2a6x2 CDC Vol 4

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  • 1/89 Questions

    Repair of ground heater equipment should never be attempted 

    • Without first talking with the operator
    • Without first consulting your supervisor
    • Unless accurate technical data is available
    • Unless in the presence of an experienced mechanic
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About This Quiz

This quiz titled '2A6X2 CDC VOL 4' focuses on the operational and technical aspects of New Generation Heaters (NGH). It assesses knowledge on heater control units, starting aids, system voltage requirements, and sensible heat concepts, crucial for professionals managing heating systems.

2a6x2 CDC Vol 4 - Quiz

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  • 2. 

    When servicing the hydraulic cart, which prevents large particles in the fluid from entering the reservoir?

    • Line filter

    • Check valve

    • Mesh screen

    • Relief valve

    Correct Answer
    A. Mesh screen
    Explanation
    A mesh screen is used to prevent large particles in the fluid from entering the reservoir when servicing the hydraulic cart. This screen acts as a filter, allowing only smaller particles and clean fluid to pass through while blocking larger debris. By doing so, it helps to maintain the cleanliness of the hydraulic fluid and prevent any potential damage to the system caused by the presence of large particles.

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  • 3. 

    At which storage cylinder pressure, in pounds per square inch gauge (psig), should the SGNSC nitrogen booster compressor stop?

    • 2400

    • 4100

    • 4400

    • 6400

    Correct Answer
    A. 4400
    Explanation
    The SGNSC nitrogen booster compressor should stop at a storage cylinder pressure of 4400 pounds per square inch gauge (psig).

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  • 4. 

    If a bomblift starter failed to operate, which step should be taken first?

    • Replace the starter

    • Check the starter cables

    • Remove and replace the battery

    • Check the battery terminals and posts

    Correct Answer
    A. Check the battery terminals and posts
    Explanation
    The first step that should be taken if a bomblift starter failed to operate is to check the battery terminals and posts. This is because if the terminals and posts are corroded or loose, it can prevent the starter from receiving the necessary electrical power to operate. By checking and ensuring the battery terminals and posts are clean and securely connected, any potential issues related to power supply can be addressed before moving on to other troubleshooting steps.

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  • 5. 

    Which must be done before lowering the ram on the B-6 tripod jack?

    • Tighten the ram lock nut

    • Loosen the ram lock nut

    • Close the relief valve

    • 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 prevents it from moving. Loosening the lock nut allows the ram to be lowered smoothly and safely.

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  • 6. 

    During the MJ-1B bomblift operation check, all hydraulic components should exhibit 

    • A smooth movement with no binding or no jumping

    • Fast steady movements with minimal jumping

    • Some selling once the actuator is released

    • Small amounts of residue

    Correct Answer
    A. A smooth movement with no binding or no jumping
    Explanation
    During the MJ-1B bomblift operation check, it is expected that all hydraulic components should exhibit a smooth movement with no binding or jumping. This means that the components should move seamlessly without any obstruction or sudden jerky movements. Any binding or jumping could indicate a malfunction or issue with the hydraulic system, which could potentially affect the operation of the bomblift. Therefore, it is important for all hydraulic components to function smoothly and without any irregularities.

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  • 7. 

    Which must be done prior to raising or lowering the mast from the vertical or horizontal position on the FL-1D floodlight set?

    • Secure all doors

    • Warm-up the engine

    • Set the master control switch to ON

    • Position the tow bar to the left or right

    Correct Answer
    A. Position the tow bar to the left or right
    Explanation
    Prior to raising or lowering the mast from the vertical or horizontal position on the FL-1D floodlight set, it is necessary to position the tow bar to the left or right. This is important because the tow bar is used to stabilize and control the movement of the mast during the raising or lowering process. By positioning the tow bar to the left or right, it ensures that the mast remains stable and prevents any potential accidents or damage.

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  • 8. 

    Where can you find test procedures for a particular component on a FL-1D floodlight set?

    • Unit manufacturer's technical order (TO)

    • Periodic inspection workcards

    • Service inspection workcards

    • 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 maintenance, repair, and inspection of specific components. It is specific to the unit manufacturer and would contain the necessary test procedures for the FL-1D floodlight set. The periodic and service inspection workcards may provide general guidelines but may not have the specific test procedures needed. The illustrated parts breakdown would provide information on the components and their assembly but may not include test procedures.

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  • 9. 

    Every how many years is the hydrostatic test due on the receiver tank on a MC-20 air compressor?

    • 9

    • 7

    • 5

    • 3

    Correct Answer
    A. 5
    Explanation
    The hydrostatic test is due on the receiver tank of a MC-20 air compressor every 5 years. This test is important to ensure the tank's structural integrity and safety. By conducting the test regularly, any potential weaknesses or leaks can be identified and addressed promptly, reducing the risk of accidents or equipment failure.

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  • 10. 

    When trouble shooting the MJ-1B bomblift electrical system, which component will give you a visual indication that the alternator is charging the batteries?

    • Ammeter

    • Voltmeter

    • Bright head lights

    • Control panel light

    Correct Answer
    A. Ammeter
    Explanation
    The ammeter is the component that will give a visual indication that the alternator is charging the batteries. An ammeter measures the flow of electric current in a circuit, so if the alternator is charging the batteries, the ammeter will show a positive reading indicating the current flowing into the batteries. The voltmeter measures the voltage in a circuit, so it wouldn't specifically indicate if the alternator is charging the batteries. Bright headlights and control panel lights are not directly related to the charging of batteries by the alternator.

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  • 11. 

    Which type of mechanism does the B-4 adjustable aircraft maintenance platform use to raise and lower the platform?

    • Screw

    • Scissor

    • Ratchet

    • Pneumatic

    Correct Answer
    A. Scissor
    Explanation
    The B-4 adjustable aircraft maintenance platform uses a scissor mechanism to raise and lower the platform. A scissor mechanism consists of two crossed beams connected by a series of folding supports, resembling a pair of scissors. When the platform is raised, the folding supports extend, and when it is lowered, they retract, allowing for easy height adjustment. This type of mechanism is commonly used in various applications where vertical movement is required, such as lifting platforms, car jacks, and certain types of industrial equipment.

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  • 12. 

    Which section of the MD-1 towbar has a screw actuated fork assembly that is used to engage or disengage the aircraft nose gear?

    • Head adapter assembly

    • Main tube assembly

    • Extension tubes

    • 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 securely connecting the towbar to the nose gear of the aircraft, allowing for easy towing and movement. The screw actuated fork assembly provides a mechanism for smoothly engaging or disengaging the nose gear, ensuring safe and efficient operations.

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  • 13. 

    Which position is the valve handle places in to precharge the PMU-29/E oil cart supply tank?

    • BYPASS

    • OPEN

    • OFF

    • ON

    Correct Answer
    A. BYPASS
    Explanation
    To precharge the PMU-29/E oil cart supply tank, the valve handle should be placed in the BYPASS position. This position allows the oil to bypass the tank and flow directly into the system, ensuring that the tank is filled with oil before normal operation begins. The OPEN position would allow the oil to flow into the tank without bypassing it, potentially causing overfilling or pressure issues. The OFF position would completely shut off the flow of oil, while the ON position would allow the oil to flow into the system without precharging the tank.

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  • 14. 

    The chain hoist on the universal jack tester is operated by

    • Pressure from the jack

    • Beam assembly

    • A control box

    • 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 has buttons or switches that allow the user to control the lifting and lowering of the hoist, as well as other functions such as speed and direction. The control box acts as the interface between the user and the chain hoist, allowing for precise and controlled operation.

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  • 15. 

    Which MJ-1B bomblift valve prevents collapsing of the cantilever lifting arms in the event of hydraulic pressure failure?

    • Air bleed

    • Rotary bypass

    • Counterbalance

    • Over pressurization

    Correct Answer
    A. Counterbalance
    Explanation
    The counterbalance valve is designed to prevent the collapsing of the cantilever lifting arms in the event of hydraulic pressure failure. It achieves this by providing a controlled flow of hydraulic fluid to the lifting arms, which creates a counteracting force against the weight of the load. This ensures that even if the hydraulic pressure fails, the counterbalance valve will maintain the necessary support to prevent the arms from collapsing.

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  • 16. 

    When should starting aids be used to start the New Generation Heater (NGH)?

    • When the temperature guage reads COOL

    • Never, as it will result in serious engine damage

    • When ambient temperature is below 32 degrees Fahrenheit

    • During the engine startup with the ignition switch in PREHEAT position

    Correct Answer
    A. Never, as it will result in serious engine damage
    Explanation
    Starting aids should never be used to start the New Generation Heater (NGH) as it will result in serious engine damage. This implies that using starting aids can cause harm to the engine and is not recommended.

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  • 17. 

    When verifying the proper operation of the MHU-83C/E bomblift centering mechanism, the unit should 

    • Start in reverse

    • Move in neutral

    • Not start in reverse

    • 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, it should not move in neutral. This means that when the unit is in neutral, it should remain stationary and not move. This is important for ensuring the safety and stability of the bomblift during operation. If the unit were to move in neutral, it could pose a risk of accidents or damage to the equipment or surroundings. Therefore, it is essential that the bomblift remains stationary when in neutral.

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  • 18. 

    The volume of oil delivered from the hydraulic pump to the hydrostatic motor on the MJ-1B bomblift determines the 

    • Direction of the lift arms

    • Speed of the lift arms

    • Direction of the truck

    • Speed of the truck

    Correct Answer
    A. Speed of the truck
    Explanation
    The volume of oil delivered from the hydraulic pump to the hydrostatic motor on the MJ-1B bomblift determines the speed of the truck. Hydraulic pumps are responsible for generating fluid flow, and in this case, the volume of oil being delivered directly affects the speed at which the truck operates. A higher volume of oil will result in a faster speed, while a lower volume will result in a slower speed. Therefore, the volume of oil delivered from the pump determines the speed of the truck.

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  • 19. 

    Which position should the vent valve be in when liquid oxygen (LOX) carts are being transported?

    • Tow

    • Closed

    • Opened

    • Transport

    Correct Answer
    A. Closed
    Explanation
    When liquid oxygen (LOX) carts are being transported, the vent valve should be in the closed position. This is because liquid oxygen is highly reactive and can easily ignite or explode if it comes into contact with flammable materials or if the pressure inside the cart increases. By keeping the vent valve closed, it ensures that the oxygen remains contained and prevents any potential accidents or hazards during transportation.

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  • 20. 

    Which component provides manual speed adjustment on the AF/M32T-1 cabin leakage tester limits system pressure to 15 pounds per square inch (psi)?

    • Tachometer

    • Diesel engine

    • Throttle assembly

    • Fuel system relief valve

    Correct Answer
    A. Throttle assembly
    Explanation
    The throttle assembly is the component that provides manual speed adjustment on the AF/M32T-1 cabin leakage tester limits system pressure to 15 pounds per square inch (psi). The throttle assembly controls the amount of fuel and air mixture entering the engine, which in turn determines the speed and power output. By adjusting the throttle, the operator can regulate the engine speed and limit the system pressure to the desired level.

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  • 21. 

    Which type of refrigeration system leak occurs when the pressure within the system is less than atmospheric pressure?

    • Inward

    • Vacuum

    • Pressure

    • Outward

    Correct Answer
    A. Inward
    Explanation
    Inward refrigeration system leak occurs when the pressure within the system is less than atmospheric pressure. This means that air or other gases from the atmosphere are being drawn into the system, causing a leak.

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  • 22. 

    Check the MHU-83C/E bomblift backup hydraulic system by 

    • Closing the shutoff valve

    • Operating the hand pump

    • Closing the air bleed valve

    • Operating the system pump

    Correct Answer
    A. Operating the hand pump
    Explanation
    To check the MHU-83C/E bomblift backup hydraulic system, one should operate the hand pump. This is because the hand pump is used to manually pressurize the hydraulic system when the main pump is not functioning or unavailable. By operating the hand pump, one can ensure that the backup hydraulic system is functioning properly and can provide the necessary hydraulic pressure when needed.

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  • 23. 

    The purpose of the lift mechanism on the MD-1 tow bar is to 

    • Adjust the forks

    • Stabalize the main tube assembly

    • Raise and lower the wheel assemblies

    • Engage or disengage the airgraft nose gear

    Correct Answer
    A. Raise and lower the wheel assemblies
    Explanation
    The lift mechanism on the MD-1 tow bar is designed to raise and lower the wheel assemblies. This allows for easy maneuverability and transportation of the aircraft. By lifting the wheel assemblies, the tow bar can be attached or detached from the aircraft's landing gear, making it convenient for towing operations. It also ensures that the aircraft's wheels are properly aligned and positioned during the towing process, enhancing safety and efficiency.

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  • 24. 

    Which valve is used to slowly raise or lower the MJ-1B bomblift arms?

    • Lateral control

    • Longitudinal control

    • Cradle lift arm control

    • Control panel lift arm control

    Correct Answer
    A. Cradle lift arm control
    Explanation
    The cradle lift arm control is used to slowly raise or lower the MJ-1B bomblift arms. This control allows for precise and gradual movement of the arms, ensuring safe and accurate positioning of the bomblift.

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  • 25. 

    Oil in a rotary vane compressor

    • Lubricates the connection rods.

    • Has high viscosity and is very inflammable

    • Froms a seal between the vanes and the stator

    • Permits it to be classified as a high pressure unit

    Correct Answer
    A. Froms a seal between the vanes and the stator
    Explanation
    The oil in a rotary vane compressor forms a seal between the vanes and the stator. This is important because it prevents leakage of compressed air and ensures efficient operation of the compressor. Without the oil seal, there would be loss of pressure and decreased performance. Therefore, the oil plays a crucial role in maintaining the proper functioning of the compressor by creating a tight seal between the moving parts.

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  • 26. 

    As soon as the MJ-1B engine starts, check for sufficient

    • Hydraulic pressure

    • Battery charging

    • Fuel pressure

    • Oil pressure

    Correct Answer
    A. Oil pressure
    Explanation
    The MJ-1B engine needs to have sufficient oil pressure in order to function properly. Oil pressure is essential for lubricating the engine's moving parts and preventing excessive wear and tear. Without sufficient oil pressure, the engine could suffer damage and potentially fail. Therefore, it is crucial to check the oil pressure as soon as the engine starts to ensure that it is at the required level for smooth and safe operation.

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  • 27. 

    How is the air compressor in the self generating nitrogen servicing cart (SGNSC) categorized?

    • High Pressure

    • Low pressure

    • High volume

    • Low volume

    Correct Answer
    A. High Pressure
    Explanation
    The air compressor in the self-generating nitrogen servicing cart (SGNSC) is categorized as high pressure because it is designed to generate and deliver compressed air at a high pressure level. This is necessary for tasks such as inflating aircraft tires, where a significant amount of pressure is required to properly inflate the tires and ensure safe operation.

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  • 28. 

    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?

    • Base assembly

    • Upper platform

    • Stair support linkage

    • Hydraulic cylinder assemble

    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 safe and efficient access to different areas of the aircraft during maintenance and repair operations.

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  • 29. 

    When starting the MA-3D air conditioner, hold the safety override switch until 

    • 30 pounds of oil pressure is reached on the engine oil pressure gauge.

    • The start switch is released

    • The engine warms up

    • The engine starts

    Correct Answer
    A. 30 pounds of oil pressure is reached on the engine oil pressure gauge.
    Explanation
    The correct answer is to hold the safety override switch until 30 pounds of oil pressure is reached on the engine oil pressure gauge. This is because the air conditioner should not be started until there is sufficient oil pressure in the engine. The oil pressure gauge is used as a measure of this pressure, and reaching 30 pounds ensures that the engine is ready to start and operate properly.

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  • 30. 

    In which position is the engine switch placed to energize the electric fuel pump, fuel solenoid, and regulator on the split deck maintenance platform?

    • RUN

    • MODE

    • START

    • DRIVE

    Correct Answer
    A. RUN
    Explanation
    The engine switch is placed in the RUN position to energize the electric fuel pump, fuel solenoid, and regulator on the split deck maintenance platform. This position allows the engine to start and run properly by providing power to these components.

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  • 31. 

    Which is important to keep in mind when performing maintenance on the SGNSC?

    • Weather conditions

    • Wind direction

    • Ventilation

    • Safety

    Correct Answer
    A. Safety
    Explanation
    When performing maintenance on the SGNSC, it is important to keep safety in mind. This means taking precautions to ensure the well-being and protection of oneself and others. Maintenance work can involve potential hazards and risks, so following safety protocols, using protective equipment, and being aware of potential dangers is crucial. Safety should always be the top priority to prevent accidents, injuries, or damage to the equipment or surroundings.

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  • 32. 

    Continuous movement of pressurized hydraulic fluid in the MJ-1B bomblift causes the fluid to become

    • Cooled

    • Heated

    • Compressed

    • Contaminated

    Correct Answer
    A. Heated
    Explanation
    The continuous movement of pressurized hydraulic fluid in the MJ-1B bomblift causes friction, which generates heat. As the fluid flows through the system, it absorbs this heat, resulting in an increase in temperature. Therefore, the correct answer is "heated."

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  • 33. 

    Which is the compressor displacement when the ACE 802S air conditioner compressor is in the HOLD  position?

    • Maximum

    • Minimum

    • Constant

    • Erradic

    Correct Answer
    A. Constant
    Explanation
    The compressor displacement refers to the volume of air that the compressor is capable of moving in a given amount of time. In the HOLD position, the compressor is not actively compressing or moving any air, so the compressor displacement remains constant.

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  • 34. 

    Which MJ-2A-1 hydraulic test stand engine system safety device sounds the warning horn in the event of an engine system malfunction?

    • Water level switch

    • Oil pressure switch

    • Fuel level indicator

    • Fuel pressure switch

    Correct Answer
    A. Oil pressure switch
    Explanation
    The oil pressure switch is the correct answer because it is a safety device that monitors the oil pressure in the engine system. In the event of an engine system malfunction, such as low oil pressure, the oil pressure switch will detect this and sound the warning horn to alert the operator. This is important as low oil pressure can cause engine damage or failure, and the warning horn ensures that the operator is aware of the issue and can take appropriate action.

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  • 35. 

    Which prevents over pressurization of the steering system on the MJ-1B bomblift

    • Bleed valve

    • Relief valve

    • Bypass valve

    • Pressure regulator

    Correct Answer
    A. Relief valve
    Explanation
    A relief valve is designed to prevent over pressurization in a system by opening and releasing excess pressure. In the case of the MJ-1B bomblift's steering system, a relief valve would be installed to ensure that the pressure does not exceed safe levels. This valve would open when the pressure reaches a certain threshold, allowing the excess pressure to escape and preventing damage to the steering system. This helps maintain the proper functioning and safety of the bomblift during operation.

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  • 36. 

    To start the SGNSC the operator places the ignition switch in the start position for no more than how many seconds?

    • 5

    • 10

    • 15

    • 20

    Correct Answer
    A. 10
    Explanation
    The operator must place the ignition switch in the start position for no more than 10 seconds to start the SGNSC.

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  • 37. 

    The ACE 802S air conditioner compressor switch must be held in the HOLD position when engaging the compressor in order to

    • Ensure the engine is at governed speed before engaging compressor

    • Allow compressor oil and discharge pressures to stabilize

    • Defrost the evaporator

    • Buildup oil pressure

    Correct Answer
    A. Allow compressor oil and discharge pressures to stabilize
    Explanation
    When engaging the compressor, holding the ACE 802S air conditioner compressor switch in the HOLD position allows the compressor oil and discharge pressures to stabilize. This is important because it ensures that the compressor operates efficiently and effectively. Stabilizing the oil and discharge pressures helps to prevent any sudden surges or fluctuations that could potentially damage the compressor or other components of the air conditioning system. By allowing these pressures to stabilize, the compressor can function properly and provide the desired cooling effect.

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  • 38. 

    Which is the proper compressor oil level when checking the sight glass on the MC20 air compressor

    • Between the bottom and half way up on the sight glass

    • Between half way and the top of the sight glass

    • Any oil level present in the sight glass

    • At least one third up the sight glass

    Correct Answer
    A. Any oil level present in the sight glass
    Explanation
    The correct answer is "Any oil level present in the sight glass." This means that as long as there is some oil visible in the sight glass, the compressor oil level is considered proper. It doesn't matter if the oil level is at the bottom, halfway up, or even close to the top of the sight glass. As long as there is oil present, it indicates that there is enough lubrication for the compressor to function properly.

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  • 39. 

    Which valve protects the MJ-2A-1 hydraulic test stand from over pressurization when the unit is not operating?

    • High pressure relief

    • Thermal relief

    • Check relief

    • Fill relief

    Correct Answer
    A. Thermal relief
    Explanation
    The thermal relief valve protects the MJ-2A-1 hydraulic test stand from over pressurization when the unit is not operating by releasing excess pressure caused by thermal expansion. This valve is designed to open at a specific temperature and relieve the pressure to prevent damage to the system.

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  • 40. 

    Which are the two lifting capacities (pounds) of the davit lift pulley on the split deck maintenance platform?

    • 150 and 550

    • 250 and 500

    • 550 and 2000

    • 1000 and 2000

    Correct Answer
    A. 250 and 500
    Explanation
    The davit lift pulley on the split deck maintenance platform has two lifting capacities: 250 pounds and 500 pounds.

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  • 41. 

    The MC20 air compressor provides which kind of air for pneumatic tools and tire inflation?

    • High pressure

    • Low pressure

    • High volume

    • Low volume

    Correct Answer
    A. Low pressure
    Explanation
    The MC20 air compressor provides low pressure air for pneumatic tools and tire inflation. Low pressure air is typically used for tasks that require less force or power, such as inflating tires or operating smaller pneumatic tools. High pressure air, on the other hand, is used for tasks that require more force or power, such as operating heavy-duty pneumatic tools or machinery. Therefore, the MC20 air compressor is specifically designed to deliver low pressure air for these specific applications.

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  • 42. 

    While operating the split deck maintenance platform you realize the platform will not lower, the most probable cause could be 

    • Corroded battery cables

    • A defective control cable

    • The main disonnect switch is ON

    • The engine switch is in RUN position

    Correct Answer
    A. A defective control cable
    Explanation
    The most probable cause for the platform not lowering while operating the split deck maintenance platform is a defective control cable. This could be due to a malfunction or damage in the control cable, preventing it from properly functioning and lowering the platform.

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  • 43. 

    Which valve protects the MJ-2A-1 hydraulic test stand from over pressurization when the unit is not operating?

    • High pressure relief

    • Thermal relief

    • Check/relief

    • Fill relief

    Correct Answer
    A. Thermal relief
    Explanation
    The thermal relief valve protects the MJ-2A-1 hydraulic test stand from over pressurization when the unit is not operating. This valve is designed to open and release excess pressure in the system when the temperature exceeds a certain limit, preventing damage to the equipment. It ensures the safety and longevity of the test stand by relieving pressure caused by thermal expansion.

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  • 44. 

    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?

    • Fill switch, LS4

    • Fill master switch

    • Fill micro switch, FS1

    • Fill to start relay switch

    Correct Answer
    A. Fill switch, LS4
    Explanation
    The LS4 fill switch provides an alternate means of energizing the fill pump when either of the micro switches are defective. This means that if either of the micro switches that are responsible for energizing the fill pump are not working properly, the LS4 fill switch can be used as a backup to still activate the fill pump.

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  • 45. 

    The most obvious and easiest way of isolating most hydraulic malfunctions is to look for 

    • Slow operation

    • Erratic operation

    • Fluid under the unit

    • Movement when the control valve is not actuated

    Correct Answer
    A. Fluid under the unit
    Explanation
    Looking for fluid under the unit is the most obvious and easiest way of isolating most hydraulic malfunctions because if there is fluid leaking from the hydraulic system, it indicates a problem with the system. Fluid under the unit could be a sign of a leak in the hydraulic lines, hoses, or seals, which can cause slow or erratic operation of the hydraulic system. Therefore, identifying fluid under the unit can help pinpoint the source of the malfunction and allow for necessary repairs to be made.

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  • 46. 

    How can a restriction in a refrigerant system be identified?

    • Sweating at the outlet of a component

    • Frosting at the outlet of a component

    • Abnormal compressor noise

    • Increased suction pressure

    Correct Answer
    A. Frosting at the outlet of a component
    Explanation
    A restriction in a refrigerant system can be identified by observing frosting at the outlet of a component. When there is a restriction in the system, the flow of refrigerant is reduced, causing a decrease in pressure and temperature at the outlet of the component. This leads to the formation of frost on the component. Therefore, the presence of frosting indicates a restriction in the refrigerant system.

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  • 47. 

    Refirgerant leaving the evaporator coil, in the MA-3D air conditioner, is a 

    • Low pressure gas

    • High pressure gas

    • Low pressure liquid

    • High pressure liquid

    Correct Answer
    A. Low pressure gas
    Explanation
    The refrigerant leaving the evaporator coil in the MA-3D air conditioner is a low pressure gas. This is because the evaporator coil is where the refrigerant absorbs heat from the surrounding air and evaporates, changing from a liquid to a gas. As a result, the refrigerant exits the evaporator coil as a low pressure gas, ready to be compressed and condensed in the next stage of the cooling process.

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  • 48. 

    Which MA-3D air conditioner control switch allows the operator to control the overall volume of air leaving the unit?

    • Blower

    • Airflow

    • Evaporator

    • Temperature

    Correct Answer
    A. Airflow
    Explanation
    The correct answer is "Airflow" because the airflow control switch on the MA-3D air conditioner allows the operator to control the overall volume of air leaving the unit. This switch regulates the speed at which the blower fan operates, determining the amount of air that is being circulated and ultimately controlling the airflow. By adjusting the airflow, the operator can increase or decrease the amount of air being delivered, providing control over the cooling or heating capacity of the air conditioner.

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  • 49. 

    Which MHU-83C/E bomblift component supplies the brake valve and caliperrs with fluid?

    • System pump

    • Steering pump

    • Transmission pump

    • Hydraulic system control valve

    Correct Answer
    A. System pump
    Explanation
    The system pump is responsible for supplying the brake valve and calipers with fluid in the MHU-83C/E bomblift. This pump is a crucial component of the hydraulic system and is designed to generate the necessary pressure to operate the brakes. Without the system pump, the brake valve and calipers would not receive the fluid needed to effectively stop the bomblift, compromising its safety and functionality.

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Quiz Review Timeline (Updated): May 21, 2024 +

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  • Current Version
  • May 21, 2024
    Quiz Edited by
    ProProfs Editorial Team
  • Mar 29, 2018
    Quiz Created by
    D. Crook

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