Electrical And Environmental Volume 5 2A656

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  • 1/68 Questions

    (801) A gaseous nitrogen (N2) charge is added to a liquid fire extinguishing agent in order to

    • Convert the liquid to a gas upon discharge.
    • Expel the agent from the bottle.
    • Assist in extinguishing the fire.
    • Stabilize the temperature.
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About This Quiz

This quiz, titled 'electrical and environmental volume 5 2A656', assesses knowledge on the operation and troubleshooting of fire extinguishing systems. It covers mechanisms like nitrogen charges in liquid fire extinguishers, function of frangible discs, and system malfunctions. Essential for professionals in fire safety and emergency response.

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  • 2. 

    (803) What characteristic of the fluid used in a liquid coolant system makes it suitable as a coolant for electronic components?

    • Viscosity.

    • Resistance.

    • Metallic content.

    • Nonconductance.

    Correct Answer
    A. Nonconductance.
    Explanation
    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, which is important in preventing any electrical short circuits or damage to the electronic components.

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  • 3. 

    (803) In a liquid coolant system, what tells you that the liquid coolant filter is dirty?

    • The system shuts down.

    • A warning light flashes.

    • A warning horn alarm is activated.

    • A mechanical pop-up indicator is activated.

    Correct Answer
    A. A mechanical pop-up indicator is activated.
    Explanation
    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 the operator that the filter needs to be cleaned or replaced. The activation of the pop-up indicator allows for timely maintenance and prevents any potential damage or malfunction in the system.

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  • 4. 

    (808) Oxygen in its natural state is

    • Colorless, tasteless, and odorless.

    • Colorless, tasteless, and weightless.

    • Odorless, massless, and volumeless.

    • Odorless, massless, and weightless.

    Correct Answer
    A. Colorless, tasteless, and odorless.
    Explanation
    Oxygen in its natural state is colorless, tasteless, and odorless. This means that it does not have any color, it does not have any taste, and it does not have any odor.

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  • 5. 

    (808) Supply and distribution tubing for aircraft oxygen systems is identified by cellulose tape in what colors?

    • Black and red.

    • Blue and yellow.

    • Green and white.

    • Brown and orange.

    Correct Answer
    A. Green and white.
    Explanation
    Supply and distribution tubing for aircraft oxygen systems is identified by cellulose tape in green and white colors.

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  • 6. 

    (801) In a liquid-agent fire extinguisher container, why is the frangible disc undercut into pie shaped sections?

    • To break easily.

    • To break cleanly into large pieces.

    • To stop the pieces from clogging the strainer.

    • To enable the pieces to pass easily through the strainer.

    Correct Answer
    A. 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 easy and effective dispersal of the liquid agent when the disc is broken. Breaking cleanly into large pieces ensures that the liquid agent is released in a controlled manner, without any small fragments that could potentially clog the strainer or impede the flow of the agent.

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  • 7. 

    (805) Why are multiplace liferaft cylinders wire-wound and dip-soldered?

    • Decreases metal fatigue.

    • Adds strength to the cylinder.

    • Decreases cylinder expansion.

    • Increases cylinder corrosion resistance.

    Correct Answer
    A. Adds strength to the cylinder.
    Explanation
    Multiplace liferaft cylinders are wire-wound and dip-soldered to add strength to the cylinder. This process helps to reinforce the cylinder and make it more durable. By wire-winding and dip-soldering, the cylinder becomes stronger and less susceptible to damage or failure. This is important for liferafts as they need to withstand rough conditions and maintain their integrity to ensure the safety of the occupants.

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  • 8. 

    (809) Which one of these is a disadvantage of a continuous-flow oxygen regulator?

    • It wastes oxygen.

    • It is unusable below 10,000 feet.

    • It is usable only above 20,000 feet.

    • It delivers oxygen at varying pressures.

    Correct Answer
    A. It wastes oxygen.
    Explanation
    A continuous-flow oxygen regulator wastes oxygen because it delivers a constant flow of oxygen regardless of whether the user is inhaling or exhaling. This means that oxygen is being constantly supplied even when it is not needed, resulting in wastage of oxygen.

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  • 9. 

    (805) To ensure that a multiplace liferaft will inflate in extremely low temperatures, the inflation cylinder has a charge of

    • Air.

    • Nitrogen.

    • Hydrogen.

    • Carbon dioxide.

    Correct Answer
    A. Nitrogen.
    Explanation
    The correct answer is nitrogen. Nitrogen is used to inflate the inflation cylinder of a multiplace liferaft in extremely low temperatures because it remains a gas at low temperatures and does not freeze or become solid like other gases such as air, hydrogen, or carbon dioxide. This ensures that the liferaft will inflate properly and be ready for use in emergency situations, even in extremely cold environments.

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  • 10. 

    (807) After recharging a liferaft inflation cylinder—but before returning it to serviceable status—

    • Repaint, then reweigh after 24 hours.

    • Repaint, then reweigh after 48 hours.

    • Test for leaks, then reweigh after 24 hours.

    • Test for leaks, then reweigh after 48 hours.

    Correct Answer
    A. Test for leaks, then reweigh after 24 hours.
    Explanation
    After recharging a liferaft inflation cylinder, it is necessary to test for leaks before returning it to serviceable status. This ensures that the cylinder is functioning properly and does not have any leaks that could compromise its ability to inflate the liferaft. After the leak test, the cylinder should be reweighed after 24 hours to ensure that it is holding the correct amount of gas and is ready for use.

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  • 11. 

    (812) How do you loosen a B-nut from a fitting on the tubing of an oxygen regulator?

    • Hold the fitting with a wrench to prevent twisting of the tubing.

    • Hold the oxygen tubing by hand and allow the fitting to turn.

    • Apply anti-seize tape to the flare-end fitting threads.

    • Apply an approved lubricant to ease loosening of the B-nut.

    Correct Answer
    A. Hold the fitting with a wrench to prevent twisting of the tubing.
    Explanation
    When loosening a B-nut from a fitting on the tubing of an oxygen regulator, it is important to hold the fitting with a wrench to prevent twisting of the tubing. This is necessary because if the tubing twists, it can cause damage or leaks, which can be dangerous when working with oxygen. By holding the fitting with a wrench, it ensures that only the B-nut is being loosened, while the tubing remains stable and secure.

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  • 12. 

    (822) What is the minimum safe distance when servicing or maintenance is being performed on the nitrogen servicing unit?

    • 30 feet.

    • 40 feet.

    • 50 feet.

    • 60 feet.

    Correct Answer
    A. 50 feet.
    Explanation
    When servicing or maintenance is being performed on the nitrogen servicing unit, the minimum safe distance is 50 feet. This distance ensures the safety of the personnel involved by keeping them at a safe distance from any potential hazards or accidents that may occur during the servicing or maintenance process.

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  • 13. 

    (804) When maintaining a liquid coolant system, over-torquing clamps may cause what to happen?

    • Leakage of the component.

    • Contamination of the component.

    • Damage or failure of the component.

    • Nothing happens.

    Correct Answer
    A. 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 lead to the deformation or cracking of the component, compromising its integrity and functionality. It is important to apply the correct amount of torque when tightening clamps to prevent such damage and ensure the proper functioning of the coolant system.

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  • 14. 

    During an inspection of a cryotainer, you find a faulty pressure gage. What action should you take?

    • Condemn the gage.

    • Compare the gage with another gage.

    • Send the gage to TMDE for calibration.

    • Adjust the gage after you complete the inspection.

    Correct Answer
    A. Send the gage to TMDE for calibration.
    Explanation
    The correct action to take when finding a faulty pressure gauge during an inspection of a cryotainer is to send the gauge to TMDE (Test, Measurement, and Diagnostic Equipment) for calibration. This is because calibration is necessary to ensure that the gauge is accurate and reliable. By sending it to TMDE, professionals can assess and adjust the gauge as needed to ensure its proper functioning.

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  • 15. 

    (802) A flashing red light on the fire emergency control T-handle indicates

    • An open fuel valve.

    • Closed air valves.

    • An overheat condition.

    • D. a fire.

    Correct Answer
    A. An overheat condition.
    Explanation
    A flashing red light on the fire emergency control T-handle indicates an overheat condition. This means that there is excessive heat in the system, which could potentially lead to a fire. It is important to address this situation immediately to prevent any further damage or danger.

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  • 16. 

    (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

    • Prevent pressure surges.

    • Allow for rapid cool down.

    • Allow for system stabilization.

    • Provide rapid pressure buildup.

    Correct Answer
    A. Allow for system stabilization.
    Explanation
    During the initial start of a liquid coolant system, the controller timer energizes the solenoid shutoff valve closed for three minutes. This action allows for system stabilization. By closing the valve, it restricts the flow of coolant, allowing the system to reach a steady state and stabilize before full operation. This helps to prevent pressure surges and ensures that the system is functioning properly before normal operation begins.

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  • 17. 

    (806) Liferaft inflation cylinders having an outside diameter of less than 2 inches and a length of less than 2 feet do not require

    • Stenciling

    • Recharging

    • Hydrostatic testing.

    • Corrosion treatment.

    Correct Answer
    A. Hydrostatic testing.
    Explanation
    Liferaft inflation cylinders with small dimensions do not need to undergo hydrostatic testing. Hydrostatic testing is a process that checks the integrity of pressure vessels by subjecting them to high-pressure water to ensure they can withstand the specified pressure. Since the inflation cylinders in question are small and have specific dimensions, they are exempt from this testing requirement.

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  • 18. 

    (808) Which part of the body usually suffers first from the effects of hypoxia?

    • Ears.

    • Eyes

    • Nose

    • Lungs

    Correct Answer
    A. Eyes
    Explanation
    The eyes usually suffer first from the effects of hypoxia because they have a high oxygen demand and are very sensitive to changes in oxygen levels. Hypoxia can cause blurry vision, difficulty focusing, and even vision loss in severe cases. The lack of oxygen can damage the delicate tissues of the eyes, leading to various eye problems.

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  • 19. 

    (813) On a gaseous oxygen servicing trailer, what does the purifier assembly remove from gaseous oxygen?

    • Odors.

    • Nitrogen.

    • Moisture.

    • Carbon dioxide

    Correct Answer
    A. Moisture.
    Explanation
    The purifier assembly on a gaseous oxygen servicing trailer removes moisture from the gaseous oxygen.

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  • 20. 

    7. (802) In the T-handle fire extinguishing system, the two-way check valve is pushed into position by the

    • Liquid agent.

    • Discharge valve.

    • Agent discharge switch.

    • 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 when the liquid agent is released from the system, it exerts pressure on the check valve, causing it to move into the correct position. The liquid agent plays a crucial role in ensuring that the check valve functions properly and allows for the effective discharge of the extinguishing agent.

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  • 21. 

    (808) What does the molecular sieve oxygen generating system (MSOGS) concentrator supply to the OXYGEN regulator control panel?

    • Nitrogen.

    • 16 man-minutes of oxygen.

    • 93 percent oxygen-enriched gas.

    • 100 percent oxygen-enriched gas.

    Correct Answer
    A. 93 percent oxygen-enriched gas.
    Explanation
    The molecular sieve oxygen generating system (MSOGS) concentrator supplies the OXYGEN regulator control panel with 93 percent oxygen-enriched gas.

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  • 22. 

    (812) Which statement best describes the proper use of anti-seize tape in an oxygen system?

    • Use on flared fittings.

    • Apply only when a leak is suspected.

    • Use on all fittings through which liquid oxygen flows.

    • Apply a small amount on the first three threads of a pipe thread fitting.

    Correct Answer
    A. Apply a small amount on the first three threads of a pipe thread fitting.
    Explanation
    Anti-seize tape should be applied on the first three threads of a pipe thread fitting in an oxygen system. This helps to prevent galling and seizing of the threads, ensuring a proper seal and easy disassembly in the future. It is not necessary to use anti-seize tape on flared fittings, all fittings through which liquid oxygen flows, or only when a leak is suspected.

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  • 23. 

    (818) Which reference contains procedures for cleaning oxygen components?

    • 15X–1–1.

    • 1–1A–14.

    • 1–1A–15.

    • 8–1–1.

    Correct Answer
    A. 15X–1–1.
    Explanation
    The correct answer is 15X-1-1. This reference contains procedures for cleaning oxygen components.

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  • 24. 

    (802) The purpose of a time delay relay that is used on some liquid-agent fire extinguishing systems is to

    • Position the valves.

    • Select the fire bottle bank.

    • Prime the explosive cartridge.

    • 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 relay is responsible for controlling the opening and closing of the valves at the appropriate time, allowing the liquid agent to be released and extinguish the fire effectively. The time delay ensures that the valves are activated at the right moment, providing a controlled and timed response to the fire emergency.

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  • 25. 

    (803) How does a liquid coolant system keep electronic components cool?

    • Cycles coolant through the electronic component.

    • Cycles conditioned air through the electronic component.

    • Directs coolant across the electronic component.

    • 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 flowing through the component, absorbing heat and carrying it away. This process helps to maintain a stable temperature and prevent the electronic component from overheating.

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  • 26. 

    (805) Releasing carbon dioxide (CO2) from a liferaft cylinder into a liferaft is normally done by activating the

    • Cam.

    • Rupture disc.

    • Locking sleeve.

    • Check valve seat.

    Correct Answer
    A. Cam.
    Explanation
    Releasing carbon dioxide (CO2) from a liferaft cylinder into a liferaft is typically done by activating the cam. The cam is a mechanical device that controls the movement of other parts in the liferaft system. By activating the cam, it triggers the release of CO2 from the cylinder, allowing it to fill the liferaft and provide buoyancy. The other options, rupture disc, locking sleeve, and check valve seat, are not directly involved in the process of releasing CO2 from the cylinder.

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  • 27. 

    (809) Liquid oxygen converts to gaseous oxygen at an expansion ratio of

    • 600 to 1.

    • 680 to 1.

    • 800 to 1.

    • 860 to 1.

    Correct Answer
    A. 860 to 1.
    Explanation
    Liquid oxygen converts to gaseous oxygen at an expansion ratio of 860 to 1. This means that when liquid oxygen expands, its volume increases 860 times. This expansion ratio is a measure of how much the substance expands when changing from a liquid to a gas state. It indicates the significant increase in volume that occurs during this phase change.

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  • 28. 

    (811) The minimum required clearance between oxygen system tubing and aircraft control cables is

    • 1 inch.

    • 2 inches.

    • 3 inches.

    • 4 inches.

    Correct Answer
    A. 2 inches.
    Explanation
    The minimum required clearance between oxygen system tubing and aircraft control cables is 2 inches. This clearance is necessary to ensure that there is no interference or contact between the tubing and the control cables, which could potentially lead to damage or malfunction of the aircraft's systems. A clearance of 2 inches provides an adequate buffer to prevent any potential issues and allows for safe operation of the aircraft.

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  • 29. 

    (821) While transferring liquid oxygen from an oxygen storage and transfer cart to an aircraft oxygen converter, you note the rate of transfer is very slow. What would cause this malfunction?

    • Excessive boiloff.

    • Low tank pressure.

    • Settling of the perlite.

    • Leaking vacuum valve.

    Correct Answer
    A. Low tank pressure.
    Explanation
    The correct answer is low tank pressure. This means that the oxygen storage tank does not have enough pressure to properly transfer the liquid oxygen to the aircraft oxygen converter. This could be due to a variety of reasons such as a malfunctioning pressure regulator or a decrease in pressure over time.

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  • 30. 

    (803) What components control the temperature of the coolant in a liquid coolant system?

    • Pump and heat exchanger.

    • Pump and thermal pilot valve.

    • Thermal modulating valve and heat exchanger.

    • Thermal modulating valve and thermal pilot valve.

    Correct Answer
    A. Thermal modulating valve and thermal pilot valve.
    Explanation
    The components that control the temperature of the coolant in a liquid coolant system are the thermal modulating valve and the thermal pilot valve. These valves work together to regulate the flow of coolant and adjust its temperature accordingly. The thermal modulating valve controls the flow of coolant, while the thermal pilot valve senses the temperature and signals the modulating valve to adjust accordingly. This ensures that the coolant temperature remains within the desired range.

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  • 31. 

    (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?

    • Diffuser plug.

    • Seating sleeve.

    • Cartridge filter.

    • Discharge valve.

    Correct Answer
    A. Discharge valve.
    Explanation
    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 allows the CO2 to be released from the cylinder and inflate the liferaft when activated. The other options, such as the diffuser plug, seating sleeve, and cartridge filter, do not have the same function of controlling the flow of CO2 and maintaining it within the cylinder.

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  • 32. 

    (813) An aircraft gaseous oxygen system must be purged only with

    • Nitrogen.

    • Liquid oxygen.

    • Gaseous oxygen.

    • Compressed dry air.

    Correct Answer
    A. Gaseous oxygen.
    Explanation
    An aircraft gaseous oxygen system must be purged only with gaseous oxygen because it is the same type of gas that is used in the system. Purging with any other gas, such as nitrogen, liquid oxygen, or compressed dry air, could introduce contaminants or cause damage to the system. Therefore, gaseous oxygen is the correct choice for purging the system to ensure its proper functioning and safety.

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  • 33. 

    (807) What is added to multiplace liferaft inflation cylinders to ensure proper discharge of the carbon dioxide (CO2)?

    • Dry argon.

    • Dry nitrogen.

    • Liquid argon.

    • Liquid nitrogen.

    Correct Answer
    A. Dry nitrogen.
    Explanation
    Dry nitrogen is added to multiplace liferaft inflation cylinders to ensure proper discharge of the carbon dioxide (CO2). This is because dry nitrogen is an inert gas that does not react with other substances, making it suitable for maintaining the pressure and integrity of the CO2 system in the liferaft.

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  • 34. 

    (811) You should replace an oxygen mask-to-regulator connector if the no-go portion of the gono-go gage passes through the

    • Mask connection.

    • Regulator connection.

    • Largest internal port.

    • Smallest internal port.

    Correct Answer
    A. Smallest internal port.
    Explanation
    The correct answer is "smallest internal port." When replacing an oxygen mask-to-regulator connector, the no-go portion of the gono-go gauge should not pass through the smallest internal port. This is because the smallest internal port is a critical component that ensures proper oxygen flow and prevents leaks. If the gauge passes through this port, it indicates that the connector is worn or damaged and needs to be replaced to ensure the safety and effectiveness of the oxygen system.

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  • 35. 

    (816) What control valve on an oxygen storage and transfer unit is closed only during ground transport, head pressure buildup, or the transfer of liquid oxygen?

    • Fill valve.

    • Vent valve.

    • Buildup valve.

    • Vacuum valve.

    Correct Answer
    A. Vent valve.
    Explanation
    The vent valve on an oxygen storage and transfer unit is closed only during ground transport, head pressure buildup, or the transfer of liquid oxygen. This valve is responsible for releasing excess pressure and preventing the buildup of dangerous levels of pressure in the system. By closing the vent valve during specific situations, such as ground transport or when liquid oxygen is being transferred, it ensures the safe operation of the unit and prevents any potential hazards.

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  • 36. 

    (817) What action should you take after determining that a liquid oxygen (LOX) tank valve is leaking through the valve seat?

    • Replace the Nylon seal.

    • Replace the Teflon seal.

    • Repair the Nylon seal.

    • Repair the Teflon seal.

    Correct Answer
    A. Replace the Teflon seal.
    Explanation
    After determining that a liquid oxygen (LOX) tank valve is leaking through the valve seat, the appropriate action to take is to replace the Teflon seal. The Teflon seal is responsible for creating a tight seal between the valve and the valve seat, preventing any leakage. If the seal is damaged or worn out, it needs to be replaced to ensure proper functioning of the valve and to prevent any leaks of the liquid oxygen.

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  • 37. 

    (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?

    • Engine selector.

    • Agent discharge.

    • Time delay relay.

    • Discharge selector.

    Correct Answer
    A. Discharge selector.
    Explanation
    The most probable cause of the malfunction is a faulty discharge selector switch. This switch controls the discharge of the liquid agent in the fire extinguishing system. Since BANK no. 2 failed to discharge while BANK no. 1 discharged normally, it suggests that there is an issue with the switch specifically for BANK no. 2. This could be due to a faulty connection or a malfunctioning switch mechanism.

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  • 38. 

    (812) To reduce vibration and prevent chafing of oxygen system tubing, you should secure long runs of oxygen tubing at least every

    • 2 inches

    • 6 inches

    • 10 inches

    • 15 inches

    Correct Answer
    A. 15 inches
    Explanation
    To reduce vibration and prevent chafing of oxygen system tubing, it is necessary to secure long runs of tubing at regular intervals. The correct answer is 15 inches because securing the tubing at this distance will effectively minimize vibration and prevent chafing. This ensures the safety and proper functioning of the oxygen system.

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  • 39. 

    (813) What is the maximum pressure of compressed air used for cleaning?

    • 20 psi.

    • 30 psi.

    • 40 psi.

    • 50 psi.

    Correct Answer
    A. 30 psi.
    Explanation
    The maximum pressure of compressed air used for cleaning is 30 psi. This pressure is sufficient to effectively clean surfaces without causing damage or injury. Higher pressures can be dangerous and may cause harm to the user or the equipment being cleaned. Lower pressures may not provide enough force to remove dirt and debris effectively. Therefore, 30 psi is the recommended maximum pressure for compressed air cleaning.

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  • 40. 

    (806) How many pounds of carbon dioxide (CO2) does a fully charged shipping/storage cylinder contain?

    • 25

    • 50

    • 75

    • 100

    Correct Answer
    A. 50
    Explanation
    A fully charged shipping/storage cylinder contains 50 pounds of carbon dioxide (CO2).

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  • 41. 

    (814) When performing a high-pressure gaseous oxygen leak test, what minimum amount of time should you wait before taking the second system pressure reading?

    • 6 hours.

    • 12 hours.

    • 18 hours.

    • 24 hours.

    Correct Answer
    A. 24 hours.
    Explanation
    When performing a high-pressure gaseous oxygen leak test, it is necessary to wait a sufficient amount of time before taking the second system pressure reading. This waiting period allows for any potential leaks to be detected and for the system pressure to stabilize. Waiting for 24 hours ensures that enough time has passed for any leaks to become apparent and for an accurate pressure reading to be obtained.

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  • 42. 

    (803) What component of a liquid coolant system is positioned by the temperature of the coolant?

    • Thermal pilot valve.

    • Thermal modulating valve.

    • Delta system bypass valve.

    • Over-pressure relief valve.

    Correct Answer
    A. Thermal pilot valve.
    Explanation
    The component of a liquid coolant system that is positioned by the temperature of the coolant is the thermal pilot valve. This valve is designed to open or close based on the temperature of the coolant, allowing for proper regulation of the coolant flow and temperature within the system.

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  • 43. 

    (809) Which oxygen system allows oxygen to flow automatically to the distribution system when cabin altitude reaches 12,500 feet?

    • Crew system.

    • Troop system.

    • Low-pressure system.

    • High-pressure system.

    Correct Answer
    A. Troop system.
  • 44. 

    (815) What type of test does an oxygen regulator field tester perform?

    • Serviceability.

    • Operational.

    • Functional.

    • Inspection.

    Correct Answer
    A. Operational.
    Explanation
    The correct answer is "Operational." An oxygen regulator field tester is specifically designed to test the operational functionality of an oxygen regulator. This type of test ensures that the regulator is working properly and can effectively regulate the flow of oxygen. It checks if the regulator is able to deliver the correct amount of oxygen and maintain a consistent flow. The tester may simulate various operational conditions to evaluate the performance of the regulator.

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  • 45. 

    (809) If a leak develops in the inner shell of a liquid oxygen container, it will be protected from excessive pressure by the

    • Relief valve.

    • Reducer valve.

    • Blowout disc.

    • Diffuser disc.

    Correct Answer
    A. Blowout disc.
    Explanation
    If a leak develops in the inner shell of a liquid oxygen container, it will be protected from excessive pressure by the blowout disc. A blowout disc is a safety device designed to rupture and release pressure when it exceeds a certain limit. In this case, if there is a leak in the inner shell, the blowout disc will rupture and allow the excess pressure to escape, preventing the container from becoming overpressurized and potentially causing a catastrophic failure.

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  • 46. 

    (809) When the cabin altitude of an aircraft reaches 30,000 feet, what component in the pressure demand oxygen regulator causes 100 percent oxygen to be delivered to the user?

    • Air inlet valve.

    • Demand valve.

    • Diluter aneroid.

    • Pressure breathing aneroid.

    Correct Answer
    A. Diluter aneroid.
    Explanation
    When the cabin altitude of an aircraft reaches 30,000 feet, the diluter aneroid in the pressure demand oxygen regulator causes 100 percent oxygen to be delivered to the user. The diluter aneroid is a component that senses the altitude and adjusts the oxygen flow accordingly. At higher altitudes, the diluter aneroid closes off the diluter ports, allowing only pure oxygen to be delivered to the user. This ensures that the user receives the necessary oxygen concentration to maintain proper oxygenation at high altitudes.

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  • 47. 

    (808) What valve decreases system pressure in a high-pressure oxygen system?

    • Relief valve.

    • Closing valve.

    • Control valve.

    • Reducer valve.

    Correct Answer
    A. Reducer valve.
    Explanation
    The correct answer is "Reducer valve." A reducer valve is used to decrease or regulate the pressure in a high-pressure oxygen system. It is designed to lower the pressure to a safe and manageable level for the system. A relief valve, on the other hand, is used to release excess pressure in a system to prevent damage or failure. Closing valve and control valve are not specifically designed to decrease system pressure.

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  • 48. 

    (809) When the PBG/ON/OFF toggle of an oxygen system is placed in the PBG position, what causes the availability of oxygen and pressure breathing?

    • Negative signal from the pressure-demand valve.

    • Negative signal from the emergency flow valve.

    • Positive signal from the diluter valve.

    • Positive signal from the anti-g valve.

    Correct Answer
    A. Positive signal from the anti-g valve.
    Explanation
    When the PBG/ON/OFF toggle of an oxygen system is placed in the PBG position, the availability of oxygen and pressure breathing is caused by a positive signal from the anti-g valve. This means that the anti-g valve is responsible for allowing the oxygen to flow and maintaining the required pressure for pressure breathing.

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  • 49. 

    39. (810) A liquid oxygen (LOX) system is continuously venting gaseous oxygen overboard. The most probable malfunction is a faulty

    • Buildup coil.

    • Liquid check valve.

    • Pressure closing valve.

    • Quick disconnect coupling.

    Correct Answer
    A. Pressure closing valve.
    Explanation
    The most probable malfunction in a continuously venting liquid oxygen (LOX) system is a faulty pressure closing valve. This valve is responsible for closing off the flow of oxygen when the system reaches a certain pressure. If the valve is faulty, it may not close properly, leading to continuous venting of gaseous oxygen overboard.

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Quiz Review Timeline (Updated): Mar 20, 2023 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 20, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Jul 09, 2011
    Quiz Created by
    Gdobby
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