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
Correct Answer
B. Expel the agent from the bottleExplanation
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 discharged, the pressure from the nitrogen gas forces the liquid agent out of the bottle and onto the fire. This helps to quickly and effectively extinguish the fire by covering it with the liquid agent.Rate this question:
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- 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
Correct Answer
B. To break cleanly into large piecesExplanation
The frangible disc in a liquid-agent fire extinguisher container is undercut into pie-shaped sections in order to break cleanly into large pieces. This design allows for the easy and efficient release of the extinguishing agent when the disc is broken. Breaking cleanly into large pieces ensures that the agent can flow smoothly and effectively, without any obstruction or clogging. This design feature helps to maintain the functionality of the fire extinguisher and ensures that the agent can be easily dispersed to extinguish the fire.Rate this question:
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- 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
Correct Answer
B. Position the valvesExplanation
The purpose of a time delay relay that is used on some liquid-agent fire extinguishing systems is to position the valves. This means that the relay is responsible for controlling the opening and closing of the valves in the system, allowing the liquid agent to flow when needed and preventing any accidental discharging of the agent. By delaying the activation of the valves, the relay ensures that the system is properly prepared and ready to extinguish the fire when required.Rate this question:
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- 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
Correct Answer
D. Discharge selectorExplanation
The most probable cause of the malfunction is a faulty discharge selector switch. The discharge selector switch is responsible for activating the discharge of the liquid-agent fire extinguishing system. If the switch is faulty, it may fail to activate the discharge of BANK no. 2 while BANK no. 1 discharges normally. This would explain why BANK no. 2 failed to discharge while BANK no. 1 discharged normally.Rate this question:
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- 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
Correct Answer
A. An overheat conditionExplanation
A flashing red light on the fire emergency control T-handle indicates an overheat condition. This means that there is a high temperature in the system, which could potentially lead to a fire if not addressed. It serves as a warning sign for the operator to take immediate action and prevent any further damage or danger.Rate this question:
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- 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
Correct Answer
C. Agent discharge switchExplanation
The agent discharge switch is the correct answer because when depressed, it completes the circuit to the squib in a T-handle fire extinguishing system. This switch is responsible for activating the squib, which releases the fire extinguishing agent. The other options, such as the engine selector switch, bottle selector switch, and time delay relay switch, are not directly involved in completing the circuit to the squib.Rate this question:
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- 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
Correct Answer
D. Liquid agentExplanation
The correct answer is "liquid agent". In a T-handle fire extinguishing system, the two-way check valve is pushed into position by the liquid agent. This means that the liquid agent is responsible for activating the valve and allowing the flow of the extinguishing agent. The gaseous nitrogen charge, agent discharge switch, and discharge valve are not directly involved in pushing the check valve into position.Rate this question:
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- 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
Correct Answer
B. Cycles coolant through the electronic componentExplanation
A liquid coolant system keeps electronic components cool by cycling coolant through the electronic component. This means that the coolant is circulated around the 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 maintaining its optimal operating temperature.Rate this question:
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- 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
Correct Answer
C. NonconductanceExplanation
The characteristic of nonconductance in the fluid used in a liquid coolant system makes it suitable as a coolant for electronic components. This means that the fluid does not conduct electricity, reducing the risk of short circuits or damage to the components. By using a nonconducting coolant, the electronic components can be effectively cooled without any electrical interference or safety hazards.Rate this question:
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- 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
Correct Answer
B. Allow for system stabiliztionExplanation
The initial start of a liquid coolant system can cause pressure surges and instability. By energizing the solenoid shutoff valve closed for three minutes, it allows the system to stabilize before continuing operation. This action helps to prevent pressure surges, allowing for a smoother and more controlled operation of the coolant system.Rate this question:
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- 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
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 and control of the system. It helps maintain the desired temperature by adjusting the flow of coolant as needed.Rate this question:
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- 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
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 is designed to physically pop up or rise when the filter is clogged or dirty, indicating the need for maintenance or replacement. This mechanism provides a visual and tangible signal to the operator or maintenance personnel that the filter needs attention, allowing them to take necessary actions to ensure the proper functioning of the coolant system.Rate this question:
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- 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
Correct Answer
A. 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 thermal pilot valve. These components work together to regulate the flow of coolant and adjust the temperature as needed. The thermal modulating valve controls the flow of coolant based on the temperature, while the thermal pilot valve helps to maintain a consistent temperature by opening or closing based on the temperature readings. Together, these valves ensure that the coolant remains at the desired temperature for optimal system performance.Rate this question:
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- 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
Correct Answer
D. Damage or failure of the componentExplanation
Over-torquing clamps in a liquid coolant system can lead to damage or failure of the component. This is because excessive torque can cause the clamps to exert too much pressure on the component, leading to cracks, fractures, or deformation. This can result in coolant leakage, reduced performance, or complete failure of the component, potentially leading to system malfunction or breakdown. Therefore, it is important to properly tighten clamps within the recommended torque specifications to ensure the integrity and functionality of the coolant system.Rate this question:
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- 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
Correct Answer
C. Prevent air from entering the systemExplanation
Purging the servicing unit supply hose in a liquid coolant system helps prevent air from entering the system. Air bubbles can cause issues such as reduced cooling efficiency and potential damage to the system. By removing air from the hose, the coolant can flow smoothly without any air pockets, ensuring proper cooling and system functionality.Rate this question:
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- 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
Correct Answer
A. Adds strength to the cylinderExplanation
Wire-winding and dip-soldering are used in multiplace liferaft cylinders to add strength to the cylinder. This process involves wrapping wire around the cylinder and then dipping it in solder, which creates a strong and durable bond. This added strength is crucial in liferaft cylinders as they need to withstand extreme conditions and high pressure. Wire-winding and dip-soldering help prevent the cylinder from deforming or bursting, ensuring the safety and reliability of the liferaft in emergency situations.Rate this question:
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- 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
Correct Answer
B. NitrogenExplanation
Nitrogen is used as the charge in the inflation cylinder of a multiplace liferaft to ensure inflation in extremely low temperatures. Nitrogen is an inert gas that does not react with other substances, making it safe and reliable for this purpose. It has a low boiling point and remains in a gaseous state even in very cold conditions, ensuring that the liferaft can inflate properly and provide the necessary buoyancy and support in emergency situations.Rate this question:
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- 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
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. This valve is responsible for controlling the release of the CO2 gas from the cylinder, allowing it to inflate the liferaft effectively in case of an emergency.Rate this question:
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- 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
Correct Answer
A. CamExplanation
In order to release carbon dioxide (CO2) from a liferaft cylinder into a liferaft, the cam needs to be activated. The cam is responsible for controlling the release of CO2 by opening the valve or disc that allows the gas to flow into the liferaft. The other options, rupture disc, locking sleeve, and check valve seat, are not directly involved in the process of releasing CO2 from the cylinder.Rate this question:
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- 20.
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.
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 that are small in size, with an outside diameter of less than 2 inches and a length of less than 2 feet, do not need to undergo hydrostatic testing. Hydrostatic testing is a process used to check the integrity and strength of pressure vessels, such as liferaft inflation cylinders. However, since these small cylinders are unlikely to hold a significant amount of pressure, they are exempt from this testing requirement.Rate this question:
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- 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
Correct Answer
C. Test for leaks, then reweigh after 24 hoursExplanation
After recharging a liferaft inflation cylinder, it is important to test for leaks before returning it to a serviceable status. This ensures that the cylinder is functioning properly and does not have any leaks that could compromise its performance. After testing for leaks, the cylinder should be reweighed after 24 hours to ensure that it has maintained the correct pressure. Repainting is not necessary in this process.Rate this question:
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- 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
Correct Answer
B. Dry nitrogenExplanation
Dry nitrogen is added to multiplace liferaft cylinders to ensure proper discharge of the carbon dioxide (CO2). Nitrogen is used because it is an inert gas, meaning it does not react with other substances. This ensures that the CO2 is discharged effectively without any unwanted reactions or side effects. Additionally, nitrogen is dry to prevent any moisture or condensation from affecting the performance of the liferaft cylinders.Rate this question:
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Current Version
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Mar 20, 2023Quiz Edited by
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Jan 13, 2012Quiz Created by
Bazeigler
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