2A652 (Age Journeyman) Volume 4, Edit Code 6
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(602) When should starting aids be used to start the New Generation Heater (NGH)?
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When the temperature gauge reads COOL.
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Never, as it will result in serious engine damage.
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When ambient temperature is below 32 degrees Fahrenheit (°F).
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During the engine start up with the ignition switch in PREHEAT position.
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In the air force it is important for the equipment used by the pilots and soldiers to be properly maintained. This is done by someone with proper knowledge of the ground equipments. The quiz below will take you through volume four and help you in your revision. Give it a shot.
Quiz Preview
- 2.
(606) Which MA–3D air conditioner control switch allows the operator to control the overall volume of air leaving the unit?
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Blower.
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Airflow.
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Evaporator.
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Temperature.
Correct Answer
A. Airflow.Explanation
The MA-3D air conditioner control switch that allows the operator to control the overall volume of air leaving the unit is the Airflow switch. This switch enables the operator to adjust the speed or intensity of the blower, thus controlling the amount of air being circulated by the air conditioner. The Evaporator and Temperature switches are not specifically designed for controlling the overall volume of air, while the Blower switch is related to the operation of the airflow but does not directly control the overall volume.Rate this question:
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- 3.
(616) At which storage cylinder pressure, in pounds per square inch gauge (psig), should the self generating nitrogen servicing cart (SGNSC) nitrogen booster compressor stop?
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2,400.
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4,100.
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4,400.
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6,400.
Correct Answer
A. 4,400.Explanation
The self-generating nitrogen servicing cart (SGNSC) nitrogen booster compressor should stop at a storage cylinder pressure of 4,400 pounds per square inch gauge (psig).Rate this question:
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- 4.
(624) During the MJ–1B bomblift operational check, all hydraulic components should exhibit
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A smooth movement with no binding or no jumping.
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Fast steady movements with minimal jumping.
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Some settling once the actuator is released.
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Small amounts of residue.
Correct Answer
A. A smooth movement with no binding or no jumping.Explanation
During the MJ-1B bomblift operational check, it is important that all hydraulic components exhibit a smooth movement with no binding or jumping. This means that there should be no resistance or jerking motion when the components are being operated. This ensures that the bomblift is functioning properly and can safely lift and transport bombs. Any binding or jumping could indicate a malfunction or potential failure in the hydraulic system, which could be dangerous during operations. Therefore, it is crucial to ensure a smooth movement without any binding or jumping for the safety and effectiveness of the bomblift.Rate this question:
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- 5.
(626) When verifying the proper operation of the MHU–83C/E bomblift centering mechanism, the unit should
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Start in reverse.
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Move in neutral.
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Not start in reverse.
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Not move in neutral.
Correct Answer
A. Not move in neutral.Explanation
The correct answer is not move in neutral. When verifying the proper operation of the MHU-83C/E bomblift centering mechanism, the unit should not move in neutral. This means that the centering mechanism should remain stationary when the unit is in neutral position. This is important for ensuring the safety and stability of the bomblift during operation. If the centering mechanism moves in neutral, it could indicate a malfunction or issue with the unit, which would need to be addressed before further use.Rate this question:
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- 6.
(626) Check the MHU–83C/E bomblift backup hydraulic system by
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Closing the shutoff valve.
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Operating the hand pump.
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Closing the air bleed valve.
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Operating the system pump.
Correct Answer
A. Operating the hand pump.Explanation
The correct answer is operating the hand pump. This is because the backup hydraulic system of the MHU-83C/E bomblift can be checked by manually operating the hand pump. The hand pump is used to manually generate hydraulic pressure in case the main system fails or is not available. By operating the hand pump, the operator can ensure that the backup system is functional and ready to be used if needed.Rate this question:
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- 7.
(628) If a bomblift starter failed to operate, which step should be taken first?
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Replace the starter.
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Check the starter cables.
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Remove and replace the battery.
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Check the battery terminals and posts.
Correct Answer
A. Check the battery terminals and posts.Explanation
The first step to take if a bomblift starter fails to operate is to check the battery terminals and posts. This is because loose or corroded connections can prevent the starter from receiving the necessary power to operate. By checking and ensuring that the battery terminals and posts are clean and securely connected, any issues related to the power supply can be identified and resolved. This step should be taken before considering replacing the starter, checking the starter cables, or removing and replacing the battery.Rate this question:
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- 8.
(628) When troubleshooting the MJ–1B bomblift electrical system, which component will give you a visual indication that the alternator is charging the batteries?
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Ammeter.
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Voltmeter.
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Bright head lights.
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Control panel light.
Correct Answer
A. Ammeter.Explanation
The ammeter is a component that measures the flow of current in the electrical system. If the alternator is charging the batteries, it will cause an increase in the current flowing through the system, which will be indicated by the ammeter. Therefore, the ammeter will give a visual indication that the alternator is charging the batteries.Rate this question:
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- 9.
(630) Which must be done prior to raising or lowering the mast from the vertical or horizontal position on the FL–1D floodlight set?
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Secure all doors.
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Warm-up the engine.
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Set the master control switch to ON.
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Position the tow bar to the left or right.
Correct Answer
A. Position the tow bar to the left or right. -
- 10.
(631) Where can you find test procedures for a particular component on a FL–1D floodlight set?
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Unit manufacturer’s technical order (TO).
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Periodic inspection workcards.
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Service inspection workcards.
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Illustrated parts breakdown.
Correct Answer
A. Unit manufacturer’s technical order (TO).Explanation
The correct answer is the unit manufacturer's technical order (TO). This is because the TO provides detailed instructions and procedures for the installation, operation, and maintenance of a specific unit or component. It includes step-by-step instructions on how to conduct tests and inspections, ensuring that the floodlight set is functioning properly. The periodic inspection workcards and service inspection workcards may provide some guidance on inspections but may not have specific procedures for testing a particular component. The illustrated parts breakdown provides information on the individual parts of the floodlight set but does not include test procedures.Rate this question:
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- 11.
(637) Which must be done before lowering the ram on the B–6 tripod jack?
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Tighten the ram lock nut.
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Loosen the ram lock nut.
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Close the relief valve.
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Close the air vent.
Correct Answer
A. Loosen the ram lock nut.Explanation
Before lowering the ram on the B-6 tripod jack, it is necessary to loosen the ram lock nut. This is because the ram lock nut secures the ram in place, and loosening it allows the ram to move freely and lower down. Tightening the ram lock nut would keep the ram in a fixed position and prevent it from lowering. Closing the relief valve and air vent are not relevant to the process of lowering the ram on the tripod jack.Rate this question:
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- 12.
(638) Which component on the B–1 adjustable aircraft maintenance platform allows the work platform and steps to remain parallel to the base at any desired platform height?
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Base assembly.
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Upper platform.
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Stair support linkage.
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Hydraulic cylinder assembly.
Correct Answer
A. Stair support linkage.Explanation
The stair support linkage is the component on the B-1 adjustable aircraft maintenance platform that allows the work platform and steps to remain parallel to the base at any desired platform height. This linkage system is responsible for maintaining the alignment and stability of the platform and steps, ensuring the safety and ease of use for maintenance personnel.Rate this question:
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- 13.
(638) Which type of mechanism does the B–4 adjustable aircraft maintenance platform use to raise and lower the platform?
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Screw.
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Scissor.
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Ratchet.
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Pneumatic.
Correct Answer
A. Scissor.Explanation
The B-4 adjustable aircraft maintenance platform uses a scissor mechanism to raise and lower the platform. This type of mechanism consists of two crossed beams that pivot at the center, allowing the platform to be raised or lowered by extending or retracting the beams. The scissor mechanism provides stability and strength, making it suitable for supporting heavy loads such as aircraft during maintenance operations.Rate this question:
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- 14.
(642) The chain hoist on the universal jack tester is operated by
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Pressure from the jack.
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Beam assembly.
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A control box.
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Load cell.
Correct Answer
A. A control box.Explanation
The chain hoist on the universal jack tester is operated by a control box. This means that the control box is responsible for controlling the movement and operation of the chain hoist. It is likely that the control box contains the necessary controls and mechanisms to control the lifting and lowering of the chain hoist, making it an essential component in the operation of the universal jack tester.Rate this question:
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- 15.
(638) The B–4 adjustable aircraft maintenance platform can attain heights of a minimum of
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3 feet to a maximum of 15 feet.
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3 feet to a maximum of 7 feet.
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2 feet to a maximum of 12 feet.
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2 feet to a maximum of 5 feet.
Correct Answer
A. 3 feet to a maximum of 7 feet.Explanation
The correct answer is 3 feet to a maximum of 7 feet. This means that the B-4 adjustable aircraft maintenance platform can be adjusted to reach a height of at least 3 feet and up to a maximum of 7 feet.Rate this question:
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- 16.
(610) Which must be accomplished to avoid damage prior to operating the ACE 802S air conditioner in the HEATING mode after COOLING mode operation?
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Permit refrigerant pressure to equalize.
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Perform maximum refrigerant pump down.
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Place heating/cooling switch in HEATING position.
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Place the reversing valve lever in the HEATING position.
Correct Answer
A. Permit refrigerant pressure to equalize.Explanation
To avoid damage prior to operating the ACE 802S air conditioner in the HEATING mode after COOLING mode operation, it is necessary to permit refrigerant pressure to equalize. This is important because the refrigerant pressure needs to stabilize and equalize before switching between modes to prevent any sudden changes in pressure that could potentially damage the system.Rate this question:
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- 17.
(624) As soon as the MJ–1B engine starts, check for sufficient
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Hydraulic pressure.
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Battery charging.
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Fuel pressure.
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Oil pressure.
Correct Answer
A. Oil pressure.Explanation
When the MJ-1B engine starts, it is important to check for sufficient oil pressure. Oil pressure is crucial for lubricating the engine's moving parts and ensuring their smooth operation. Without adequate oil pressure, the engine may experience excessive wear and damage, leading to potential failure. Therefore, it is essential to monitor the oil pressure as soon as the engine starts to ensure its proper functioning.Rate this question:
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- 18.
(606) Refrigerant leaving the evaporator coil, in the MA–3D air conditioner, is a
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Low-pressure gas.
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High-pressure gas.
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Low-pressure liquid.
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High-pressure liquid.
Correct Answer
A. Low-pressure gas.Explanation
In the MA-3D air conditioner, the refrigerant leaving the evaporator coil is in a low-pressure gas state. This is because the evaporator coil is responsible for absorbing heat from the surrounding air, causing the refrigerant to evaporate and turn into a gas. As a gas, the refrigerant has low pressure, which allows it to flow easily through the system and continue the cooling process.Rate this question:
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- 19.
(606) When starting the MA–3D air conditioner, hold the safety override switch until
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30 pounds of oil pressure is reached on the engine oil pressure gauge.
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The start switch is released.
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The engine warms up.
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The engine starts.
Correct Answer
A. 30 pounds of oil pressure is reached on the engine oil pressure gauge.Explanation
When starting the MA-3D air conditioner, it is necessary to hold the safety override switch until 30 pounds of oil pressure is reached on the engine oil pressure gauge. This is important because the air conditioner relies on the engine oil pressure to function properly. Once the oil pressure reaches the required level, it indicates that the engine is running smoothly and can provide the necessary power for the air conditioner to operate effectively. Releasing the start switch or waiting for the engine to warm up or start are not relevant to ensuring the proper functioning of the air conditioner.Rate this question:
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- 20.
(611) How can a restriction in a refrigerant system be identified?
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Sweating at the outlet of a component.
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Frosting at the outlet of a component.
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Abnormal compressor noise.
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Increased suction pressure. Please
Correct Answer
A. Frosting at the outlet of a component.Explanation
Frosting at the outlet of a component can be an indication of a restriction in a refrigerant system. When there is a restriction, the flow of refrigerant is hindered, causing a decrease in pressure and temperature. This can lead to the formation of frost on the component's outlet as the refrigerant expands and cools rapidly. Therefore, observing frosting at the outlet of a component can help identify a restriction in the refrigerant system.Rate this question:
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- 21.
(614) Which position should the vent valve be in when liquid oxygen (LOX) carts are being transported?
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Tow.
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Closed.
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Opened.
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Transport.
Correct Answer
A. Closed.Explanation
The vent valve should be in the closed position when liquid oxygen (LOX) carts are being transported. This is because liquid oxygen is highly volatile and can easily evaporate into a gas. Keeping the vent valve closed prevents any leakage or loss of oxygen during transportation, ensuring the safety and integrity of the LOX carts.Rate this question:
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- 22.
(616) To start the self generating nitrogen servicing cart (SGNSC), the operator places the ignition switch in the start position for no more than how many seconds?
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5.
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10.
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15.
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20.
Correct Answer
A. 10.Explanation
To start the self-generating nitrogen servicing cart (SGNSC), the operator should place the ignition switch in the start position for no more than 10 seconds. This time limit ensures that the cart's engine is given enough time to start without causing any damage or unnecessary wear. Placing the ignition switch in the start position for a longer duration may result in issues such as overheating or draining the battery. Therefore, it is important for the operator to adhere to the recommended time limit of 10 seconds.Rate this question:
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- 23.
(619) The purpose of the low pressure pump on the MJ–2A–1 is to ensure a constant flow of fluid to the
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Relief valves.
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Aircraft pumps.
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Low pressure filters.
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High pressure pump.
Correct Answer
A. High pressure pump.Explanation
The purpose of the low pressure pump on the MJ-2A-1 is to ensure a constant flow of fluid to the high pressure pump. The high pressure pump requires a continuous supply of fluid to operate effectively and efficiently. The low pressure pump helps to maintain a consistent flow of fluid to the high pressure pump, ensuring that it can deliver the necessary pressure for various aircraft systems. This helps to maintain the overall performance and functionality of the high pressure pump and the aircraft systems it supports.Rate this question:
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- 24.
(623) Continuous movement of pressurized hydraulic fluid in the MJ–1B bomblift causes the fluid to become
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Cooled.
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Heated.
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Compressed.
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Contaminated.
Correct Answer
A. Heated.Explanation
The continuous movement of pressurized hydraulic fluid in the MJ-1B bomblift causes friction, which generates heat. This heat causes the fluid to become heated.Rate this question:
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- 25.
(629) The engine safety circuits on the FL–1D floodlight set shutdown the engine by
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Opening the fuel solenoid.
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Closing the engine intake air.
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Shutting off fuel to the engine.
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Tripping the protective circuit breaker.
Correct Answer
A. Shutting off fuel to the engine.Explanation
The engine safety circuits on the FL-1D floodlight set shutdown the engine by shutting off fuel to the engine. This means that when the engine safety circuits detect a problem or a dangerous situation, they will stop the flow of fuel to the engine, effectively shutting it down. This is a common safety measure in engines to prevent accidents or further damage in case of emergencies.Rate this question:
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- 26.
(641) When servicing the hydraulic cart, which prevents large particles in the fluid from entering the reservoir?
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Line filter.
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Check valve.
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Mesh screen.
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Relief valve.
Correct Answer
A. Mesh screen.Explanation
When servicing the hydraulic cart, a mesh screen is used to prevent large particles in the fluid from entering the reservoir. The mesh screen acts as a filter, allowing only smaller particles and clean fluid to pass through while trapping and preventing larger particles from entering the reservoir. This helps to maintain the cleanliness and integrity of the hydraulic system, preventing potential damage or blockages caused by large particles in the fluid.Rate this question:
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- 27.
(639) Which section of the MD–1 towbar has a screw actuated fork assembly that is used to engage or disengage the aircraft nose gear?
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Head adapter assembly.
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Main tube assembly.
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Extension tubes.
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Lift actuator.
Correct Answer
A. Head adapter assembly.Explanation
The head adapter assembly of the MD-1 towbar has a screw actuated fork assembly that is used to engage or disengage the aircraft nose gear. This means that the head adapter assembly is responsible for connecting the towbar to the nose gear of the aircraft, allowing it to be towed. The screw actuated fork assembly ensures a secure engagement and disengagement of the nose gear, providing stability and control during towing operations.Rate this question:
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- 28.
(639) The purpose of the lift mechanism on the MD–1 tow bar is to
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Adjust the forks.
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Stabilize the main tube assembly.
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Raise and lower the wheel assemblies.
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Engage or disengage the aircraft nose gear.
Correct Answer
A. Raise and lower the wheel assemblies.Explanation
The purpose of the lift mechanism on the MD-1 tow bar is to raise and lower the wheel assemblies. This means that the lift mechanism is responsible for lifting the wheels of the aircraft off the ground or lowering them back onto the ground as needed. This is an important function as it allows for easy maneuverability and transportation of the aircraft using the tow bar.Rate this question:
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- 29.
(603) Repair of ground heater equipment should never be attempted
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Without first talking with the operator.
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Without first consulting your supervisor.
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Unless accurate technical data is available.
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Unless in the presence of an experienced mechanic.
Correct Answer
A. Unless accurate technical data is available.Explanation
Repairing ground heater equipment without accurate technical data can be dangerous and may result in further damage or injury. It is important to have the necessary information and instructions before attempting any repairs to ensure the proper procedures are followed. Consulting the operator or supervisor may provide some guidance, but without accurate technical data, the repair should not be attempted.Rate this question:
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- 30.
(604) Heat that can be felt and added or subtracted to a substance without changing its state is called
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Super heat.
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Latent heat.
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Specific heat.
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Sensible heat.
Correct Answer
A. Sensible heat.Explanation
Sensible heat refers to the heat that can be felt and added or subtracted to a substance without changing its state. It is the heat that causes a change in temperature of a substance, without causing it to change from a solid to a liquid or from a liquid to a gas. This type of heat is easily detectable and can be measured using a thermometer. Super heat refers to the heat added to a substance above its boiling point, latent heat refers to the heat absorbed or released during a phase change, and specific heat refers to the amount of heat required to raise the temperature of a substance by a certain amount.Rate this question:
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- 31.
(605) A good refrigerant will
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Operate in moderate to high pressure.
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Operate in low to moderate pressure.
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Be semi-corrosive to metals.
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Have a high boiling point.
Correct Answer
A. Operate in low to moderate pressure.Explanation
A good refrigerant will operate in low to moderate pressure because high pressure can put stress on the system and increase the risk of leaks or damage. Additionally, low to moderate pressure allows for more efficient heat transfer and better performance of the refrigeration system.Rate this question:
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- 32.
(607) Refrigerant is always removed through the
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Purge valve.
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Receiver inlet valve.
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Receiver outlet valve.
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Discharge service valve.
Correct Answer
A. Receiver outlet valve.Explanation
The correct answer is "receiver outlet valve." The receiver is a storage tank in a refrigeration system where the refrigerant is stored. The receiver outlet valve is responsible for controlling the flow of refrigerant out of the receiver. When the system needs to remove refrigerant, it is done through the receiver outlet valve. This valve allows the refrigerant to be directed to the appropriate location in the system, such as the condenser or other components.Rate this question:
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- 33.
(613) Every how many years is the hydrostatic test due on the receiver tank on a MC–20 air compressor?
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9.
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7.
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5.
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3.
Correct Answer
A. 5.Explanation
The correct answer is 5 because the hydrostatic test is due on the receiver tank of a MC-20 air compressor every 5 years.Rate this question:
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- 34.
(617) Which is the proper level in the self generating nitrogen servicing cart (SGNSC) hydraulic reservoir?
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2/3 to 3/4 inch from the bottom of the glass.
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2/3 to 3/4 inch from the top of the glass.
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1/2 inch from the bottom of the glass.
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1/2 inch below the top of the glass.
Correct Answer
A. 1/2 inch below the top of the glass.Explanation
The proper level in the self-generating nitrogen servicing cart (SGNSC) hydraulic reservoir is 1/2 inch below the top of the glass. This means that the hydraulic fluid should be filled up to this level, ensuring that there is enough fluid for proper operation without overfilling the reservoir.Rate this question:
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- 35.
(618) During an operational check of a self-generating nitrogen servicing cart (SGNSC) the engine is running at 3,000 revolutions per minute (rpm), but the nitrogen purity does not reach 95.5 percent within 30 minutes. Which is a probable cause of this malfunction?
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Warming door is not lowered for cold weather operating conditions.
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Low oil level in the feed air compressor lubricant separator tank.
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Booster compressor defective.
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Poor air ventilation.
Correct Answer
A. Warming door is not lowered for cold weather operating conditions.Explanation
The warming door is responsible for maintaining the temperature inside the self-generating nitrogen servicing cart (SGNSC) during cold weather operating conditions. If the warming door is not lowered, it can result in lower temperatures inside the cart, which can affect the nitrogen purity. This is because colder temperatures can cause condensation and freezing of moisture, which can contaminate the nitrogen and lower its purity. Therefore, the probable cause of the malfunction is the warming door not being lowered for cold weather operating conditions.Rate this question:
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- 36.
(619) Which position must the reservoir selector valve be in when filling and bleeding the MJ–2A–1 hydraulic test stand hydraulic system?
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OPEN.
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STAND.
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AIRCRAFT.
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EXTERNAL.
Correct Answer
A. AIRCRAFT.Explanation
The reservoir selector valve must be in the AIRCRAFT position when filling and bleeding the hydraulic system of the MJ-2A-1 hydraulic test stand. This position allows the hydraulic fluid to be drawn from the aircraft's hydraulic system, ensuring that the test stand is properly filled and bled.Rate this question:
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- 37.
(620) Which MJ–2A–1 hydraulic test stand switch provides an alternate means of energizing the fill pump when either of the micro switches are defective?
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Fill switch, LS4.
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Fill master switch.
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Fill micro switch, FS1.
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Fill to start relay switch.
Correct Answer
A. Fill switch, LS4.Explanation
The correct answer is Fill switch, LS4. This switch provides an alternate means of energizing the fill pump when either of the micro switches are defective. It serves as a backup switch to ensure that the fill pump can still be activated even if the micro switches fail.Rate this question:
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- 38.
(623) Which MJ–1B bomblift valve prevents collapsing of the cantilever lifting arms in the event of hydraulic pressure failure?
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Air bleed.
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Rotary by-pass.
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Counterbalance.
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Over pressurization.
Correct Answer
A. Counterbalance.Explanation
The counterbalance valve prevents collapsing of the cantilever lifting arms in the event of hydraulic pressure failure. It is designed to provide a controlled flow of fluid from the rod side of the cylinder to the cap side, allowing the arms to lower smoothly and safely in case of pressure loss. This valve helps maintain stability and prevents sudden drops or collapses, ensuring the safety of the bomblift system.Rate this question:
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- 39.
(623) Which valve is used to slowly raise or lower the MJ–1B bomblift lift arms?
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Lateral control.
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Longitudinal control.
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Cradle lift arm control.
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Control panel lift arm control.
Correct Answer
A. Cradle lift arm control.Explanation
The cradle lift arm control valve is used to slowly raise or lower the MJ-1B bomblift lift arms. This valve allows for precise control and adjustment of the lift arms, ensuring smooth and accurate movement. It is specifically designed for controlling the lift arms of the bomblift and is the most suitable option for this purpose.Rate this question:
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- 40.
(628) The most obvious and easiest way of isolating most hydraulic malfunctions is to look for
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Slow operation.
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Erratic operation.
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Fluid under the unit.
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Movement when the control valve is not actuated.
Correct Answer
A. Fluid under the unit.Explanation
Fluid under the unit is the most obvious and easiest way of isolating most hydraulic malfunctions. This is because if there is fluid leaking under the unit, it indicates a problem with the hydraulic system. Leaks can occur due to damaged hoses, seals, or fittings, and they can cause a loss of hydraulic pressure and affect the operation of the system. Therefore, identifying fluid under the unit can help pinpoint the source of the malfunction and allow for necessary repairs to be made.Rate this question:
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- 41.
(631) When a FL–1D floodlight set comes in with a write-up, how do you verify a malfunction exists?
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Operate the unit.
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Analyze the problem.
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Perform a service inspection.
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Give several probable causes.
Correct Answer
A. Operate the unit.Explanation
To verify a malfunction in a FL-1D floodlight set, the best course of action is to operate the unit. By turning on the floodlight and observing its performance, any issues or malfunctions can be identified. This method allows for a direct assessment of the unit's functionality and can help in determining the specific problem that needs to be addressed. Analyzing the problem, performing a service inspection, and giving probable causes can be done after operating the unit to further diagnose and troubleshoot the malfunction.Rate this question:
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- 42.
(608) Which A/M32C–10D air conditioner component extracts energy from bleed air on the air cycle machine?
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Compressor.
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Heat exchanger.
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Expansion turbine.
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Temperature controller.
Correct Answer
A. Expansion turbine.Explanation
The expansion turbine is the component of the A/M32C-10D air conditioner that extracts energy from bleed air on the air cycle machine. This turbine is responsible for expanding the high-pressure air from the compressor and converting its energy into mechanical work. This work is then used to drive the air cycle machine and provide cooling to the aircraft. The expansion turbine plays a crucial role in the overall functioning of the air conditioner system by extracting energy from the bleed air and using it to cool the aircraft's cabin.Rate this question:
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- 43.
(604) Heat added to a gas is
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Sensible heat.
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Specific heat.
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Super heat.
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Latent heat.
Correct Answer
A. Super heat.Explanation
When heat is added to a gas and its temperature increases above its boiling point, it is referred to as superheat. Superheating occurs when a substance is heated beyond its boiling point without changing its state from a gas to a liquid. This additional heat energy increases the kinetic energy of the gas molecules, causing them to move faster and increase in temperature. Sensible heat refers to the heat added or removed from a substance resulting in a change in temperature, specific heat is the amount of heat required to raise the temperature of a substance by a certain amount, and latent heat refers to the heat added or removed during a phase change, such as from a liquid to a gas.Rate this question:
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- 44.
(612) On a basic rotary compressor, which prevents air from leaving the discharge port while the intake port is taking air in?
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Sliding barrier.
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Rotating barrier.
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Discharge valve.
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Stationary barrier.
Correct Answer
A. Sliding barrier.Explanation
A basic rotary compressor uses a sliding barrier to prevent air from leaving the discharge port while the intake port is taking air in. The sliding barrier acts as a seal between the two ports, ensuring that the compressed air flows in the desired direction and does not escape prematurely. This mechanism helps maintain the efficiency and effectiveness of the compressor by controlling the air flow and preventing any loss of pressure.Rate this question:
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- 45.
(612) Oil in a rotary vane compressor
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Lubricates the connecting rods.
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Has high viscosity and is very inflammable.
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Forms a seal between the vanes and the stator.
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Permits it to be classified as a high pressure unit.
Correct Answer
A. Forms a seal between the vanes and the stator.Explanation
The correct answer is "forms a seal between the vanes and the stator." In a rotary vane compressor, oil is used to create a seal between the vanes and the stator. This seal is necessary to prevent leakage of compressed air and to ensure efficient operation of the compressor. The oil fills the gaps between the vanes and the stator, creating a barrier that allows the vanes to move smoothly and maintain a tight seal. Without this oil, the compressor would not be able to generate the necessary pressure and efficiency would be compromised.Rate this question:
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- 46.
(613) The MC–20 air compressor provides which kind of air for pneumatic tools and tire inflation?
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High pressure.
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Low pressure.
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High volume.
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Low volume.
Correct Answer
A. Low pressure.Explanation
The MC-20 air compressor provides low pressure air for pneumatic tools and tire inflation. This means that it produces air at a lower pressure level, which is suitable for tasks that require less force and precision. Low pressure air is commonly used for inflating tires, as well as operating various pneumatic tools such as nail guns and paint sprayers.Rate this question:
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- 47.
(615) How is the air compressor in the self generating nitrogen servicing cart (SGNSC) categorized?
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High-pressure.
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Low-pressure.
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High volume.
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Low volume.
Correct Answer
A. High-pressure.Explanation
The air compressor in the self-generating nitrogen servicing cart (SGNSC) is categorized as high-pressure. This means that it is capable of producing air at a high pressure level, which is necessary for certain applications such as filling high-pressure nitrogen cylinders or servicing aircraft systems that require high-pressure air.Rate this question:
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- 48.
(620) Which MJ–2A–1 hydraulic test stand engine system safety device sounds the warning horn in the event of an engine system malfunction?
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Water level switch.
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Oil pressure switch.
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Fuel level indicator.
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Fuel pressure switch.
Correct Answer
A. Oil pressure switch.Explanation
The oil pressure switch is the correct answer because it is a safety device in the MJ-2A-1 hydraulic test stand engine system that sounds the warning horn when there is a malfunction in the engine system. This switch monitors the oil pressure and triggers the horn to alert the operator if the pressure drops below a certain level, indicating a potential problem with the engine. The other options, such as the water level switch, fuel level indicator, and fuel pressure switch, are not directly related to monitoring engine system malfunctions or sounding warning horns.Rate this question:
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- 49.
(621) Which valve must be opened when setting up the MJ–2A–1 hydraulic test stand controls for operation?
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Return system bypass.
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Compensator control.
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Supply shut-off.
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System selector.
Correct Answer
A. Return system bypass.Explanation
When setting up the MJ-2A-1 hydraulic test stand controls for operation, the valve that must be opened is the return system bypass. This valve allows the hydraulic fluid to bypass the system and return directly to the reservoir. By opening this valve, any excess pressure in the system can be relieved, ensuring safe and efficient operation of the test stand controls.Rate this question:
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Current Version
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Mar 22, 2023Quiz Edited by
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Jun 01, 2017Quiz Created by
Ronnie
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