# 2A652 Volume 4 CDC Pretest

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Quizzes Created: 4 | Total Attempts: 6,360
Questions: 90 | Attempts: 1,346

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• 1.

### What component on the New Generation Heater activates the heater control unit(HCU)?

• A.

Heat control switch

• B.

Burner control unit

• C.

Thermostatic sensor

• D.

Oil pressure switch

A. Heat control switch
Explanation
The heat control switch is the component on the New Generation Heater that activates the heater control unit (HCU). When the heat control switch is turned on, it sends a signal to the HCU to start the heating process. This switch allows the user to control the temperature and turn the heater on or off as desired. The burner control unit, thermostatic sensor, and oil pressure switch are not responsible for activating the HCU.

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• 2.

### When does the heater control unit (HCU) on the New Generation Heater start the main air fan for output air?

• A.

When a heat setting is selected

• B.

Once constant flame is established

• C.

When the temperature gauge reads COOL

• D.

When the inside temperature reaches 140 F

D. When the inside temperature reaches 140 F
Explanation
The correct answer is "When the inside temperature reaches 140 F". The heater control unit (HCU) starts the main air fan for output air when the inside temperature reaches 140 F. This indicates that the heater has reached the desired temperature and is ready to distribute warm air throughout the space.

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• 3.

### When should you use starting aids to start the New Generation Heater?

• A.

Never

• B.

Occasionally

• C.

When the temperature gauge reads COOL

• D.

When ambient temperature is below 32 F

A. Never
Explanation
Starting aids should never be used to start the New Generation Heater. This implies that the heater does not require any external assistance or additional starting aids to function properly.

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• 4.

### When operating the New Generation Heater, turn the heat control switch to the desired position after

• A.

Ample warm-up time

• B.

A minimum of 45 seconds

• C.

System voltage rises to 120 VAC

• D.

The inside temperature reaches 140 F

C. System voltage rises to 120 VAC
Explanation
The correct answer is "system voltage rises to 120 VAC". This means that the heat control switch should be turned to the desired position only after the system voltage has reached 120 VAC. This is important because the heater may not function properly or efficiently if it is turned on before the system voltage has reached the required level. Waiting for the system voltage to rise ensures that the heater will work effectively and provide the desired level of heat.

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• 5.

### If you need to find out how to perform any maintenance required during an inspection, you should refer to the

• A.

-1 TO

• B.

PE workcards

• C.

Methods and procedures TO

• D.

Service inspection workcards

A. -1 TO
Explanation
If you need to find out how to perform any maintenance required during an inspection, you should refer to the TO (Technical Orders) workcards. These workcards contain detailed instructions, methods, and procedures for performing maintenance tasks. They are a valuable resource for technicians and provide step-by-step guidance on how to carry out maintenance activities safely and efficiently. By referring to the TO workcards, technicians can ensure that they follow the correct procedures and perform the necessary maintenance tasks accurately.

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• 6.

### The type of inspection that requires the most tear down of specific components is the

• A.

Daily inspection

• B.

Service inspection

• C.

Special inspection

• D.

Periodic inspection

C. Special inspection
Explanation
The special inspection requires the most tear down of specific components compared to the other types of inspections mentioned. This type of inspection involves a thorough examination and evaluation of specific components or systems that may require disassembly or removal to assess their condition or performance. The tear down is necessary to ensure a comprehensive inspection and to identify any potential issues or defects that may not be visible during a visual inspection.

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• 7.

### The first step of troubleshooting heater equipment is

• A.

Analysis

• B.

Isolation

• C.

Recognition

• D.

Verification

C. Recognition
Explanation
The first step of troubleshooting heater equipment is recognition. This means identifying and acknowledging the problem or issue with the equipment. By recognizing the problem, one can then proceed to the next steps of troubleshooting, such as analysis, isolation, and verification. Recognition is crucial as it allows for a targeted and effective troubleshooting process, ensuring that the correct solutions are implemented to resolve the issue with the heater equipment.

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• 8.

### Repair of ground heater equipment should never be attempted

• A.

Without first talking with the operator

• B.

• C.

Unless accurate technical data is available

• D.

Unless in the presence of an experienced mechanic

C. Unless accurate technical data is available
Explanation
Repairing ground heater equipment can be dangerous and should only be done if accurate technical data is available. This is because without proper technical data, one may not have the necessary information or instructions to safely repair the equipment. Accurate technical data ensures that the repair is carried out correctly and minimizes the risk of any further damage or accidents. It is important to have access to accurate technical data to ensure the safety and effectiveness of the repair process.

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• 9.

### The amount of heat required to raise the temperature of one pound of a substance one degree Faharenheit is known as

• A.

Super heat

• B.

Laten heat

• C.

BTU

• D.

Sensible heat

C. BTU
Explanation
BTU stands for British Thermal Unit, and it is the amount of heat required to raise the temperature of one pound of a substance by one degree Fahrenheit. This unit is commonly used in the field of heating, ventilation, and air conditioning (HVAC) to measure the amount of heat energy needed to heat or cool a space. Therefore, BTU is the correct answer in this context.

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• 10.

### Heat that can be felt, and added or subtracted to a substance without changing its state is called

• A.

Super heat

• B.

Latent heat

• C.

Specific heat

• D.

Sensible heat

D. Sensible heat
Explanation
Sensible heat refers to the heat that can be felt and added or subtracted to a substance without causing a change in its state. It is the heat that affects the temperature of an object or substance, and can be measured using a thermometer. Sensible heat is different from latent heat, which is the heat absorbed or released during a phase change, and specific heat, which is the amount of heat required to raise the temperature of a unit mass of a substance by one degree Celsius.

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• 11.

### The heat that changes the state of a substance, yet does not affect the temperature is called

• A.

Super heat

• B.

Latent heat

• C.

Specific heat

• D.

Sensible heat

B. Latent heat
Explanation
Latent heat refers to the heat energy absorbed or released during a phase change of a substance, such as from solid to liquid or liquid to gas, without changing its temperature. This heat is used to break or form intermolecular bonds between particles, causing the substance to change its state. Unlike sensible heat, which affects the temperature of a substance, latent heat does not cause a change in temperature but is responsible for the transformation between different states of matter.

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• 12.

### Heat added to a gaseous substance is known as

• A.

Super heat

• B.

Latent heat

• C.

Specific heat

• D.

Sensible heat

A. Super heat
Explanation
Superheat refers to the heat added to a gaseous substance above its boiling point or saturation temperature. This occurs when the substance is heated beyond its phase change point, causing it to exist in a gaseous state at a higher temperature than its boiling point. Superheating is commonly used in industrial processes to increase the efficiency of heat transfer or to prevent condensation in steam systems.

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• 13.

### A good refigerant would

• A.

Operate with low pressure

• B.

Have a low boiling point

• C.

Not be poisonous

• D.

All of the above

D. All of the above
Explanation
A good refrigerant should operate with low pressure to ensure safety and efficiency in the cooling system. It should also have a low boiling point so that it can easily evaporate and absorb heat from the surroundings. Additionally, it should not be poisonous to prevent any harm to humans or the environment. Therefore, the correct answer is "all of the above" as all these characteristics are essential for a good refrigerant.

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• 14.

### What component on the MA-3D air conditioner allows the operator to control the overall volume of air leaving the unit?

• A.

Blower control switch

• B.

Airflow control switch

• C.

Evaporator control switch

• D.

Temperature control switch

B. Airflow control switch
Explanation
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 is specifically designed to adjust the airflow and can be used to increase or decrease the amount of air being circulated by the air conditioner. By manipulating the airflow control switch, the operator can customize the cooling or heating effect according to their preference or the specific requirements of the environment.

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• 15.

### After the refrigerant leaves the compressor on the MA-3D air conditioner, it flows through the

• A.

Heatsink coils

• B.

Condenser coils

• C.

Evaporator coils

• D.

B. Condenser coils
Explanation
After the refrigerant leaves the compressor, it flows through the condenser coils. The condenser coils are responsible for releasing heat from the refrigerant to the surrounding air. As the refrigerant flows through these coils, it undergoes a phase change from a high-pressure gas to a high-pressure liquid. This process allows the refrigerant to release the heat it absorbed from the indoor air during the cooling cycle. Therefore, the condenser coils play a crucial role in the heat exchange process of an air conditioner.

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• 16.

### The temperature controller on the MA-3D air conditioner modulates the water flow through what component during low ambient air temperatures?

• A.

Aftercooler coils

• B.

Refrigerant coil

• C.

Expansion valve

• D.

Condenser coil

A. Aftercooler coils
Explanation
During low ambient air temperatures, the temperature controller on the MA-3D air conditioner modulates the water flow through the aftercooler coils. Aftercooler coils are responsible for cooling down the compressed air after it passes through the compressor. By modulating the water flow through these coils, the temperature controller can effectively control the cooling process and maintain the desired temperature in the air conditioner. This ensures optimal performance and energy efficiency, especially in low ambient air temperature conditions.

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• 17.

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

• A.

The engine starts

• B.

The engine warms up

• C.

You release the start switch

• D.

30 psi oil pressure is registered on the engine oil pressure gauge

D. 30 psi oil pressure is registered on the engine oil pressure gauge
Explanation
The correct answer is "30 psi oil pressure is registered on the engine oil pressure gauge." This is because the air conditioner should only be started once the engine has reached a sufficient oil pressure of 30 psi. This ensures that the engine is properly lubricated and ready to operate the air conditioner. Holding the safety override switch until this pressure is registered helps prevent any potential damage or issues that may occur if the air conditioner is started without adequate oil pressure.

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• 18.

### What component on the MA-3D air conditioner shuts off the compressors when refrigerant pressure entering the evaproator coil reaches 5 psi?

• A.

Low pressure cutout

• B.

High pressure cutout

• C.

Temperature controller

• D.

Temperature control switch

C. Temperature controller
Explanation
The temperature controller is the component on the MA-3D air conditioner that shuts off the compressors when the refrigerant pressure entering the evaporator coil reaches 5 psi. It is responsible for monitoring and regulating the temperature in the system, ensuring that it stays within the desired range. When the pressure reaches a certain threshold, the temperature controller activates and shuts off the compressors to prevent any damage or malfunction in the system.

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• 19.

### What equipment inspection requires the inspection of only asterisked items in the workcards?

• A.

Annual

• B.

Phase I

• C.

Service

• D.

Phase II

B. Phase I
Explanation
Phase I equipment inspection requires the inspection of only asterisked items in the workcards. This means that during Phase I inspection, only the items marked with an asterisk on the workcards are inspected. The other options, such as Annual, Service, and Phase II inspections, do not have this requirement.

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• 20.

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

• A.

Vacuum leaks

• B.

Inward leaks

• C.

Outward leaks

• D.

Pressure leaks

B. Inward leaks
Explanation
Inward leaks occur in a refrigeration system when the pressure within the system is less than atmospheric pressure. This means that air or other substances from outside the system are being drawn into the system, causing a decrease in pressure. Inward leaks can lead to a loss of refrigerant and a decrease in the system's efficiency.

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• 21.

### The refrigerant on the air conditioner is always removed through the

• A.

Purge valve

• B.

• C.

• D.

Discharge service valve

Explanation
The receiver outlet valve is the correct answer because it is responsible for removing the refrigerant from the air conditioner. The receiver is a storage tank that holds excess refrigerant, and the outlet valve allows for the controlled release of the refrigerant from the receiver. This valve ensures that the refrigerant is properly expelled from the system, preventing any potential damage or inefficiencies.

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• 22.

### The air cycle machine of an A/M32C-10D air condition consists of

• A.

An expansion turbine only

• B.

An air compressor fan only

• C.

Heat exchanger and an expansion turbine

• D.

An expansion turbine and an air compressor fan

D. An expansion turbine and an air compressor fan
Explanation
The correct answer is an expansion turbine and an air compressor fan. An air cycle machine is a type of air conditioning system used in aircraft. It consists of an expansion turbine, which is responsible for cooling the air by expanding it, and an air compressor fan, which compresses the air and circulates it through the system. The expansion turbine helps to cool the air, while the air compressor fan ensures proper circulation. Both components are essential for the functioning of the air cycle machine.

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• 23.

### On a basic rotary compressor, what prevents air form leaving the discharge port while the intake prot is taking air in?

• A.

Sliding barrier

• B.

Discharge valve

• C.

Rotating barrier

• D.

Stationary barrier

D. Stationary barrier
Explanation
The correct answer is a stationary barrier. In a basic rotary compressor, a stationary barrier is used to prevent air from leaving the discharge port while the intake port is taking air in. This barrier remains in a fixed position and acts as a blockage to maintain the air pressure within the compressor. It ensures that the air flow is directed in the desired direction and prevents any leakage from the discharge port during the intake process.

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• 24.

### Oil in the rotary vane compressor

• A.

Lubricates the connecting rods

• B.

Has high viscosity and is very inflammable

• C.

Forms a seal between the vanes and the stator

• D.

Permits it to be typed as a high pressure unit

C. Forms a seal between the vanes and the stator
Explanation
The oil in the rotary vane compressor serves the purpose of forming a seal between the vanes and the stator. This seal is important to prevent any leakage of air or gas during the compression process. By creating a tight seal, the oil ensures that the compression is efficient and effective. Additionally, the oil helps to reduce friction and wear between the moving parts, thus prolonging the lifespan of the compressor. It is worth noting that the viscosity of the oil is high, which allows it to effectively maintain the seal, and it is also highly inflammable to ensure safety during operation.

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• 25.

### What provides pressurized oil to the rotor blades of the MC-2A toraty sliding vane compressor?

• A.

Rotor shaft

• B.

Stator shaft

• C.

Drilled passages

• D.

Hollow-ported bolt

A. Rotor shaft
Explanation
The rotor shaft provides pressurized oil to the rotor blades of the MC-2A toraty sliding vane compressor.

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• 26.

### On the MC-2A rotary sliding vane compressor, the minimum pressure valve does all of the following except

• A.

Ensure minimum pressure to the felt pads

• B.

Ensure minimum pressure in the oil chamber

• C.

Ensure minimum pressure to the condesate drain

• D.

Prevent receiver air from flowing back to the compressor

C. Ensure minimum pressure to the condesate drain
Explanation
The MC-2A rotary sliding vane compressor's minimum pressure valve performs various functions, including ensuring minimum pressure to the felt pads, ensuring minimum pressure in the oil chamber, and preventing receiver air from flowing back to the compressor. However, it does not have a role in ensuring minimum pressure to the condensate drain.

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• 27.

### What medium is used to cool the MC-2A rotary vane compressor?

• A.

Oil

• B.

Air

• C.

Water

• D.

Hydraulic fluid

A. Oil
Explanation
The MC-2A rotary vane compressor is cooled using oil. Oil is commonly used in compressors as a cooling medium because it has good heat transfer properties and can effectively absorb and dissipate heat generated during the compression process. This helps to prevent the compressor from overheating and ensures its efficient operation. Additionally, oil also helps to lubricate the moving parts of the compressor, reducing friction and wear.

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• 28.

### On the MC-2A rotary sliding vane compressor, what forces the oil through the oil cooler?

• A.

Oil pump pressure

• B.

Scavenge pump pressure

• C.

First stage air pressure

• D.

Second stage air pressure

D. Second stage air pressure
Explanation
The second stage air pressure forces the oil through the oil cooler in the MC-2A rotary sliding vane compressor. This is because the air pressure in the second stage creates a pressure differential that pushes the oil through the cooler, allowing it to be cooled before returning to the compressor.

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• 29.

### What is the output of the MC-2A rotary sliding vane compressor?

• A.

High volume, high pressure

• B.

High volume, low pressure

• C.

Low volume, high pressure

• D.

Low volume, low pressure

D. Low volume, low pressure
Explanation
The output of the MC-2A rotary sliding vane compressor is low volume, low pressure. This means that it delivers a relatively small amount of compressed air at a low pressure level.

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• 30.

### The valves on a reciprocating compressor are operated by

• A.

Pushrods

• B.

Air pressure

• C.

Oil pressure

• D.

Electrical input

B. Air pressure
Explanation
The valves on a reciprocating compressor are operated by air pressure. This means that the air pressure within the compressor is used to open and close the valves, allowing the intake and discharge of air. As the air pressure increases, it pushes the valves open, allowing the air to enter or exit the compressor. Conversely, when the air pressure decreases, the valves close, preventing the air from escaping. Therefore, the correct answer is air pressure.

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• 31.

### During a service inspection, the dehydrators of an air compressor should be

• A.

Drained

• B.

Replaced

• C.

Checked for contamination

• D.

Checked for hours since installation

D. Checked for hours since installation
Explanation
During a service inspection, it is important to check the hours since installation of the dehydrators of an air compressor. This is because the dehydrators have a limited lifespan and need to be replaced after a certain number of hours of operation. Checking the hours since installation helps determine if the dehydrators are due for replacement or if they still have some useful life left. It is an essential step to ensure the proper functioning and efficiency of the air compressor system.

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• 32.

### What TO contains the periodic inspection (PE) section?

• A.

Operation and service TO

• B.

Illustrated parts TO

• C.

Lubrication TO

• D.

Overhaul TO

A. Operation and service TO
Explanation
The periodic inspection (PE) section is contained in the Operation and service TO. This TO provides instructions and guidelines for the regular operation and maintenance of the equipment. The periodic inspection section specifically outlines the necessary inspections that need to be carried out at regular intervals to ensure the equipment's proper functioning and identify any potential issues or maintenance requirements.

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• 33.

### To charge the receiver on the MC-2A air compressor, ensure the air control valve is closed and

• A.

Let the engine idle

• B.

• C.

• D.

Open the dehydrator drain valve

C. Close the receiver drain valve
Explanation
To charge the receiver on the MC-2A air compressor, it is necessary to close the receiver drain valve. This is because the receiver drain valve allows any accumulated moisture or condensation to be drained from the receiver. By closing the drain valve, it ensures that the receiver is sealed and ready to be charged with air. This step is important to maintain the efficiency and proper functioning of the air compressor.

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• 34.

### Prior to performing any maintenance on an air compressor airflow system, you should

• A.

• B.

Turn off all switches

• C.

Disconnect the battery

• D.

Relieve all air pressure

D. Relieve all air pressure
Explanation
Before performing any maintenance on an air compressor airflow system, it is important to relieve all air pressure. This is necessary to ensure the safety of the person conducting the maintenance as well as to prevent any potential accidents or injuries. By relieving the air pressure, the risk of sudden release of compressed air is minimized, reducing the chances of accidents or damage to the system. It is a crucial step that should be followed to ensure proper maintenance procedures are carried out safely.

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• 35.

### When analyzing an air compressor malfunction, you prioritize possible causes by

• A.

Starting with the simplest possibilities

• B.

Starting with the last known source of power

• C.

Starting with the most complex possibilities

• D.

Replacing possible malfuntioning components

A. Starting with the simplest possibilities
Explanation
When analyzing an air compressor malfunction, it is best to start with the simplest possibilities as they are often the most common and easiest to fix. By ruling out simple causes first, such as a loose connection or low air pressure, you can quickly identify and resolve the issue without wasting time on more complex possibilities. This approach helps streamline the troubleshooting process and ensures that the problem is resolved efficiently.

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• 36.

### When performing a front end alignment on a nitrogen servicing unit, what component would you adjust to equalize the distance from each steering knuckle king pin to the center of the towbar lunette eye?

• A.

Tie rod ends

• B.

Clevis pins

• C.

Steering knuckle

• D.

Brake cable assembly

A. Tie rod ends
Explanation
When performing a front end alignment on a nitrogen servicing unit, the component that would be adjusted to equalize the distance from each steering knuckle king pin to the center of the towbar lunette eye is the tie rod ends. The tie rod ends connect the steering knuckles to the steering rack, and by adjusting them, the distance from each king pin to the center of the towbar lunette eye can be equalized, ensuring proper alignment and stability of the unit.

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• 37.

### Prior to performing maintenance on a liquid oxygen (LOX) cart you should ensure that

• A.

The brake is holding

• B.

You tools are free of grease and oil and the cart is drained

• C.

That it is parked on asphalt

• D.

The shop doors are closed

B. You tools are free of grease and oil and the cart is drained
Explanation
Before performing maintenance on a liquid oxygen (LOX) cart, it is important to ensure that your tools are free of grease and oil and the cart is drained. This is crucial because LOX is highly reactive and can cause combustion when it comes into contact with flammable substances such as grease and oil. By ensuring that your tools are free of grease and oil, you minimize the risk of accidental ignition. Additionally, draining the cart ensures that there is no residual LOX present, further reducing the risk of combustion during maintenance.

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• 38.

### The self generating nitrogen servicing cart (SGNSC) is categorized as a

• A.

High-pressure air compressor

• B.

Low-pressure air compressor

• C.

High volume air compressor

• D.

Low volume air compressor

A. High-pressure air compressor
Explanation
The self-generating nitrogen servicing cart (SGNSC) is categorized as a high-pressure air compressor because it is designed to generate and deliver nitrogen at high pressures. Unlike low-pressure air compressors, which typically operate at pressures below 100 psi, the SGNSC is capable of producing nitrogen at pressures exceeding 100 psi, making it suitable for high-pressure applications such as aircraft maintenance and servicing. Its ability to generate nitrogen at high pressures allows it to meet the specific requirements of these applications, making it the correct answer choice.

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• 39.

### What component on the self generating nitrogen servicing cart (SGNSC) removes nitrogen from the ambient air?

• A.

Filters

• B.

Carbon absorbers

• C.

Booster compressor

• D.

Seperation membrane

D. Seperation membrane
Explanation
The separation membrane is the component on the self-generating nitrogen servicing cart (SGNSC) that removes nitrogen from the ambient air. A separation membrane is a selective barrier that allows certain molecules or ions to pass through while blocking others. In this case, the separation membrane allows nitrogen to pass through, separating it from the other components present in the ambient air. This process helps in generating pure nitrogen for various applications.

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• 40.

### The proper oil level in the feed air compressor lubricant seperator tank on the self generating nitrogen servicing cart (SGNSC) should be

• A.

2/3 to 3/4 up form the bottom of the sight glass

• B.

2/3 to 3/4 down from the top of the sight glass

• C.

1/2 up form the bottom of the sight glass

• D.

1/2 down form the top of the sight glass

A. 2/3 to 3/4 up form the bottom of the sight glass
Explanation
The proper oil level in the feed air compressor lubricant separator tank on the self-generating nitrogen servicing cart (SGNSC) should be 2/3 to 3/4 up from the bottom of the sight glass. This means that the oil level should be between 2/3 and 3/4 of the total height of the sight glass, measured from the bottom. Maintaining the oil level within this range ensures proper lubrication and functioning of the compressor, preventing any potential damage or malfunction.

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• 41.

### The radiator must be cleaned during a periodic inspection of a self generating nitrogen servicing cart (SGNSC) to

• A.

Remove corrosion

• B.

Prevent corrosion

• C.

• D.

Aid in heat transfer

D. Aid in heat transfer
Explanation
Cleaning the radiator during a periodic inspection of a self-generating nitrogen servicing cart (SGNSC) helps to aid in heat transfer. Over time, the radiator can accumulate dirt, debris, and corrosion, which can hinder the efficient transfer of heat. By cleaning the radiator, any obstructions or build-up can be removed, allowing for better heat dissipation. This ensures that the SGNSC can effectively cool down and operate at optimal temperatures, preventing overheating and potential damage to the system.

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• 42.

### To start the self generating nitrogen servicing cart (SGNSC) the operator must place the ignition switch in the start position for no more than

• A.

5 seconds

• B.

10 seconds

• C.

15 seconds

• D.

20 seconds

B. 10 seconds
Explanation
The correct answer is 10 seconds. This is the maximum amount of time the operator should place the ignition switch in the start position to start the self generating nitrogen servicing cart (SGNSC). Placing the ignition switch in the start position for more than 10 seconds may cause damage or malfunction to the equipment.

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• 43.

### At what storage cylinder pressure should the self generating nitrogen servicing cart (SGNSC) stop producing nitrogen?

• A.

2400 psig

• B.

4100 psig

• C.

4400 psig

• D.

6400 psig

C. 4400 psig
Explanation
The self generating nitrogen servicing cart (SGNSC) should stop producing nitrogen at a storage cylinder pressure of 4400 psig.

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• 44.

### During an operation check of a self generating nitrogen servicing cart (SGNSC) you find that the engine starts, is running at 3.000 revolutions per minute (rpm), but the nitrogen purity does not reach 95.5% within 30 minutes. What is a probable cause of this malfunction?

• A.

Poor air ventilation

• B.

Booster compressor defective

• C.

Low oil level in the feed air compressor lubricant seperator tank

• D.

Warming door is not lowered for cold weather operation conditions

D. Warming door is not lowered for cold weather operation conditions
Explanation
The warming door is responsible for maintaining the temperature inside the SGNSC during cold weather conditions. If the warming door is not lowered, it can result in a drop in temperature inside the cart, causing the nitrogen purity to not reach the required level within the specified time frame. This malfunction is likely due to the failure to lower the warming door for cold weather operation conditions.

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• 45.

### What is important to keep in mind when performing maintenance on the self generating nitrogen servicing cart (SGNSC)?

• A.

Safety

• B.

Ventilation

• C.

Wind Direction

• D.

Weather conditions

A. Safety
Explanation
When performing maintenance on the self generating nitrogen servicing cart (SGNSC), it is important to prioritize safety. This means following proper safety protocols, wearing appropriate protective gear, and being aware of potential hazards. Safety should always be the top priority to prevent accidents or injuries during the maintenance process.

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• 46.

### When filling and bleeding the system of the MJ-2A-1 hydraulic test stand, the reservoir selector valve must be in the

• A.

Open position

• B.

Stand position

• C.

External position

• D.

Aircraft position

D. Aircraft position
Explanation
When filling and bleeding the system of the MJ-2A-1 hydraulic test stand, the reservoir selector valve must be in the aircraft position. This is because the aircraft position allows the hydraulic fluid to flow directly from the aircraft's hydraulic system into the test stand's reservoir. This ensures that the test stand is filled with the same type of hydraulic fluid as the aircraft and allows for accurate testing and troubleshooting of the hydraulic system.

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• 47.

### What component protects the MJ-2A-1 hydraulic test stand from overpressurization when the unit is not operating?

• A.

High pressure relief valve

• B.

Thermal relief valve

• C.

Check/relief valve

• D.

Fill relief valve

B. Thermal relief valve
Explanation
The thermal relief valve is designed to protect the hydraulic test stand from overpressurization when the unit is not operating. It is specifically designed to relieve excess pressure caused by thermal expansion of the hydraulic fluid. When the temperature of the fluid exceeds a certain threshold, the thermal relief valve opens, allowing the excess pressure to escape and preventing damage to the test stand.

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• 48.

### The purpose of the low pressure pump on the MJ-2A-1 is to ensure a constant flow of fluid to the

• A.

Relief valves

• B.

Aircraft pumps

• C.

High pressure pump

• D.

Low pressure filters

C. 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 consistent supply of fluid in order to function properly and generate the necessary pressure for the system. The low pressure pump helps to maintain this flow by providing a steady stream of fluid to the high pressure pump, ensuring its continuous operation.

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• 49.

### In the MJ-2A-1 hydraulic test stand, the output volume of the high pressure pump is controlled by the

• A.

Volume control

• B.

Flowmeter assembly

• C.

Flow control valve

• D.

Angle of the camplate

A. Volume control
Explanation
The correct answer is volume control. In the MJ-2A-1 hydraulic test stand, the output volume of the high pressure pump is controlled by the volume control. This means that the volume of fluid being pumped out by the pump can be adjusted or regulated using the volume control mechanism. This allows for precise control over the amount of fluid being delivered, which is important in hydraulic systems to ensure proper functioning and avoid damage or inefficiencies.

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• 50.

### The flowmeter on a MJ-2A-1 hydraulic test stand shows fluid

• A.

Flow in the return system

• B.

Pressure in the return system

• C.

Flow in the high pressure system

• D.

Pressure in the high pressure system

A. Flow in the return system
Explanation
The flowmeter on a MJ-2A-1 hydraulic test stand shows fluid flow in the return system. This means that the flowmeter is measuring the rate at which the fluid is returning back to the system after being used. It provides information on the flow rate in the return system, allowing for monitoring and control of the fluid flow in that particular system.

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• Current Version
• Mar 20, 2023
Quiz Edited by
ProProfs Editorial Team
• Oct 31, 2010
Quiz Created by
Jnjnils

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