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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

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