Electrical and Environmental
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- A gaseous nitrogen charge is added to a liquid fire extinguishing agent in order to:
- Expel agent from bottle.
- What component holds both a liquid agent and a nitrogen agent in a liquid-agent fire extinguisher container?
- frangible disc
- In a liquid-agent fire extinguisher container, why is the frangible disc undercut into shaped sections?
- To break cleanly into large pieces.
- What is the purpose of a time delay relay that is used on some liquid-agent fire extinguishing systems?
- To position valves.
- BANK no. 2 in a two-shot liquid-agent fire extinguishing system failed to discharge, while BANK no. 1 discharged normally. The MOST probably cause of this malfunction is what type of faulty switch?
- Time delay relay
- When depressed, which switch on a T-handle fire extinguishing system completes the circuit to the squib?
- Agent discharge switch.
- In the T-handle fire extinquishing system, the two-way check valve is pushed into position by the..
- Liquid agent.
- In a T-handle liquid-agent fire extinguishing system, what happens when the container pressure becomes too low?
- A pressure switch closes.
- Air that is trapped in a coolant system has what effect?
- Reduces the cooling capability of the coolant.
- During initial start of a liquid coolant system, the controller timer energizes the solenoid shutoff valve closed for 3 minutes. The purpose of this action is to..
- allow for system stabilization.
- What component ofa liquid coolant system is positioned by the temperature of the coolant?
- Thermal pilot valve.
- In a liquid coolant system, what tells you that the liquid coolant filter is dirty?
- A mechanical pop-up indicator is activated.
- When maintaining a liquid coolant system, over-torquing clamps may cause what to happen?
- Damage or failure of teh component.
- IN a liquid coolant system, what is the purpose of purging the servicing unit supply hose?
- Remove contaminants from the system.
- To ensure that a multiplace liferaft will inflate in extremely low temperatures, the inflation cylinder has a charge of...
- Nitrogen.
- What component of a liferaft inflation cylinder assembly keeps carbon dioxide (CO2) within the cylinder and permits an unrestricted flow of CO2 to the liferaft?
- Discharge valve.
- Releasing carbon dioxide (CO2)from a liferaft cylinderinto a liferaft is normally done by activating the..
- cam.
- What action do you take if you find corrosion on the inside of a liferaft inflation cylinder?
- Tag the cylinder for overhaul.
- Liferaft inflation cylinders having an outside diameter of less than 2inches and a length of less than 2 feet do NOT require..
- Hydrostatic testing.
- After recharging a liferaft inflation cylinder-but before returning it to serviceable status-what do you do to the cylinder?
- Test for leaks, then reweigh after 48 hours.