2A656 CDC Vol 5
Multiple Choice
Questions and Answers
- 1.
(801) 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.
Correct Answer
B. Expel the agent from the bottle.Explanation
The gaseous nitrogen charge is added to the liquid fire extinguishing agent in order to expel the agent from the bottle. When the fire extinguisher is activated, the nitrogen gas pressurizes the liquid, forcing it out of the bottle and onto the fire. This helps to quickly and effectively extinguish the fire by rapidly dispersing the agent onto the flames.Rate this question:
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- 2.
(801) 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.
Correct Answer
B. To break cleanly into large pieces.Explanation
The frangible disc in a liquid-agent fire extinguisher container is undercut into pie-shaped sections to break cleanly into large pieces. This design allows for easier and more effective dispersal of the extinguishing agent when the disc is broken. Breaking cleanly into large pieces ensures that the agent can flow freely without any obstructions or clogging, allowing for efficient firefighting.Rate this question:
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- 3.
(802) The purpose of a time delay relay that is used on some liquid-agent fire extinguishing systems is to
- A.
Position the valves.
- B.
Select the fire bottle bank.
- C.
Prime the explosive cartridge.
- D.
Prevent discharging of the agent.
Correct Answer
A. Position the valves.Explanation
The purpose of a time delay relay used on liquid-agent fire extinguishing systems is to position the valves. This means that the time delay relay controls the timing of when the valves open or close, allowing the liquid-agent fire extinguishing system to activate and discharge the agent at the appropriate time. This ensures that the system is properly synchronized and ready to effectively extinguish a fire.Rate this question:
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- 4.
(802) 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.
Engine selector.
- B.
Agent discharge.
- C.
Time delay relay.
- D.
Discharge selector.
Correct Answer
D. Discharge selector.Explanation
The most probable cause of the malfunction is a faulty discharge selector switch. In a two-shot liquid-agent fire extinguishing system, BANK no. 1 discharged normally, indicating that the agent discharge and time delay relay are functioning properly. Since BANK no. 2 failed to discharge, it suggests that there is an issue with the switch responsible for selecting the discharge of the liquid agent.Rate this question:
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- 5.
(802) A flashing red light on the fire emergency control T-handle indicates
- A.
An open fuel valve.
- B.
Closed air valves.
- C.
An overheat condition.
- D.
A fire.
Correct Answer
C. An overheat condition.Explanation
A flashing red light on the fire emergency control T-handle indicates an overheat condition. This means that there is a high temperature or excessive heat in the system, which could potentially lead to a fire or other hazardous situation. The flashing red light serves as a warning signal to alert the operator or user to take immediate action and address the overheat condition to prevent any further damage or danger. It is important to promptly respond to this warning and follow appropriate safety protocols to ensure the safety of the equipment and individuals involved.Rate this question:
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- 6.
(802) When depressed, which switch on a T-handle fire extinguishing system completes the circuit to the squib?
- A.
Time delay relay switch.
- B.
Agent discharge switch.
- C.
Engine selector switch.
- D.
Bottle selector switch.
Correct Answer
D. Bottle selector switch.Explanation
The bottle selector switch is the correct answer because it completes the circuit to the squib when depressed. The bottle selector switch is responsible for selecting the specific fire extinguishing agent bottle that will be discharged when activated. When the switch is depressed, it completes the circuit, allowing the electrical current to flow and activate the squib, which in turn initiates the discharge of the fire extinguishing agent from the selected bottle.Rate this question:
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- 7.
(802) In the T-handle fire extinguishing system, the two-way check valve is pushed into position by the
- A.
Liquid agent.
- B.
Discharge valve.
- C.
Agent discharge switch.
- D.
Gaseous nitrogen charge.
Correct Answer
A. Liquid agent.Explanation
In the T-handle fire extinguishing system, the two-way check valve is pushed into position by the liquid agent. This means that the liquid agent, which is the substance used to extinguish the fire, applies pressure on the check valve, causing it to move into position. The other options, such as the discharge valve, agent discharge switch, and gaseous nitrogen charge, do not play a role in pushing the check valve into position. Therefore, the correct answer is liquid agent.Rate this question:
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- 8.
(803) How does a liquid coolant system keep electronic components cool?
- A.
Cycles coolant through the electronic component.
- B.
Cycles conditioned air through the electronic component.
- C.
Directs coolant across the electronic component.
- D.
Directs conditioned air across the electronic component.
Correct Answer
A. Cycles coolant through the electronic component.Explanation
A liquid coolant system keeps electronic components cool by cycling coolant through the electronic component. This means that the coolant is continuously circulated through the electronic component, absorbing heat as it passes through and carrying it away. This process helps to dissipate the heat generated by the electronic component, preventing it from overheating and potentially damaging the component.Rate this question:
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- 9.
(803) 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.
Metallic content.
- D.
Nonconductance.
Correct Answer
D. Nonconductance.Explanation
The characteristic of nonconductance in the fluid used in a liquid coolant system makes it suitable as a coolant for electronic components. Nonconductance means that the fluid does not conduct electricity, which is important when cooling electronic components to prevent any electrical interference or damage. By using a nonconducting coolant, the risk of short circuits or electrical malfunctions is minimized, ensuring the safe and efficient cooling of the electronic components.Rate this question:
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- 10.
(803) 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 rapid cool down.
- C.
Allow for system stabilization.
- D.
Provide rapid pressure buildup.
Correct Answer
C. Allow for system stabilization.Explanation
The purpose of energizing the solenoid shutoff valve closed for three minutes during the initial start of a liquid coolant system is to allow for system stabilization. This means that the valve closure helps in achieving a steady and balanced state within the system, ensuring that all components are properly functioning and ready for operation. This action helps prevent any potential issues or malfunctions that may arise due to unstable conditions within the system.Rate this question:
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- 11.
(803) 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
Correct Answer
A. Thermal pilot valveExplanation
The thermal pilot valve is positioned by the temperature of the coolant in a liquid coolant system. This valve is designed to open or close based on the temperature of the coolant, allowing for proper regulation of the system. It helps to maintain the desired temperature and prevent overheating or undercooling of the system.Rate this question:
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- 12.
(803) 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
Correct Answer
D. A mechanical pop-up indicator is activatedExplanation
When the liquid coolant filter in a liquid coolant system becomes dirty, a mechanical pop-up indicator is activated. This indicator serves as a visual signal to alert the user that the filter needs to be cleaned or replaced. The activation of this indicator allows for timely maintenance of the filter, preventing any potential damage or malfunction in the system.Rate this question:
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- 13.
(803) What components control the temperature of the coolant in a liquid coolant system?
- A.
Pump and heat exchanger
- B.
Pump and thermal pilot valve
- C.
Thermal modulating valve and heat exchanger
- D.
Thermal modulating valve and thermal pilot valve
Correct Answer
D. Thermal modulating valve and thermal pilot valveExplanation
The temperature of the coolant in a liquid coolant system is controlled by the thermal modulating valve and the thermal pilot valve. These valves regulate the flow of coolant and adjust the amount of heat transferred between the coolant and the heat exchanger. By modulating the valves, the system can maintain a desired coolant temperature by either increasing or decreasing the flow of coolant or adjusting the heat transfer rate. The pump is responsible for circulating the coolant, while the heat exchanger facilitates the transfer of heat between the coolant and the surrounding environment.Rate this question:
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- 14.
(804) When maintaining a liquid coolant system, over-torquing clamps may cause what to happen?
- A.
Leakage of the component.
- B.
Contamination of the component.
- C.
Damage or failure of the component.
- D.
Nothing happens.
Correct Answer
C. Damage or failure of the component.Explanation
Over-torquing clamps in a liquid coolant system can cause damage or failure of the component. This is because excessive torque can put excessive pressure on the component, leading to cracks, leaks, or even complete failure. It is important to properly tighten clamps within the recommended torque range to ensure the integrity and functionality of the coolant system.Rate this question:
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- 15.
(804) 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
Correct Answer
C. Prevent air from entering the systemExplanation
Purging the servicing unit supply hose is done to prevent air from entering the system. Air in the coolant system can cause problems such as reduced cooling efficiency and air pockets that can lead to overheating. By purging the hose, any air trapped in it is removed, ensuring that only coolant flows into the system. This helps maintain the proper functioning of the coolant system and prevents potential issues caused by air bubbles.Rate this question:
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- 16.
(805) Why are multiplace liferaft cylinders wire-wound and dip-soldered?
- A.
Decreases metal fatigue
- B.
Adds strength to the cylinder
- C.
Decreases cylinder expansion
- D.
Increases cylinder corrosion resistance
Correct Answer
B. Adds strength to the cylinderExplanation
Wire-winding and dip-soldering are used in multiplace liferaft cylinders to add strength to the cylinder. This process helps to reinforce the cylinder structure, making it more robust and resistant to external forces. By adding strength, the cylinder is better equipped to withstand the harsh conditions it may encounter during its use, such as rough seas or impact. This ensures the reliability and durability of the liferaft, ultimately enhancing its effectiveness in emergency situations.Rate this question:
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- 17.
(805) 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
Correct Answer
B. NitrogenExplanation
Nitrogen is used as the charge in the inflation cylinder of a multiplace liferaft to ensure that it will inflate in extremely low temperatures. Nitrogen is an inert gas that is less reactive and more stable compared to other gases like air, hydrogen, and carbon dioxide. It has a lower risk of combustion or explosion, making it a safer option for use in liferafts. Additionally, nitrogen has a lower freezing point than air, hydrogen, and carbon dioxide, allowing it to remain in a gaseous state even in very cold temperatures.Rate this question:
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- 18.
(805) 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
Correct Answer
D. Discharge valveExplanation
The discharge valve is the component of a liferaft inflation cylinder assembly that keeps carbon dioxide (CO2) within the cylinder and permits an unrestricted flow of CO2 to the liferaft. It is responsible for releasing the CO2 gas from the cylinder into the liferaft, allowing it to inflate properly.Rate this question:
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- 19.
(805) 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
Correct Answer
A. Cam -
- 20.
(806) How many pounds of carbon dioxide (CO2) does a fully charged shipping/storage cylinder contain?
- A.
25
- B.
50
- C.
75
- D.
100
Correct Answer
B. 50Explanation
A fully charged shipping/storage cylinder contains 50 pounds of carbon dioxide (CO2).Rate this question:
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- 21.
(806) 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
Correct Answer
C. Hydrostatic testingExplanation
Liferaft inflation cylinders with small dimensions do not need hydrostatic testing. Hydrostatic testing is a process used to test the structural integrity of pressure vessels by subjecting them to high-pressure water to check for any leaks or weaknesses. However, since the inflation cylinders in question are small, with a diameter of less than 2 inches and a length of less than 2 feet, they are exempt from this testing requirement.Rate this question:
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