2A656 CDC Volume 5
Electrical/Environmental CDC 2A656 Volume 5
- 1.A gaseous nitrogen (N2) charge is added to a liquid fire extinguishing agent in order to
- A.
Convert the liquid to a gas upon discharge
- B.
Expel the agent from the bottle
- C.
Assist in extinguishing the fire
- D.
Stabilize the temperature
- 2.In a liquid-agent fire extinguisher container, why is the frangible disc undercut into pie shaped sections?
- A.
To break easily
- B.
To break cleanly into large pieces
- C.
To stop the pieces from clogging the strainer
- D.
To enable the pieces to pass easily through the strainer
- 3.The purpose of a time delay relay that is used on some liquid-agent fire extinguishing systems is to
- A.
Prevent discharging of the agent
- B.
Position the valves
- C.
Prime the explosive cartridge
- D.
Select the fire bottle bank
- 4.BANK no. 2 in a two-shot liquid-agent fire extinguishing system failed to discharge, while BANK no. 1 discharged normally. The most probable cause of this malfunction is what type of faulty switch?
- A.
Time delay relay
- B.
Engine selector
- C.
Agent discharge
- D.
Discharge selector
- 5.A flashing red light on the fire emergency control T-handle indicates
- A.
An overheat condition
- B.
An open fuel valve
- C.
Closed air valves
- D.
A fire
- 6.When depressed, which switch on a T-handle fire extinguishing system completes the circuit to the squib?
- A.
Engine selector switch
- B.
Bottle selector switch
- C.
Agent discharge switch
- D.
Time delay relay switch
- 7.In the T-handle fire exinguishing system, the two-way check valve is pushed into position by the
- A.
Gaseous nitrogen charge
- B.
Agent discharge switch
- C.
Discharge valve
- D.
Liquid agent
- 8.How does a liquid coolant system keep electronic components cool?
- A.
Cycles conditioned air through the electronic component
- B.
Cycles coolant through the electronic component
- C.
Directs coolant across the electronic component
- D.
Directs conditioned air across the electronic component
- 9.What characteristic of the fluid used in a liquid coolant system makes it suitable as a coolant for electronic components?
- A.
Viscosity
- B.
Resistance
- C.
Nonconductance
- D.
Metallic content
- 10.During initial start of a liquid coolant system, the controller timer energizes the solenoid shutoff valve closed for three minutes. The purpose of this action is to
- A.
Prevent pressure surges
- B.
Allow for system stabiliztion
- C.
Allow for rapid cool down
- D.
Provide rapid pressure buildup
- 11.What component of a liquid coolant system is positioned by the temperature of the coolant?
- A.
Thermal pilot valve
- B.
Thermal modulating valve
- C.
Delta system bypass valve
- D.
Over-pressure relief valve
- 12.In a liquid coolant system, what tells you that the liquid coolant filter is dirty?
- A.
The system shuts down
- B.
A warning light flashes
- C.
A warning horn alarm is activated
- D.
A mechanical pop-up indicator is activated
- 13.What components control the temperature of the coolant in a liquid coolant system?
- A.
Thermal modulating valve and thermal pilot valve
- B.
Thermal modulating valve and heat exchanger
- C.
Pump and thermal pilot valve
- D.
Pump and heat exchanger
- 14.When maintaining a liquid coolant system, over-torquing clamps may causse what to happen?
- A.
Leakage of the component
- B.
Contamination of the component
- C.
Nothing happens
- D.
Damage or failure of the component
- 15.IN a liquid coolant system, what is the purpose of purging the servicing unit supply hose?
- A.
Remove air from the servicing cart
- B.
REmove contaminants from the system
- C.
Prevent air from entering the system
- D.
Prevent moisture from entering the servicing cart
- 16.Why are multiplace liferaft cylinders wire-wound and dip-soldered?
- A.
Adds strength to the cylinder
- B.
Decreases metal fatigue
- C.
Decreases cylinder expansion
- D.
INcreases cylinder corrosion reistance
- 17.To ensure that a multiplace liferaft will inflate in extremely low temperatures, the inflation cylinder has a charge of
- A.
Air
- B.
Nitrogen
- C.
Hydrogen
- D.
Carbon dioxide
- 18.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?
- A.
Diffuser plug
- B.
Seating sleeve
- C.
Cartridge filter
- D.
Discharge valve
- 19.Releasing carbon dioxide (CO2) from a liferaft cylinder into a liferaft is normally done by activating the
- A.
Cam
- B.
Rupture disc
- C.
Locking sleeve
- D.
Check valve seat
- 20.How many pounds of carbon dioxide (CO2) does a fully charged shipping/storage cylinder contain?
- A.
25
- B.
50
- C.
75
- D.
100
- 21.Liferaft inflation cylinders having an outside diameter of less than 2 inches and a length of less than 2 feet do not require
- A.
Stenciling
- B.
Recharging
- C.
Hydrostatic testing
- D.
Corrosion treatment
- 22.After recharging a liferaft inflation cylinder-but before returning it to a serviceable status-what do you do to the cylinder?
- A.
Repaint, then reweigh after 24 hours
- B.
Repaint, then reweight after 48 hours
- C.
Test for leaks, then reweigh after 24 hours
- D.
Test for leaks, then reweigh after 48 hours
- 23.What is added to multiplace liferaft cylinders to ensure proper discharge of the carbon dioxide (CO2)?
- A.
Dry argon
- B.
Dry nitrogen
- C.
Liquid argon
- D.
Liquid nitrogen
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