspeed is: bursting of the free turbine disk
- 10434
- A single action actuator Is powered in one direction only by hydraulic power, the return movement being under spring force.
- 3431
- A bus-bar is: a distribution pointfor electrical power.
- 12130
- Generally, on modern jet transport aeroplanes, if there is a complete hydraulic system failure, the landing gear can be extended by: gravity extension.
- 799
- The heating facility for the windshield of an aircraft is: Used on a continual basis as it reduces the thermal gradients which adversely affect the useful life of the components.
- 10525
- Rotor brake discs are manufactured from: Steel or carbon fibre.
- 5401
- The control of free turbine engines on turboprops, is accomplished by:; - a propeller control lever used to select:; 1 - propeller RPM; 2 - turbine temperature; 3 - turbine RPM; - a fuel control lever used to select:; 4 -propeller RPM; 5 - torque; 6 - turbine temperature; The combination which regroups all of the correct statements is : 1/05/2006
- 3491
- In order that DC generators will achieve equal load sharing when operating in parallel, it is necessary to ensure that: their voltages are almost equal.
- 12286
- The main purpose of the mixture control is to: adjust the fuel 'Dow to obtain the correct fuelfair ratio.
- 3634
- In the hydraulic press schematically shown, what balancing Force would he acting on the left hand side ? (The diagram is not to scale) 100 N.
- 10470
- Fuel now information: May be displayed on a cockpit gauge and passed to the auto-pilot and navigational systems.
- 5377
- On an aircraft landing gear. an under-inflated tyre: will wear at the shoulders
- 3661
- A pressurized aeroplane is operated at FL 300. It undergoes a rapid decompression so that the pressure in the cabin goes quickly down to the outside pressure value. What happens concerning the oxygen system ? the oxygen masks are automatically presented to cabin crew members and passengers
- 756
- In a modern hydraulic system. 'hydraulic fuses' can be found. Their function is: To prevent total system loss in case of a leaking hydraulic line.
- 12314
- The operating principle of magnetos in a piston engine ignition system consists of: breaking the primary circuit in order to induce a low amperage, high voltage current, which is distributed to the spark plugs.
- 751
- Hydraulic fluids used in systems of large modern airliners are: Phosphate ester base fluids.
- 3457
- On an aeroplane using AC as primary power supply, the batteries are charged in flight from: a Transformer Rectifier Unit
- 3831
- A substance which may never be used in the vicinity or on parts of an omen installation is: Grease
- 3659
- The ABS (Auto Brake System) is being disconnected after landing .. by pilot action
- 165
- The 'cabin differential pressure' is: cabin pressure minus ambient pressure.
- 3141
- The crank assembly consists of crankshaft, connecting rods and pistons.
- 10446
- Assuming an accumulator is pre-charged with air to 1000 psi and the hydraulic system is pressurised to 1500 psi, the accumulator gauge will read: 1500 psi.
- 3649
- An impulse magneto coupling gives a retarded spark at starling
- 2018
- When increasing true airspeed with a constant engine RPM, the angle of attack of a fixed pitch propeller: reduces.
- 827
- On a jet aircraft fuel heaters are: Located on the engines.
- 12111
- The connection in parallel of two 12 voltf40 amp hours batteries, will create a unit with the following characteristics: 12 volt/80 amp hours
- 5399
- In case of smoke in the cockpit, the crew oxygen regulator must be set to: 100%
- 737
- In a commercial transport aeroplane the landing gear normal operating system is usually: hydraulically driven.
- 2209
- The fuel temperature, at which, under standard conditions, the vapour ignites in contact with a flame and extinguishes immediately, is the: flash point
- 5387
- The frequency of the current provided by an alternator depends on... its rotation speed
- 10519
- On starting, in a brushless AC generator with no commutator rings, the generator is activated by: a set of permanent magnets.
- 2877
- The most widely used electrical frequency in aircraft is: 400 Hz.
- 3071
- The torque of an aeroplane engine can be measured at the: gear box which is located between the engine and the propeller.
- 12283
- The function of a scissor (torsion link) in a landing gear is to: prevent any rotation of the oleo strut in the landing gear shock absorber.
- 12533
- What may happen during a continuous climb with a mixture setting fully rich? Fouling of spark plugs.
- 160
- Under normal conditions (JAR 25) the cabin pressure altitude is not allowed to exceed: 8,000ft
- 10476
- Fuel system indications available to the pilot are normally restricted to: Fuel contents; Fuel low level; Fuel pressure; Fuel flow; Fuel transfer status; Fuel filter condition.
- 3614
- The primary reason for a limitation being imposed on the temperature of the gas flow is to: ensure that the maximum acceptable temperature at the turbine blades is not exceeded.
- 12021
- During take-off, the angle of attack of the blades of a fixed pitch propeller, optimised for cruise condition is: relatively high.
- 3512
- For internal cooling, reciprocating engines are especially dependent on: the circulation of lubricating oil
- 3523
- In addition to the fire hazard introduced, excessive priming should be avoided because: it washes the lubricant of cylinder walls
- 12102
- A gas turbine engine turbine section may employ active clearance control: to provide enhanced clearances between the blade tips and the casing.
- 14179
- An abortive (hung) start is the term used to describle an attempt to start in which the engine:Lights up, but fails to accelerate sufficiently.
- 3073
- The conditions under which you obtain the highest engine power are: cold and thy air at high pressure.
- 162
- On a modern large pressurized transport aircraft, the maximum cabin differential pressure is approximately: 7 - 9 psi
- 3517
- In an engine equipped with a float-type carburettor, the low temperature that causes carburettor ice is normally the result of: vaporization of fuel and expansion of the air in the carburettor
- 12310
- The purpose of a compressor bleed valve is to prevent surging: at low compressor rpm.
- 11413
- The power required for field excitation of the main rotor in modem constant-frequency alternators is directly controlled by: the voltage regulator.
- 2982
- In a gas turbine engine. the power changes are normally made by controlling the amount of: fuel supplied.
- 12106
- A cabin rate of descent: results in a cabin pressure increase.
- 775
- The fuel cross-feed system: allows feeding of any engine from any fuel tank
- 5396
- The main feature of 8CF tire extinguishers is that they: act as flame inhibitors by absorbing the airs oxygen.
- 3524
- The primary purpose of a supercharger is to: maintain power at altitude
- 1238
- When the AC generators are connected in parallel, the reactive loads are balanced by means of the: energizing current
- 12536
- When the combustion gases pass through a turbine the:pressure drops.
- 3466
- Because of the input/output relationship of an AND gate, it is often referred to as the: 'all or nothing' gate.
- 12524
- Which one of the following factors would be most likely to increase the possibility of detonation occurring within a piston engine? High cylinder head temperature.
- 3130
- An EGT (Exhaust Gas Temperature) indicator for a piston engine is used to: assist the pilot to set the correct mixture.
- 10577
- The use of too low an octane fuel may cause: detonation.
- 12036
- The demand valve of a diluter-demand type oxygen regulator in normal mode, operates when the: user breathes in.
- 12147
- In a four-stroke piston engine. the only'driving' stroke is: power
- 2888
- The capacitance type fuel gauging system indicates the fuel quantity by measuring the: dielectric change between fuel and air.
- 3638
- Fire precautions to be observed before refuelling are: All bonding and connections to the earth terminal between ground equipment and the aircraft should be made before tiller caps are removed.
- 12032
- An axial compressor, when operating below its design speed, has: a tendency to stall in the front stages.
- 3598
- The reason for having a low pressure fuel-cooled oil cooler in a recirculatory type oil system is to: cool the oil and heat the fuel.
- 770
- On most transport aircraft, the low pressure pumps of the fuel system are: centrifugal pumps, driven by an electric motor.
- 10588
- VLE is the maximum: flight speed with landing gear down
- 3459
- When the supply frequency in a circuit with a capacitor is increased, the current in this circuit will: increase.
- 10455
- Dual ignition provides a factor of reliability and improves combustion efficiency.
- 4781
- When selected to normal, the oxygenfair ratio of the mixture supplied by the cockpit oxygen system regulator: increases when the altitude increases.
- 12114
- The blade angle of a propeller is the angle between the: reference chord line and the propeller plane of rotation.
- 161
- Cabin altitude is the: cabin pressure expressed as altitude.
- 12288
- The mixture controller of a carburettor: varies the fuel supply to the main discharge nozzle.
- 12301
- The wavelength of a radio signal transmitted at the frequency of 75 MHz is: 4 m.
- 10461
- Filters in hydraulic systems often incorporate pop out indicators to: Warn of an impending by-pass situation.
- 12101
- A Krueger Clap is normally located at the: leading edge.
- 12134
- For a piston engine, the chemically correct fuellair ratio is: 1:15
- 3131
- During climb with constant throttle and RPM lever setting (mixture being constant) the: Manifold Absolute Pressure (MAP) decreases.
- 5399
- From the cruise, with all the parameters correctly set, if the altitude is reduced, to maintain the same mixture the fuel flow should: increase
- 5370
- For a fan jet engine, the by-pass ratio is the: cold air mass flow divided by the hot air mass flow.
- 3428
- The primary function of a constant speed drive (CSD) in an AC generating system is to: drive the generator at a constant speed.
- 12154
- In a piston engine if the ratio of air to fuel is approximately 9:1 the mixture is: rich.
- 11412
- An artificial feel unit is necessary in the pitch channel when: the elevators are actuated by irreversible servo-control units.
- 12097
- Engine temperature limitations are usually imposed due to temperature limitations on the: turbine section.
- 2389
- The wavelength of a non-directional beacon (NDB) at a frequency of 300 kHz is: 1000 metres.
- 729
- The trim tab: reduces hinge moment and control surface efficiency.
- 12523
- Which statement is correct concerning the effect of the application of carburettor heat? The density of the air entering the carburettor is reduced, thus enriching the fuel/air mixture.
- 12107
- Significant torsion effects in a wing during flight can he caused by: aileron deflection.
- 792
- Concerning electrically powered ice protection devices, the only true statement is: on modern aeroplanes, electrically powered thermal devices are used to prevent icing on small surfaces (pitot-static, windshield...).
- 2872
- In some aircraft, there is a protection device to avoid the landing gear being inadvertently retracted on the ground. It consists of: A latch located in the landing gear lever.
- 12023
- During night, the wing anti-ice system has to protect a part of the whole leading edge.
- 2377
- In the axial flow compressor of a turbo-jet engine. the flow duct is tapered. Its shape is calculated so as to: maintain a constant axial speed in cruising flight
- 12009
- The purpose of the floor proximity emergency escape path marking system is to: give additional guidance during an emergency evacuation with a reduced cabin visibility.
- 12072
- A passenger oxygen mask is: a continuous flow mask and in principle should not be used if there is smoke in the cabin.
- 12132
- For a subsonic airflow, in a divergent duct the: pressure increases, velocity decreases and temperature increases.
- 5404
- Spark plug fouling is more likely to happen if: the aircraft descends continuously at idle power.
- 12129
- In a gas turbine engine lubrication system. the oil to fuel heat exchanger provides: oil cooling through thermal exchange with the fuel.
- 4389
- Smoke detectors titled on transpoif aircraft are of the following type: optical or ionization
- 22
- Engine bleed air used for air conditioning and pressurization in turbo-jet aeroplanes is usually taken from the: compressor section.
- 5365
- When a bimetallic strip is used as a switch in a fire detection loop, a fire alarm is triggered after a delay. The purpose of this delay is to: avoid false alarms in case of vibrations
- 12019
- An impulse coupling is installed on a magneto of a piston engine to: provide a stronger spark on top dead centre for engine starling.
- 752
- Hydraulic power is a function of: System pressure and volume flow.
- 3146
- On four-stroke piston engines, the theoretical valve and ignition settings are readjusted in order to increase the: overall efficiency
- 2879
- The so-called 'hot buses' or'direct buses' are: directly connected to the batten,.
- 5415
- The connection in parallel of two 12 voltf40 amp hours batteries, will create a unit with the following characteristics: 12 volt/80 amp hours
- 12025
- Dual ignition provides a factor of reliability and improves combustion efficiency.
- 730
- The purpose of a trim tab (device) is to: reduce or to cancel control forces.
- 762
- if the cabin altitude rises (aircraft in level flight), the differential pressure: decreases
- 3612
- When the combustion gases pass through a turbine the: pressure drops.
- 789
- When air is compressed for pressurization purposes, the percentage oxygen content is: unaffected.
- 778
- The types of fuel tanks used on most modem transport aircraft are: Integral tanks.
- 167
- The maximum cabin differential pressure of a pressurised aeroplane operating at FL370 is approximately: 9.0 psi
- 10723
- Automatic temperature control of the system as shown, would he accomplished by: the temperature selector in conjunction with cabin sensors and the temperature regulator, modulating the mix valve.
- 12125
- If engine compressor air is bled off for engine anti-icing or a similar system. the turbine temperature: will rise.
- 5375
- In very cold weather, the pilot notices during startup, a slightly higher than normal engine oil pressure. This higher pressure: is normal, if it decreases after startup.
- 12135
- For a JAR25 aeroplane, spoilers are: upper wing surface devices, their deflection can he symmetrical or asymmetrical.
- 3617
- One of the purposes of the bleed valves fitted to axial flow compressors is to: reduce the tendency to compressor stall.
- 5369
- A stage in an axial compressor: consists of a rotor disc followed by a ring of stator blades.
- 12309
- The purpose of a chip detector in the oil system of an engine/gearbox is to indicate that: there are metal particles in the oil.
- 12031
- An EGT (Exhaust Gas Temperature) indicator for a piston engine is used to: assist the pilot to set the correct mixture.
- 3521
- Vapour lock is: vaporizing of fuel prior to reaching the carburettor
- 12011
- The purpose of the barometric correction in a fuel controller is to: maintain the correct fuel to air mass ratio when the altitude increases.
- 786
- A turbo compressor air conditioning system (bootstrap system) includes Iwo heat exchangers; the primary exchanger (P) and the secondary exchanger (S). The functions of these heat exchangers are as follows: P: precools the engine bleed air 5: cools air behind the pack's compressor.
- 2374
- The advantages of grounding the negative pole of the aircraft structure are:: 1. Weight saving: 2. Easy fault detection: 3. Increase of short-circuit risk; 4. Reduction of short-circuit risk; 5. Circuits are not single-wired lines: The combination regrouping all the correct statements is : 1, 2, 4
- 427
- The cabin heating supply in a heady( jet transport aircraft is obtained from: hot air coming from the engine's compressors.
- 3056
- Smoke detector systems are installed in the upper cargo compartments (class E).
- 12091
- One of the functions of an accumulator in a hydraulic system is: to damp pressure surges in the system.
- 3656
- A constant speed drive (CSD) aims at ensuring: thatthe electric generator produces a constantfrequency.
- 3701
- In a compensated capacitance type quantity indicating system, the contents gauge of a half-full fuel tank indicates a fuel mass of 8000 kg. If a temperature rise increased the volume of fuel by 5%. the indicated fuel mass would: remain the same.
- 5381
- For an aeroplane hydraulic supply circuit, the correct statement is: the security components comprise the filters, the pressure relief valves, the by-passes, and the fire shut-off valve.
- 3070
- The power of a piston engine, which is measured by a friction brake, is: brake horse power.
- 10044
- The by-pass air in a by-pass type gas turbine engine promotes lower specific fuel consumption by causing an overall: decrease in gas flow average velocity and higher propulsive efficiency.
- 12115
- The application of carburettor heating reduces the: density of air entering the carburettor, thus enriching the mixture.
- 12086
- A stage in an axial compressor: consists of a rotor disc followed by a ring of stator blades.
- 163
- On most modern airliners the cabin pressure is controlled by regulating the: Airflow leaving the cabin.
- 10050
- In a free turbine engine: there is no mechanical connection between the compressor and the power output shaft.
- 1758
- On a non-stressed skin type wing, the wing structure elements which take up the vertical bending moments Mx are: the spars.
- 4788
- When the door of a transport aeroplane, equipped with evacuation slides in the armed position, is opened from the outside the slide: is disarmed automatically.
- 12070
- A pressure relief valve in an oil system that does not seat correctly would result in: low oil pressure.
- 12028
- An oxygen supply system must be kept absolutely free of oil or grease as: these substances catch fire spontaneously in the presence of oxygen.
- 12084
- Regarding the chemical oxygen generator, to enable the oxygen to now, the passenger must: firmly pull the mask towards his face.
- 3640
- A modern Auxiliary Power Unit (APU) is designed to provide power for ground starting of an engine. It also supplies both in the air (subject to certification limitations) and on the ground: air conditioning and electrical services.
- 10527
- Should a hydraulic pump seize during operation: The quill drive will shear to offload and protectthe gearbox.
- 3616
- If air is tapped from a gas turbine HP compressor (engine N2 controlled). the effect on the engine pressure ratio (EPR) and the exhaust gas temperature (EGT) is that: EPR decreases and EGT increases.
- 2875
- The aircraft hydraulic system is designed to produce: high pressure and large flow.
- 1237
- If one of the 12 cells of a lead-acid battery is dead. the battery: is unserviceable.
- 10066
- On a high by-pass ratio (fan) engine, due to the distribution of the thrust, it is normal for reverse thrust to be achieved by reversing: only the direction of the fan airflow.
- 10594
- The damping element in a landing gear shock absorber used on large aircraft is: Oil.
- 12139
- In case of engine failure during flight the blades of a constant speed propeller in a single engine aeroplane, not fitted with feathering system move in the lowest pitch position bythe centrifugal force andfor the spring force.
- 4782
- When a cabin oxygen mask is pulled downwards, the passenger breathes: a mixture of oxygen and cabin air.
- 1761
- The purpose of static wick dischargers is to: dissipate static charge of the aircraft in flight thus avoiding radio interference as a result of static electricity.
- 3807
- The very rapid magnetic field changes (flux changes) in the primary coil of a magneto are accomplished by the: contact breaker points opening.
- 3449
- A current limiter fuse (thermal) in a DC system is used to: allow a short term overload before rupturing.
- 764
- During a normal pressurised climb after take-off: cabin pressure decreases more slowly than atmospheric pressure
- 4784
- The chemical oxygen generator supplies oxygen for about: 15 minutes.
- 3459
- When a battery is almost fully discharged there is a tendency for the: voltage to decrease under load.
- 10749
- The type of gate that requires all 'TRUE' inputs for a 'TRUE' output is: AND.
- 12063
- As altitude increases, the mixture ratio of a piston engine should be adjusted to: reduce the fuel flow in order to compensate for the decreasing air density.
- 10098
- The wavelength of a radio signal transmitted at the frequency of 75 MHz is: 4m
- 12152
- In a turbo compressor air conditioning system (bootstrap system). the purpose of the heat exchangers is to: cool the bleed air in front and behind the compressor of the air cycle machine.
- 12090
- One of the purpose of the fuel system booster pumps to be submerged in the fuel is: To facilitate the priming of the pumps.
- 14181
- Which statement is correct for a gas turbine engine with a constant speed propeller and free power turbinewhen the power setting is increased? I. The gas generator speed increases.II. The EGT decreases.;I is correct, II is incorrect
- 4869
- A passenger emergency mask is a : a continuous flow mask and cannot be used if there is smoke in the cabin.
- 12521
- With an aircraft fiffed with a fixed pitch propeller, during flight at normal cruising speed, one magneto fails completely. This will first cause: loss of approximately 100 rpm.
- 12146
- In night, a cantilever wing of an aeroplane containing fuel is subjected to vertical loads that produce a bending moment, which is: highest at the wing root
- 2373
- Pulling the fire shutoff handle causes a number of devices to disconnect. In respect of the AC generator it can be said that the: exciter control relay and the generator breaker open.
- 10477
- Fuel tank vents are: Fitted to the top of the tank to prevent tank collapse and are routed to the opposite upper part of the fuselage.
- 3488
- The function of an air cycle machine is to: cool the bleed air.
- 10536
- The Central Processing Unit (CPU) of a computer essentially consists of: 1. an Arithmetic and Logic Unit (ALU) 2. a control and timing unit 3. registers The combination which regroups all the correct statements is: 1,2,3
- 10520
- Overcentre mechanisms in landing gear systems are used to: Lock the landing gear in the up and/or down positions.
- 3620
- The capacity of a battery is the: amount of Ampere hours that a fully charged battery can supply.
- 12095
- On most transport aircraft, the low pressure pumps of the fuel system are: Centrifugal pumps.
- 10730
- Alternating current can be derived from direct current by: an inverter.
- 12268
- The wing of an aircraft in flight, powered by engines located under the wing, is subjected to a bending moment due to thrust and drag. The loading on the front spar of the torsion box from the wing root to the wing tip is: compression, and then tension.
- 2966
- Pre-ignition refers to the condition that may arise when: the mixture is ignited by abnormal conditions within the cylinder before the spark occurs at the plug
- 12282
- The function of an accumulator in a hydraulic brake system is: to supply a limited amount of brake energy in the event of failure of the hydraulic system normally supplying the brakes.
- 3890
- The term 'pressure cabin' applies when an aeroplane: has the means to maintain cabin pressure higher than ambient pressure.
- 3446
- A 3 phase AC generator has 3 separate stator windings spaced at: 120°.
- 3435
- Because of the input/output relationship of an OR gate, it is often referred to as the: 'any or all' gate.
- 2983
- In a free turbine engine: there is no mechanical connection between the compressor and the power output shaft.
- 3640
- A modern Auxiliary Power Unit (APU) is designed to provide power for ground starting of an engine. It also supplies both in the air (subject to certification limitations) and on the ground: air conditioning and electrical services.
- 3703
- With respect to a piston engine aircraft, ice in the carburettor: mayform at OAT's higher than +10°C.
- 10557
- The pilot may be prevented from retracting the landing gear whilst the aircraft is on the ground by: The electrical control system being routed through the weight on wheels switch.
- 12037
- Assuming cabin differential pressure has reached the required value in normal flight conditions, if flight altitude and air conditioning system setting are maintained: the mass air flow through the cabin is constant
- 3703
- With respect to a piston engine aircraft, ice in the carburettor: mayform at OAT's higher than +10°C.
- 772
- On most transport jet aircraft, the low pressure pumps of the fuel system are supplied with electric power of the following type: 115 VAC
- 2027
- When applying carburettor heating: the mixture becomes richer.
- 2972
- In a piston engine. the purpose of an altitude mixture control is to: correct for variations in the fuel/air ratio due to decreased air density at altitude.
- 4780
- Modern pressurized transport aeroplanes are equipped with: two independent oxygen systems, one supplying the cockpit, the other the cabin.
- 5405
- 'Vapour lock' is the phenomenon by which: heat produces vapour bubbles in the fuel line.
- 4787
- The advantages of a gaseous oxygen source for the passenger cabin are 1. a greater autonomy,: 2. no risk of explosion,: 3. reversible functioning,: 4. easy storage and maintenance,: 5. possibility to regulate flow.; The combination regrouping all the correct statements is : 1, 3, 5
- 3448
- An AC generator driven by a constant speed drive (CM): requires a voltage controller to maintain constant voltage under load.
- 1755
- Consider the variable-pitch propeller of a turbo-prop. During deceleration: when braking, the propeller supplies negative thrust and absorbs engine power.
- 3833
- The part of the flight that will cause the highest loads on the torsion link in a bogie gear is Taxiing with a small turning radius.
- 2497
- Landing gear torque links are used to: prevent rotation of the landing gear piston in the oleo strut.
- 3074
- The power output of a piston engine without supercharging increases with increasing altitude in standard atmosphere at constant Manifold Air Pressure (MAP) and RPM because of the: increase of the air density behind the throttle valve.
- 3660
- The purposes of the oil and the nitrogen in an oleo-pneumatic strut are: the oil supplies the damping function and the nitrogen supplies the spring function
- 3480
- Immediately after starting engine(s) with no other electrical services switched on, an ammeter showing a high charge rate to the battery: would be normal and is only cause for concern if the high charge rate persists.
- 2397
- The Distance Measuring Equipment (DME) uses the following wavelengths: decimetric.
- 3695
- An accumulator in a hydraulic system will: store fluid under pressure.
- 12092
- One of the advantages of a turbocharger is: to make the power available less affected by altitude.
- 2461
- The voltage of a fully charged lead-acid battery cell is: 2.2 volts.
- 12300
- The wing ice protection system currently used for most large jet transport aeroplanes is a(n): hot air system.
- 3511
- lithe ground wire between the magnetos and the ignition switch becomes disconnected the most noticeable result will be that: the engine cannot be shut down by turning the ignition switch to the 'OFF' position.
- 10521
- Parameters to monitor a hydraulic system in the cockpit can be: Pressure, fluid temperature and quantity.
- 3631
- 'Conditioned' air is air that has: been controlled in respect oftemperature and pressure.
- 2378
- In the stator of a turbine, the gas velocity V and static pressure Ps vary as follows: V increases, Ps decreases.
- 725
- In night, a cantilever wing of an aeroplane containing fuel is subjected to vertical loads that produce a bending moment, which is: highest at the wing root
- 828
- The automatic fuelling shut off valve: stops fuelling as soon as a certain fuel level is reached inside the tank.
- 781
- On most transport aircraft, the low pressure pumps of the fuel system are: centrifugal pumps, driven by an electric motor.
- 10471
- Fuel low level warnings usually provide the pilot with information regarding: The level of fuel in the supplytanks.
- 2885
- The hydraulic device similar to an electronic diode is a: check valve.
- 12149
- Exhaust gas temperature sensing is usually taken: between the gas generator turbine and the free power turbine.
- 741
- The type of brake unit found on most transport aeroplanes is a: Multiple disk brake.
- 3442
- The purpose of a voltage regulator is to control the output voltage of the: generator at vatying loads and speeds.
- 10424
- A magnetic plug can be used to collect ferrous particles.
- 10562
- The purpose of an accumulator in a hydraulic system is: to damp the fluid pressure variations.
- 10587
- Viscosity is the tendency of a liquid or gas to resistflow.
- 3149
- In computer technology, an input peripheral is a: keyboard.
- 2965
- A piston engine compression ratio is the ratio of the: total volume to the clearance volume.
- 2967
- Overheating of a piston engine is likely to result from an excessively: weak mixture.
- 12080
- For a fan jet engine, the by-pass ratio is the: cold air mass flow divided by the hot air mass flow.
- 5392
- A piston engine may use a fuel of a different grade than the recommended: provided that the grade is higher
- 5378
- In a turbo-jet, the purpose of the turbine is to ... drive the compressor by using part of the energy from the exhaust gases
- 12317
- The two deformation modes that cause wing nutter are: torsion and bending.
- 750
- Hydraulic fluids: Are irritating to eyes and skin.
- 2014
- When changing power on engines equipped with constant-speed propeller, engine overload is avoided by: increasing the RPM before increasing the manifold pressure.
- 3802
- The compression ratio of a piston engine is the ratio of the: volume of the cylinder with the piston at bottom dead centre to that with the piston at top dead centre.
- 12081
- Assuming a constant speed drive (CSD) fault is indicated, the CSD should be disconnected: provided the engine is running.
- 164
- If the maximum operating altitude of an aeroplane is limited by the pressurized cabin, this limitation is due to the maximum: Positive cabin differential pressure at maximum cabin altitude.
- 12315
- The octane rating of a fuel characterises the: resistance to detonation.
- 12418
- To maintain the correct airifuel ratio of a piston engine, independent of power setting, a carburettor is fitted with: a diffuser (compensating jet).
- 3697
- The schematic diagram annexed illustrates an actuator and a selector valve in a typical hydraulic system. Assuming hydraulic pressure throughout and no internal leakage: a condition of hydraulic lock exists and no movement of the piston will take place.
- 12529
- When leaning the mixture for the most economic cruise fuel flow, excessive leaning will cause: high cylinder head temperature
- 172
- In an aircraft air conditioning system the air cannot be treated for: humidity.
- 767
- The purpose of an air conditioning pack inlet flow valve (pack valve) is to: maintain a constant and sufficient air mass flow to ventilate the cabin.
- 3452
- The measured output power components of a constant frequency AC system are: WA and WAR.
- 3891
- If the pressure in the cabin tends to become lower than the outside ambient air pressure the: negative pressure relief valve will open.
- 2989
- A fuel strainer when fitted to a carburettor will he positioned: upstream of the needle valve.
- 2403
- The Automatic Direction Finder uses the following wavelengths: hectometric or kilometric.
- 12112
- The capacity of a battery is the: amount of Ampere hours that a fully charged battery can supply.
- 12089
- Assuming that during cruise night with air-conditioning packs ON, all the outflow valves close: the pressure differential would go to the maximum value.
- 12081
- Shimmy occurs on the nose wheel landing gear during taxiing when: 1. the wheels tend to describe a sinusoidal motion on the ground 2. the wheels no longer respond to the pilot's actions. This effect is overcome by means of: 3. the torque link ; 4. an accumulator associated with the steering cylinder. The combination of correct statements is: 1, 4.
- 3700
- The Ram Air Turbine (RAT) provides emergency hydraulic power for: flight controls in the event of loss of engine driven hydraulic power.
- 3692
- Assuming cabin differential pressure has attained the required value in normal night conditions, if flight altitude is maintained: a constant mass airflow is permitted through the cabin.
- 5319
- The correct statement about rain protection for cockpit windshields is that: rain repellent should never be sprayed onto the windshield unless the rainfall is very heavy.
- 2458
- The output of a generator is controlled by: varying the field strength.
- 3072
- The power of a piston engine decreases during a climb with a constant power lever setting because of the decreasing: air density.
- 12143
- In the airflow through a single-spool axial flow turbo-jet engine, the axial velocity of the air is greatest: on exit from the propelling nozzle.
- 10459
- Engine oil reservoirs are sometimes located at the front of the engine: To allowthe hot oil to heatthe air intake.
- 10580
- The viscosity of a hydraulic fluid should be: The lowest to minimize power consumption and resistance to flow.
- 12255
- A turbo compressor air conditioning system (bootstrap system) will: cause a pressure drop as well as an associated temperature drop in the charge air.
- 2436
- On detection of a persistent phase imbalance between an AC generator connected to the main bus bars and other AC generators, the protection device that opens isfare the: tie breaker(s).
- 3048
- The type of hydraulic fluid which has the greatest resistance to cavitation is: Synthetic fluid.
- 12304
- The vapour lock is: A stoppage in a fuel feeding line caused by a fuel vapour bubble.
- 12148
- In computer technology, an input peripheral is a: keyboard.
- 2372
- In an aircraft electrical system where AC generators are not paralleled mounted, the changeover relay allows: power supply to the faulty AC generators busbar.
- 3053
- The ice protection for propellers of modem turboprop aeroplanes works electrically.
- 2016
- A propeller blade is twisted in order to: maintain a constant angle of attack along the blade.
- 425
- In a 'bootstrap' cooling system, the charge air is first compressed in the cold air unit to: ensure an adequate pressure and temperature drop across the cooling turbine.
- 2395
- The VHF Omnirange (VOR) uses the following wavelengths: metric.
- 12138
- Hydraulic fluid, entering the hydraulic pump, is slightly pressurised to: prevent cavitation in the pump.
- 3519
- Which statement is correct concerning the effect of the application of carburettor heat? The density of the air entering the carburettor is reduced, thus enriching the fuel/air mixture.
- 12007
- The purpose of the venturi in a carburettor is to: create the suction necessaiy to cause fuel to flowthrough the carburettor main jets.
- 3652
- An impulse coupling is installed on a magneto of a piston engine to: provide a stronger spark on top dead centre for engine starling.
- 790
- In flight, the most commonly used anti-icing method for the wings of modern commercial aircraft fitted with turbo-jet units is: Thermal (use of hot air).
- 3801
- A reverse thrust door warning light on the flight deck instrument panel illuminates when: the reverser doors are unlocked.
- 14118
- Compared to a tyre fitted with an inner tube, a tubeless tyre presents the following characteristics: 1 - high heating 2 - valve fragility 3 - lower risk of bursting 4 - better adjustment to wheels The combination containing all the correct statements is:3 - 4;
- 12311
- The primary reason for a limitation being imposed on the temperature of gas now in a gas turbine is to: ensure that the maximum acceptable temperature at the turbine blades is not exceeded.
- 5398
- The gas turbine illustrated is of the following type: free turbine and centrifugal compressor
- 12119
- Generators, when connected to the same bus bar, are usually connected: in parallel mode.
- 4231
- The demand valve of a diluter-demand type oxygen regulator in normal mode, operates when the: user breathes in.
- 10543
- The engine fuel control unit (FCU) is protected from damage by debris by: The fine filter located between the high pressure fuel pump and the governor unit
- 3599
- A'hung start is the failure of an engine to accelerate to its normal idle speed. It may he caused by: an attempt to ignite the fuel before the engine has been accelerated sufficiently bythe starter.
- 4232
- The purpose of the 'Pressure Relief Valve' in a high pressure oxygen system is to: relieve overpressure if the pressure reducing valve malfunctions
- 10555
- The most common material used in the construction of gearbox casings is: Magnesium alloy.
- 12022
- During hydroplaning, the friction coefficient between tyre and runway surface is approximately: 0
- 12306
- The main advantage of a constant speed propeller as compared to a fixed pitch propeller is a: high efficiency in a much wider speed range of the aeroplane.
- 10419
- 'Conditioned' air is air that has: been controlled in respect oftemperature and pressure.
- 3606
- The purpose of a distributor in an ignition system is to distribute: secondary current to the sparking plugs.
- 12254
- About a twin spool compressor: The low pressure spool runs at a lower rpm than the high pressure spool.
- 168
- Pneumatic mechanical ice protection systems are mainly used for: wings.
- 2971
- Specific fuel consumption is defined as the: mass of fuel required to produce unit power for unittime.
- 3702
- Tyre 'creep' may be described as the: circumferential movement of the tyre in relation to the wheel flange.
- 4783
- Chemical oxygen generators are used to furnish oxygen to the: cabin only.
- 10578
- The ventilation system in a fuel tank: prevents low pressure or excessive overpressure in the tank.
- 12093
- Once the engine has starfed, ignition systems of piston engines are: independent of the electrical system of the aircraft.
- 10538
- The birnetal strip detectors of an engine fire detection system: 1 - are arranged in series. 2 - are arranged in parallel. 3 - open during a fire. 4 - close during a fire. The combination containing all of the correct statements is: 2 and 4 only.
- 10500
- In flight, the cabin air for large jet transport aeroplanes is usually supplied by: engine compressors.
- 753
- Large transport aeroplane hydraulic systems usually operate with a system pressure of approximately: 3000 psi
- 10443
- An electrically heated windscreen is manufactured from: A glass and polycarbonate laminate.
- 10729
- A static inverter is powered by: direct current and produces an alternating current output
- 12020
- Engine auxiliary gearboxes: provide the drives for a wide variety of services and may even provide for the support of the engine in the airframe.
- 10604
- Which one of the following factors would be most likely to increase the possibility of detonation occurring within a piston engine? using too lean a fuelfair mixture
- 12088
- A relay is: An electromagnetically operated switch.
- 5390
- The function of the Generator Breaker is to close when the voltage of the: generator is greater than battery voltage and to open when the opposite is true
- 3125
- During a climb in a standard atmosphere with constant Manifold Absolute Pressure (MAP) and RPM indications and at a constant mixture setting, the power output of a piston engine: increases.
- 12002
- The thermal efficiency of a piston engine is about: 30%
- 2970
- The working cycle of a four-stroke engine is: induction, compression, power, exhaust
- 2381
- One defintion of engine pressure ratio (EPR) is the ratio of: the total turbine outlet pressure to the total compressor inlet pressure.
- 12105
- A capacitor in parallel with breaker points: induces a very high voltage across the secondary windings.
- 3890
- The function of a fusible plug is to protect the tyre against explosion due to excessive temperature.
- 12252
- An aircraft flying in conditions of continuous heaw rain and high ambient temperatures may require the precautionary use of: engine igniters.
- 3626
- In an aircraft equipped with a DC main power system. AC for instrument operation may he obtained from: an inverter.
- 10522
- Power for windscreen heating is usually: 3 phase AC.
- 12103
- A continuous loop detector system is a: overheat detection system.
- 10736
- Generally, for large aeroplanes, electrical heating for ice protection is used on: Pitot tubes.
- 3456
- In an aeroplane fitted with a constant frequency AC power supply. DC power is obtained from a: transformer rectifier unit (TRU).
- 10498
- In a hydraulic system. the reservoir is pressurized in order to: prevent pump cavitation
- 12144
- In respect of a constant speed propeller of a twin engine aeroplane controlled by a single-acting pitch control unit: oil pressure turns the propeller blades towards smaller pitch angle.
- 3147
- In a four-stroke piston engine. the only'driving' stroke is: power
- 12001
- The thrust reversers of jet engines may use clamshell doors in order to: change the direction of the exhaust gas stream.
- 755
- The type of hydraulic oil used in modern hydraulic systems is: synthetic oil
- 10431
- A red or an amber light on an undercarriage position indicator signifies: At least one wheel is in the travelling or unlocked condition.
- 12120
- On detection of a persistent phase imbalance between an AC generator connected to the main bus bars and other AC generators, the protection device that opens isfare the: tie breaker(s).
- 171
- Cabin air forJAR 25 aeroplanes is usually taken from: the high pressure compressor.
- 3525
- An excessively rich mixture can be detected by: black smoke from exhaust.
- 12087
- Spark plug fouling is more likely to happen if: the aircraft descends continuously at idle power.
- 12302
- The wavelength of a radio signal transmitted at the frequency 118.7 MHz is: 2.53 m.
- 3621
- A test to assess the state of charge of a lead-acid battery would involve: comparing the 'on-load' and 'off-load' battery voltages.
- 1244
- An inverter is a: unit used to convert DC into AC.
- 12526
- When the AC generators are connected in parallel, the reactive loads are balanced by means of the: excitation current
- 3699
- When powering up a hydraulic system, the level in the reservoir will: decrease slightly.
- 2975
- On a normally aspirated aero-engine fitted with a fixed pitch propeller: manifold pressure decreases as the aircraft climbs at a fixed throttle selling.
- 2890
- The vapour lock is: A stoppage in a fuel feeding line caused by a fuel vapour bubble.
- 2450
- The illumination of the green landing gear light indicates that the landing gear is: locked-down.
- 10469
- Fuel flow information is: Measured in the line between the fuel control unit and the engine burners.
- 12094
- On the ground, the Auxiliary Power Unit (APU) can provide: 1. electricity 2. air for starfing system 3. hydraulic pressure 4. air for air conditioning The combination which regroups all of the correct statements is: 1, 2, 4.
- 2652
- The skip zone of HF-transmission will increase when the following change in circumstance occurs: Higher frequency and higher position of the reflecting ionospheric layer
- 173
- On modern transport aircraft, cockpit windows are protected against icing by: Electric heating.
- 3060
- The indication of the fire detection systems is performed by a: warning light and a warning bell (or aural alert).
- 2032
- For a given type of oil, the oil viscosity depends on the: oil temperature.
- 2462
- The capacity of a battery is given in: Ampere hours.
- 2978
- An engine pressure ratio (EPR) gauge reading normally shows the ratio of: jet pipe pressure to compressor inlet pressure.
- 3438
- When carrying out a battery condition check using the aircraft's voltmeter: a load should he applied to the batten( in order to give a better indication of condition.
- 1969
- When quick donning masks are in use. the pilot is: able to radiotelephone.
- 12535
- Turbine blade stages may be classed as eitherimpulse' orreaction'. In an impulse blade section the pressure (i)... across the nozzle guide vanes and (ii) ..... across the rotor blades: (i) drops(ii) remains constant
- 12534
- Turbine blade stages may he classed as eitherirnpulse' orreaction'. In an impulse turbine stage: the pressure drops across the stator blades and remains constant across the rotor blades.
- 743
- Thermal plugs are installed in: wheel rims.
- 1977
- What is breathed in when using a passenger oxygen mask? Cabin air and oxygen.
- 12153
- In a turbo compressor air conditioning system (bootstrap system) the supply of air behind the primary heat exchanger is: compressed, passed through a heat exchanger, and then across an expansion turbine.
- 706
- Reflection from ionospheric layers is used in the following radio frequencies: HF
- 12085
- Regarding Ohm's law: The current in a circuit is directly proportional to voltage.
- 2883
- The essential difference between aircraft AC alternators and DC generators (dynamos) is that the: induced (output) windings of the alternators are fixed (stator), and the dynamos have a fixed inductor (field) coil.
- 10454
- Cooling air for a reciprocating engine can be obtained by means of: ram air
- 1242
- In order to produce an alternating voltage of 400 Hz, the number of pairs of poles required in an AC generator running at 6000 rpm is: 4
- 12026
- Creep of turbine blades is caused by: high blade temperature whilst under centrifugal loading.
- 12121
- Ignition systems of a running piston engine receive electrical energy from: rotating permanent magnets.
- 3066
- The passenger oxygen mask will supply: a mixture of cabin air and oxygen.
- 12012
- The purpose of stringers, used in fuselage construction, is to: assist the skin withstand longitudinal compressive loads.
- 785
- In a turbo compressor air conditioning system (bootstrap system). the main water separation unit is: after the cooling turbine.
- 12157
- In a hydraulic system overheat detectors are mostly installed: at the pumps.
- 2886
- The cross-feed fuel system is used to: feed every engine from any fuel tank.
- 3129
- With which instrument(s) do you monitor the power output of an aeroplane fined with a fixed pitch propeller? RPM indicator.
- 3513
- In order to get the optimum efficiency of a piston engine, the positions of the intake and exhaust valve just after the power stroke are: intake valve closed and exhaust valve open.
- 10740
- The conditions to be met to activate a shunt generator are: 1. presence of a permanent field 2. closed electrical circuit 3. generator terminals short-circuited 4. minimum rotation speed The combination of correct statements is: 1,4
- 2417
- The compressor surge effect during acceleration is prevented by the: Fuel Control Unit (F.C.U.).
- 3450
- When operating two AC generators unparalleled, the phase relationship of each generator: is unimportant.
- 10552
- The lubricating system of an air cooled piston engine is used to: reduce internal friction and provide cooling.
- 12520
- With regard to pneumatic mechanical devices that afford ice protection the only correct statement is: They can only be used as de-icing devices.
- 3461
- Circuit breakers protecting circuits may be: used in AC and DC circuits.
- 3430
- To ensure correct load sharing between AC generators operating in parallel: both real an reactive loads must be matched.
- 10045
- If engine compressor air is bled off for engine anti-icing or a similar system. the turbine temperature: will rise.
- 10537
- The characteristics of a centrifugal compressor are: 1 - a high pressure ratio by stage. 2 - a large diameter. 3 - a low pressure ratio by stage. 4 - a small diameter. The combination containing all of the correct statements is: 1 and 2 only.
- 3055
- A gaseous sensor/responder tube fire sensor is tested by heating up the sensor with test power connection.
- 3632
- A cabin pressure controller maintains a pre-set cabin altitude by regulating the: position of the outflow valve(s).
- 12303
- The ventilation system in a fuel tank: prevents low pressure or excessive overpressure in the tank.
- 10448
- Axial piston pumps are often used in hydraulic systems due to: Their ability to produce high pressure when required but can he off loaded to reduce power consumption.
- 12088
- One reason to fit a tip shroud to a turbine blade is to: increase turbine efficiency.
- 159
- Cabin differential pressure means the pressure difference between: cabin pressure and ambient air pressure.
- 2434
- The advantages of alternating current on board an aircraft are: 1. simple connection 2. high starting torque 3. flexibility in use 4. lighter weight of equipment 5. easy to convert into direct current 6. easy maintenance of machines The combination of correct statements is: 3. 4, 5, 6
- 10726
- A'Zener diode is used for: voltage stabilisation.
- 2443
- The voltage regulator of a DC generator is connected in: series with the shunt field coil.
- 12113
- The by-pass air in a by-pass type gas turbine engine promotes lower specific fuel consumption by causing an overall: decrease in exhaust gas flow average velocity and higher propulsive efficiency.
- 2981
- Alan' stage of a ducted-fan turbine engine is driven by: the low pressure turbine.
- 12116
- The air in a piston engine supercharger enters the centrifugal compressor at: the eye of the impeller and leaves it almost at a tangent to the periphery.
- 5397
- In the propagation of MF waves, the phenomenon of FADING is particularly found: at night, due to the combination of the sky and ground waves.
- 10598
- When starting the engine, or when the engine is running at idle rpm on the ground, the mixture is: rich, to make starling possible and to cool the engine sufficiently when idling.
- 10462
- Filtration in a hydraulic system is usually ensured by: Filters in both the pressure and return lines.
- 12100
- A magnetic plug in an engine oil system can be used to: collect ferrous particles.
- 10586
- Vents in oil tanks are primarily to prevent excessive pressure from building up in tank
- 12104
- A constant speed drive (CSD) that has been disconnected in flight can be reset only on the ground after engine shut-down.
- 3646
- An aircraft magneto is switched off by grounding the primar), circuit
- 773
- The pressure usually produced by the booster pumps of the fuel supply system of a large jet transport aeroplane is within the following range: 20 to 50 psi
- 10730
- Alternating current can be derived from direct current by: an inverter.
- 5409
- Fuel pumps submerged in the fuel tanks of a multi-engine aircraft are: centrifugal low pressure type pumps.
- 12084
- A thermal circuit breaker: protects the system in the event of overload/overheating.
- 3696
- Assuming a hydraulic accumulator is pre-charged with air to 1000 psi. If the hydraulic system is then pressurised to its operating pressure of 3000 psi. the indicated pressure on the air side of the accumulator should be: 3000 psi.
- 3463
- The function of a CSD in an AC generating system is to: drive the generator at a constant speed.
- 3518
- Fuebrair ratio is the ratio between the: mass of fuel and mass of air entering the cylinder.
- 12157
- In a hydraulic system overheat detectors are mostly installed: at the pumps.
- 2022
- In case of engine failure during night the blades of a constant speed propeller in a single engine aeroplane, not fitted with feathering system move in the lowest pitch position by the centrifugal force andfor the spring force.
- 3148
- In computer technology, an output peripheral is a: screen unit.
- 3136
- The 'slipstream effect of a propeller is most prominent at: low airspeeds with high power selling.
- 3655
- A unit that converts electrical DC into AC is: an inverter.
- 3149
- Skip distance is the: range from the transmitter to the first sky wave
- 3126
- The kind of compressor normally used as a supercharger is: a radial compressor.
- 2878
- Assume a constant speed DC generator providing a constant output voltage. If the electrical load increases, the voltage regulator will: increase the intensity of the excitation current.
- 10458
- Engine cornpartrnent decking and firebvalls are manufactured from: Stainless steel ortitanium sheet.
- 2023
- For take-off, the correct combination of propeller pitch (1), and propeller lever position (2) at brake release is: (1) low (2) forward.
- 10544
- The first indication of carburettor icing, in aeroplanes equipped with constant speed propellers, during cruise would most likely be a: decrease in manifold pressure.
- 10602
- Windscreen heating systems usually: Cycle on/off to maintain a windscreen temperature between approximately 18° and 35°C.
- 2399
- The VHF direction finder uses the following wavelengths: metric.
- 747
- Hydraulic fluids must have the following characteristics:: 1. thermal stability; 2. low emulsifying characteristics: 3. corrosion resistance: 4. good resistance to combustion: 5. high compressibility; 6. high volatility; 7. high viscosity; The combination regrouping all the correct statements is : 1, 2, 3, 4
- 10495
- In a gas turbine engine. compressor blades, which are not rigidly fixed in position when the engine is stationary, take up a rigid position when the engine is running due to: the resultant of aerodynamic and centrifugal forces.
- 10423
- A freon air conditioning system comprises: A compressor and heat exchanger to provide cold air to the cabin with hot air supplied from the engine for heating.
- 3615
- In a gas turbine engine. compressor blades, which are not rigidly fixed in position when the engine is stationary, take up a rigid position when the engine is running due to: the resultant of aerodynamic and centrifugal forces.
- 5371
- The low pressure switch of a hydraulic circuit sets off an alarm if: the pump output pressure is insufficient.
- 12530
- When detonation is recognised in a piston engine, the correct procedure is to: reduce manifold pressure and fully enrich the mixture.
- 763
- The purpose of the cabin pressure controller, in the automatic mode, is to perform the following functions:; 1. control of cabin altitude,; 2. control of cabin altitude rate-of-change,; 3. limitation of differential pressure; 4. balancing aircraft altitude with cabin altitude; 5. cabin ventilation; 6. keeping a constant differential pressure throughout all the flight phases.; The combination regrouping all the correct statements is : 1, 2, 3
- 12141
- In what state is the breathing oxygen for the cockpit of jet transpoif aeroplanes stored: Gaseous.
- 12306
- The main advantage of a constant speed propeller as compared to a fixed pitch propeller is a: high efficiency in a much wider speed range of the aeroplane.
- 155
- During level night at a constant cabin pressure altitude (which could be decreased, even at this flight level). the cabin outflowvalves are: Partially open.
- 2449
- On starting, in a brushless AC generator with no commutator rings, the generator is activated by: a set of permanent magnets.
- 10567
- The rating of electrical fuses is expressed in: amperes.
- 2012
- The correct formula to calculate the total displacement of a multi-cylinder piston engine is the: piston area x piston stroke x number of cylinders
- 742
- The reason for fitting thermal plugs to aeroplane wheels is that they: prevent tyre burst
- 3691
- Under normal flight conditions, cabin pressure is controlled by: regulating the discharge of air through the outflow valve(s).
- 4230
- A continuous loop detector system is a: overheat detection system.
- 3710
- The oil system for a piston engine incorporates an oil cooler that is fitted : in the return line to the oil tank after the oil has passed through the scavenge pump
- 2977
- In a piston engine. turbocharger boost pressure may he monitored by: a manifold pressure gauge only.
- 12253
- After air has passed through the compressor of a gas turbine engine the: temperature will be higher than the inlet temperature.
- 787
- 'Conditioned' air is air that has: been controlled in respect oftemperature and pressure.
- 3515
- In which sections of the carburettor would icing most likely occur? venturi and the throttle valve
- 2024
- For piston engines, mixture ratio is the ratio between the: mass of fuel and mass of air entering the cylinder.
- 10724
- The hydraulic systems which works correctly is shown in the figure: b;
- 2017
- A pilot can actuate the feathering system by: pulling the propeller control lever rearwards.
- 12030
- An engine pressure ratio (EPR) can be defined as the ratio of: jet pipe total pressure to compressor inlet total pressure.
- 1971
- A fault protection circuit in a fire detection system will: inhibitthe fire detector when the detection line is connected to ground.
- 3605
- The mixture controller of a carburettor: varies the fuel supply to the main discharge nozzle.
- 12155
- In a multi-spool turbofan engine. the fan is driven by: the rearmost turbine.
- 3627
- If a current is passed through a conductor which is positioned in a magnetic field: a force will be exerted on the conductor.
- 2375
- The speed of an asynchronous four-pole motor fed at a frequency of 400 Hertz is: 12000 revolutions per minute.
- 10573
- The systems used for emergency extension of landing systems may comprise: 1. Compressed CO2. 2. Compressed nitrogen. 3. Compressed oxygen. 4. Auxiliaiy hydraulic system. 5. Freefall. The combination containing all of the correct statements is: 2, 4, 5.
- 759
- Shuttle valves will automatically: Switch hydraulically operated units to the most appropriate pressure supply.
- 3623
- When two DC generators are operating in parallel, control of load sharing is achieved by: an equalising circuit which, in conjunction with the voltage regulators, varies the field excitation current of the generators.
- 12083
- Regarding the oxygen system of a JAR 25 aeroplane: with the setting on 'NORMAL', the crew breathes a mixture of oxygen and cabin air.
- 10744
- The most common material used in the construction of gearbox casings is: Magnesium alloy.
- 10742
- The frequency which corresponds to a wavelength of 12 cm is: 2500 MHz.
- 829
- During re-fuelling the automatic shut-off valves will switch off the fuel supply system when: the fuel has reached a predetermined volume or mass.
- 12305
- The use of too low an octane fuel may cause: detonation.
- 3613
- For a turbine engine, the term self-sustaining speed relates to the speed at which the engine: will run without any external assistance.
- 3693
- Assuming cabin pressure decreases, the cabin rate of climb indicator should indicate: a rate of climb.
- 5410
- Associate the correct legend to each of the numbered diagrams : 1- cantilever 2- fork 3- halffork 4- dual wheels
- 3636
- Internal leakage in a hydraulic system will cause: an increased fluid temperature.
- 2028
- When the pilot moves the mixture lever of a piston engine towards a lean position the: amount of fuel entering the combustion chamber is reduced.
- 1239
- In a compressor stage of a jet engine, the sequence is: rotor- stator
- 3145
- A radio signal looses strength as range from the transmitter increases, this is called: attenuation
- 2985
- At constant fuel flow, if engine compressor air is bled off for engine anti-icing or a similar system, the turbine temperature: will rise.
- 12095
- On most transport aircraft, the low pressure pumps of the fuel system are: Centrifugal pumps.
- 12522
- Whilst in level cruising flight, an aeroplane with a pressurised cabin experiences a malfunction of the pressure controller. If the cabin rate of climb indicator reads -200ftimin: the differential pressure will rise to its maximum value, thus causing the safety relief valves to open.
- 2031
- Maximum exhaust gas temperature (EGT) of a piston engine is theoretically associated with a: fuel to air ratio of 1:15.
- 10540
- The cylinder head and oil temperatures may exceed their normal operating ranges if: a lower octane rating than specified for the engine is used.
- 10492
- If, when the magneto selector switch is set to the OFF position, a piston engine continues to run normally. the most probable cause is that: The grounding wire on a magneto is broken.
- 3439
- Connecting two 12 volt 40 ampere-hour capacity batteries in series will result in a total voltage and capacity respectively of: 24 volts, 40 ampere-hours.
- 4786
- The disadvantages of a chemical oxygen source for the passenger cabin are 1. a flow which cannot be modulated,: 2. a heavy and bulky system,: 3. non reversible functioning,: 4. risks of explosion,: 5. poor autonomy.: The combination regrouping all the correct statements is: 1, 3, 5
- 754
- In hydraulic systems of large modem transport category aircraft the fluids used are: Synthetic oil.
- 10550
- The inner surface of a heated windscreen is of: Soft polycarbonate.
- 10503
- In the event of an engine fire: The fuel supply is isolated from the engine by a pilot controlled fuel shut off valve.
- 2019
- When TAS increases, the blade angle of a constant speed propeller will (RPM and throttle levers are not moved): increase.
- 10452
- Cockpit indications associated with a windscreen heating system usually comprise: A green system 'ON' information light and an amber system failure light
- 12010
- The cylinder head and oil temperatures may exceed their normal operating ranges if: a lower octane rating than specified for the engine is used.
- 12003
- The thermal efficiency of a gas turbine engine will increase with a: decrease in ambient air temperature.
- 14180
- The correct order of decreasing freezing points of the three mentioned fuels is :Jet A, Jet A-1. Jet El
- 10450
- Cabin air for a large aeroplane during night: is temperature controlled.
- 10753
- When the AC generators are connected in parallel, the reactive loads are balanced by means of the: energizing current
- 428
- The pack cooling fan provides: cooling air to the primary and secondary heat exchanger during slowflight and ground operation.
- 2408
- A magnetic circuit-breaker is: a protection system that has a quick tripping response.
- 12052
- Severe compressor stall can be indicated amongst others by: a rise in turbine gas temperature (101) and a change in vibration level.
- 4229
- The type of a aircraft oxygen system intended for use by passengers, is mostly: a continuous flow system
- 4204
- On-board electrical systems are protected against faults of the following type:; 1. AC generator over-voltage: 2. AC generator under-voltage: 3. over-current; 4. over-speed: 5. under-frequency; 6. undue vibration of AC generators: The combination of correct statements is : 1,2.3,4,5
- 5382
- When in night, a piston engine is stopped and the propeller blade angle is near 90°. the propeller is said to be: feathered.
- 3639
- 'Nose wheel shimmy' may be described as: a possibly damaging vibration of the nose wheel when moving on the ground.
- 5406
- The reservoirs of a hydraulic system can be pressurized: by bleed air from the engine.
- 5383
- During a power change on an engine equipped with a constant speed propeller, a wrong combination of manifold pressure and RPM values results in excessive pressures in the cylinders. This is the case when one simultaneously selects a ... high manifold pressure and low RPM.
- 10751
- To reverse the direction of rotation of a shunt-type (parallel field) DC electric motor, it is necessary to: reverse the polarity of either the stator or the rotor.
- 10502
- In some aircraft, there is a protection device to avoid the landing gear being inadvertently retracted on the ground. It consists of: A latch located in the landing gear lever.
- 3065
- The built-in passenger oxygen system be activated by: switching the passenger oxygen ON.
- 12017
- Both gas turbine and piston engines utilise a cycle of induction, compression, combustion and exhaust. However in the gas turbine these processes are (i) and combustion occurs at (ii)Respectively (i) and (ii) are:
- 14178
- The function of a vibrator in some gas turbine ignition systems is to provide:ADC current to the transformer to facilate the generation of a higher voltage to the ignition
- 831
- The purpose of the barometric correction in a fuel controller is to: maintain the correct fuel to air mass ratio when the altitude increases.
- 12004
- The selection of bleed air to 'ON' will cause: a decrease in power and an increase in exhaust temperature.
- 2979
- In a gas turbine engine. the maximum gas temperature is attained: within the combustion chamber.
- 14114
- At Reference. The smoke detection in the aircraft cargo compartments is carried out by four sensors: C1, C2, C3 and C4.; They are associated with the logic circuit as described in the annex. The repeating bell is activated when:the Cl and C2 sensors detect smoke.;
- 3440
- When a conductor cuts the flux of a magnetic field: an electromotive force (EMF) is induced in the conductor.
- 2882
- The reason for using inverters in an electrical system is .. To change DC into AC.
- 3434
- The logic symbol shown represents (assuming positive logic) : an INVERT or NOT gate.
- 3651
- lithe ground wire between the magneto and the ignition switch becomes disconnected, the most noticeable result will be that the engine cannot be shut down by turning the switch to the OFF position.
- 12239
- To achieve reverse thrust on a turbine engine with a high by-pass ratio, it is necessary to: deflect the fan thrust.
- 12018
- The purpose of the pack cooling fans in the air conditioning system is to: supply the heat exchangers with cooling air during slowflights and ground operation.
- 3047
- Tail safe construction' is: A type of construction in which the load is carried by other components if a part of the structure fails.
- 3067
- The useful work area in an ideal Otto engine indicator diagram is enclosed by the following gas state change lines 2 adiabatic and 2 isochoric lines.
- 3464
- The frequency of an AC generator is dependent on the: number of pairs of poles and the speed of the moving part.
- 707
- The wavelength of a radio transmitted on frequency 121.95 MHz is: 2.46 m
- 12034
- The fuel cross-feed system enables: the supply of any engine from any fuel tank
- 2891
- The fuel system boost pumps are used to: avoid the bubbles accumulation and feed the lines with fuel for directing it to the engine at a positive pressure.
- 12029
- The correct statement about rain protection for cockpit windshields is that: rain repellent should never be sprayed onto the windshield unless the rainfall is very heavy.
- 3628
- The moving part in an AC generator is usually referred to as the: rotor.
- 10546
- Aircraft fuel tanks should be checked for water: before the first flight of the day.
- 4785
- The advantages of a chemical oxygen source for the passenger cabin are 1. reduced weight and volume,: 2. easy storage and maintenance,: 3. greater autonomy,: 4. no risk of explosion,: 5. reversible functioning,: 6. no maintenance.; The combination regrouping all the correct statements is: 1, 2, 4, 6
- 1246
- When a part of a continuous loop fire detection system is heated: 1. its resistance decreases. 2. its resistance increases. 3. the leakage current increases. 4. the leakage current decreases. The combination regrouping all the correct statements 1,3
- 776
- The purpose of baffles in an aeroplane's integral fuel tank is to: restrict the fuel movements in the tank.
- 10595
- When a continuous loop wire type fire detection system is tested: the wiring and the warning are tested.
- 3453
- 'Frequency wild' in relation to a AC generation system means the generator: output frequency varies with engine speed.
- 12279
- To avoid the risk of tyre burst from overheating there is: a thermal plug that deflates the tyre at a specific temperature.
- 12313
- The power required for field excitation of the main rotor in modem constant-frequency alternators is directly controlled by: the voltage regulator.
- 1313
- The accessory units driven by the accessory gearbox of a turbo-jet engine are the: 1. thrust reverser pneumatic motors 2. AC generator and its constant speed drive (CSD) 3. oil pumps 4. hydraulic pumps 5. high pressure fuel pumps The combination regrouping all the correct statements is : 2, 3, 4, 5.
- 2405
- The auxiliary power unit (APU) has its own AC generator that: supplies the aircraft with three-phase 115-200 V, 400 Hz AC.
- 14176
- A turbofan engine with an inlet air mass flow of 1000 kg's and a bypass mass flow of 889 kg's has a bypass ratio of:8.01
- 12110
- 'Vapour lock' is the phenomenon by which: heat produces vapour bubbles in the fuel line.
- 3137
- An asymmetric loading (p-factor) on the propeller exists .. If the aeroplane has a large angle of attack.
- 3650
- If an engine fails to stop with the magneto switch in OFF position, the cause may be: excessive carbon formation in cylinder head.
- 10538
- The birnetal strip detectors of an engine fire detection system: 1 - are arranged in series. 2 - are arranged in parallel. 3 - open during a fire. 4 - close during a fire. The combination containing all of the correct statements is: 2 and 4 only.
- 2025
- Variations in mixture ratios for carburettors are achieved by the adjustment of: fuel flow.
- 12078
- A smoke hood is a device covering: the whole head and with a continuous oxygen flow.
- 2457
- The type of windings commonly used in DC starter motors are: series wound.
- 12008
- The reason for a double switch on the elevator trim is: to reduce the probability of a trim runaway.
- 12150
- In an air cycle machine: the turbine drives the compressor of the machine which causes a higher temperature. and so increases the second heat exchanger efficiency.
- 2871
- The damping element in a landing gear shock absorber used on large aircraft is: Oil.
- 3510
- Fixed-pitch propellers are usually designed for maximum efficiency at: cruising speed
- 3497
- On the flight deck, an oil operated constant speed drive (CSD) is normally provided with means of monitoring the: oil over-temperature and low oil pressure.
- 12528
- When starting the engine, or when the engine is running at idle rpm on the ground, the mixture is: rich, to make starling possible and to cool the engine sufficiently when idling.
- 424
- In large modern aircraft, in the air conditioning system, reduction of air temperature and pressure is achieved by: an expansion turbine.
- 12014
- Cabin pressurisation is regulated by the: cabin outflow valve(s).
- 3135
- What will happen to the geometrical pitch angle of a 'constant speed propeller' if the manifold pressure is increased ? It will increase
- 10569
- The contents of an oxygen bottle can be ensure by the: 1 - weight. 2 - pressure. 3 - level. 4 - volume. The combination containing all of the correct statements is: 1 and 2 only.
- 1241
- The most common extinguishing agent used in gas turbine engine fire protection system is: Freon.
- 3645
- An impulse coupling does not function at such speeds above those encountered in starting. Its engaging pawls are prevented from operating at higher speeds by centrifugal force
- 5389
- The resistors R1 and R2 are connected in parallel. The value of the equivalent resistance (Req) so obtained is given by the following formula: 1/Req =1/R1 + 11R2
- 12079
- One of the purposes of compressor bleed valves is to: decrease the airflow across the rear compressor stages, whilst that across the early stages is increased.
- 771
- The fuel supply system on a jet engine includes a fuel heating device, upstream of the main fuel filter so as to: prevent, at low fuel temperature, the risk of ice formation from water contained in the fuel.
- 12038
- As altitude increases, if the mixture is not leaned: both the density of air entering the carburettor and the fuel flow decrease.
- 3516
- The operating principle of float-type carburettors is based on the: difference in air pressure at the venturi throat and the air inlet
- 12123
- lithe ground wire between the magnetos and the ignition switch becomes disconnected the most noticeable result will be that: the engine cannot be shut down by turning the ignition switch to the 'OFF' position.
- 3451
- When AC generators are operated in parallel, they must be of the same: voltage and frequency.
- 2874
- The component that converts hydraulic pressure into linear motion is called: An actuator or jack.
- 3803
- Prolonged running at low rpm can have an adverse effect on the functioning of the: spark plugs.
- 5373
- Evacuation slide inflation is ensured by: a pressurized gas canister combined with the slide itself.
- 12015
- Cabin air forJAR 25 aeroplanes is usually taken from: the high pressure compressor.
- 3069
- The power output of a piston engine can be calculated by: Torque times RPM.
- 3083
- if the maximum operating pressure of the oxygen system is exceeded the: oxygen is discharged overboard via a safety plug.
- 12016
- By-pass ratio in a turbine engine is the ratio of the: cold air mass flow to the hot air mass flow.
- 12080
- On design purpose, the relationship between the fuel octane rating and the maximum compression ratio of a piston engine is: the higher the octane rating is, the higher the maximum compression ratio is
- 12145
- In hydraulic system, a shuttle valve: enables an alternate system to operate the same actuators in case of normal system failure.
- 12156
- In a jet engine the propelling nozzle: must be designed to obtain the correct balance of pressure and velocity to preventflow separation.
- 1972
- In a fire detection system with single-loop continuous components (with no fault protection), if the line is accidentally grounded: the fire alarm is triggered.
- 12062
- Assume an initial condition at a high cruise altitude with a constant speed propeller. What will happen if the altitude is decreased while the throttle remains fully open and the waste gate is seized in the cruise position: The manifold absolute pressure (MAP) value may exceed the maximum allowed value.
- 757
- In a hydraulic system. the reservoir is pressurized in order to: prevent pump cavitation