2A654 CDC All UREs (100 Questions)
All the UREs of CDC 2A654. There are 280 questions but it will pick a random 100 for you to answer.
- 1.
What type of fuel pumps are used for engine feed in the forward and AFT reservoir tanks of a fighter aircraft?
- A.
Single-impeller, turbine-driven
- B.
Single-impeller, electrically driven
- C.
Dual-impeller, turbine-driven
- D.
Dual-impeller, electrically driven
Correct Answer
D. Dual-impeller, electrically drivenExplanation
Dual-impeller, electrically driven fuel pumps are used for engine feed in the forward and AFT reservoir tanks of a fighter aircraft. These pumps have two impellers, which allow for increased fuel flow and pressure. The electrically driven mechanism ensures reliable and consistent operation of the pumps. This type of fuel pump is commonly used in aircraft to ensure a steady supply of fuel to the engines, which is crucial for their performance and safety.Rate this question:
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- 2.
What type valve is the crossfeed valve in a fighter aircraft?
- A.
Fuel pressure-operated gate
- B.
Hydraulic-operated gate
- C.
Motor-operated butterfly
- D.
Solenoid-operated butterfly
Correct Answer
A. Fuel pressure-operated gateExplanation
The crossfeed valve in a fighter aircraft is a fuel pressure-operated gate. This means that it is controlled by the fuel pressure in the aircraft's fuel system. The valve allows fuel to be transferred between different fuel tanks in order to balance the aircraft's weight and ensure proper fuel flow to the engines. The fuel pressure-operated gate design ensures that the valve opens and closes based on the fuel pressure, allowing for efficient and reliable fuel transfer.Rate this question:
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- 3.
What position would you place the ENGINE FEED switch in order to correct a fuel imbalance caused by to much fuel in the forward fuel system of a fighter aircraft?
- A.
AFT
- B.
FWD
- C.
BALANCE
- D.
NORMAL
Correct Answer
B. FWDExplanation
To correct a fuel imbalance caused by too much fuel in the forward fuel system of a fighter aircraft, the ENGINE FEED switch should be placed in the FWD position. This means that the fuel will be directed to the aft fuel system, helping to balance out the fuel distribution and correct the imbalance.Rate this question:
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- 4.
What tanks must be operating to use body tank fuel to feed the engines on a tanker aircraft?
- A.
Air refueling
- B.
Alternate
- C.
Main tank
- D.
Override
Correct Answer
A. Air refuelingExplanation
To use body tank fuel to feed the engines on a tanker aircraft, air refueling tanks must be operating. Air refueling allows the tanker aircraft to receive fuel from another aircraft while in flight, enabling it to transfer fuel from its body tanks to the engines. This process ensures a continuous fuel supply for the engines, extending the aircraft's range and endurance.Rate this question:
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- 5.
What valves must be open to feed all engines from the center wing tank on a tanker aircraft?
- A.
Air refueling to engine manifold
- B.
Gravity feed
- C.
Tank to manifold
- D.
Override wing
Correct Answer
C. Tank to manifoldExplanation
The valves that must be open to feed all engines from the center wing tank on a tanker aircraft are the tank to manifold valves. These valves allow the fuel from the center wing tank to flow into the engine manifold, which then distributes the fuel to all the engines. This ensures that all engines receive fuel from the center wing tank, allowing for efficient fuel distribution during air refueling operations.Rate this question:
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- 6.
What causes fuel to transfer from the reserve tank on a tanker aircraft during flight?
- A.
Air pressure
- B.
Boost pump pressure
- C.
Gravity
- D.
Override pump pressure
Correct Answer
C. GravityExplanation
Fuel transfers from the reserve tank on a tanker aircraft during flight due to gravity. Gravity causes the fuel to flow from a higher location (the reserve tank) to a lower location (the main tank). This natural force allows for the transfer of fuel without the need for additional mechanisms or external pressure.Rate this question:
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- 7.
Why is the output pressure and the flow ratings of a centrifugal pump greater then the amount the system needs?
- A.
Provide fuel to the engines during negative gravity or inverted flight conditions.
- B.
Prevent reverse flow of fuel from a pump with a greater pressure output.
- C.
Prevent fuel boiling and evaporation in the wing tanks at high altitudes.
- D.
Provide an ample supply of fuel in case of a single pump failure.
Correct Answer
D. Provide an ample supply of fuel in case of a single pump failure.Explanation
The output pressure and flow ratings of a centrifugal pump are greater than the amount the system needs in order to provide an ample supply of fuel in case of a single pump failure. This ensures that even if one pump fails, there is still enough fuel being supplied to the engines.Rate this question:
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- 8.
What type of centrifugal pump is used when fuel supply is required during negative gravity conditions?
- A.
In-line ejector
- B.
Dual-impeller
- C.
Rotary-vane
- D.
Top-mounted
Correct Answer
B. Dual-impellerExplanation
A dual-impeller centrifugal pump is used when fuel supply is required during negative gravity conditions. This type of pump is designed with two impellers that rotate in opposite directions, creating a more balanced and stable flow of fuel. The dual-impeller design allows the pump to overcome the challenges of negative gravity conditions and effectively deliver fuel in these situations.Rate this question:
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- 9.
What item prevents foreign objects from holding the bypass valve open in a dual-impeller pump?
- A.
An inlet screen
- B.
An in-line filter
- C.
A one-way check valve
- D.
A two-way check valve
Correct Answer
A. An inlet screenExplanation
An inlet screen is a device that is placed at the inlet of a pump to prevent foreign objects from entering the pump and causing damage. It acts as a barrier, allowing only clean fluid to pass through while blocking any debris or foreign objects. In the context of a dual-impeller pump, the inlet screen plays a crucial role in preventing foreign objects from holding the bypass valve open. By filtering out any unwanted particles, the inlet screen ensures that the bypass valve remains closed and the pump operates efficiently without any obstruction.Rate this question:
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- 10.
What does the arrow stamped on the body of a check valve indicate?
- A.
Valve installation position to prevent air entrapment
- B.
Location of manufactures data block
- C.
Direction of fuel flow
- D.
Direction of by-pass fuel flow
Correct Answer
C. Direction of fuel flowExplanation
The arrow stamped on the body of a check valve indicates the direction of fuel flow. This arrow serves as a visual indicator for the correct orientation of the valve, ensuring that fuel flows in the intended direction and preventing any potential issues or malfunctions.Rate this question:
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- 11.
What feature prevents excess pressure from building up in trapped lines or within the body of a sliding gate valve?
- A.
One-way check valves
- B.
Spring-loaded check valves
- C.
Pressure relief valve
- D.
Thermal relief valve
Correct Answer
D. Thermal relief valveExplanation
A thermal relief valve is designed to prevent excess pressure from building up in trapped lines or within the body of a sliding gate valve by releasing the pressure when it reaches a certain temperature. This is important because excessive pressure can cause damage to the valve or the system it is connected to. By automatically relieving the pressure, the thermal relief valve helps to maintain the integrity and safety of the system.Rate this question:
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- 12.
What type of seal is between the disc and the valve body on a disc-type valve?
- A.
O-ring
- B.
V-ring
- C.
Gasket
- D.
Metal-to-Metal
Correct Answer
A. O-ringExplanation
The correct answer is O-ring. An O-ring is a type of seal that is commonly used between the disc and the valve body on a disc-type valve. It is a circular rubber ring that is placed in a groove to create a tight seal and prevent any leakage. O-rings are known for their flexibility, durability, and resistance to various fluids and temperatures, making them an ideal choice for sealing applications in valves.Rate this question:
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- 13.
The best method for troubleshooting a fighter engine feed system component you suspect of leaking is to
- A.
Operate the component and check for leaks.
- B.
Pressurize the manifold with air and check for leaks.
- C.
Pressurize the manifold with fuel and check for leaks.
- D.
Stand test with fuel for 30 minutes and listen for leaks.
Correct Answer
C. Pressurize the manifold with fuel and check for leaks. -
- 14.
What is first checked when operating a boost pump problem on a fighter aircraft?
- A.
Continuity across the pressure switch
- B.
Direct fuel pressure reading of the pump
- C.
Fuel pressure switch reading
- D.
Power to the boost pump
Correct Answer
B. Direct fuel pressure reading of the pumpExplanation
When operating a boost pump on a fighter aircraft, the first thing that is checked is the direct fuel pressure reading of the pump. This is important because it ensures that the pump is functioning properly and providing the necessary fuel pressure for the aircraft's engine. By checking the direct fuel pressure reading, any potential issues or malfunctions with the pump can be identified and addressed before further operations.Rate this question:
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- 15.
On a tanker aircraft, what prevents the engine from running out of fuel and flaming out if its main tank is hit by small arms fire?
- A.
Automatic fuel monitoring system
- B.
Engine flameout protection device
- C.
Crossfeed system
- D.
Fuel tank and engine sensing device
Correct Answer
C. Crossfeed systemExplanation
The crossfeed system allows fuel to be transferred from one tank to another, ensuring that the engine always has access to fuel even if the main tank is hit by small arms fire. This prevents the engine from running out of fuel and flaming out.Rate this question:
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- 16.
You are troubleshooting a malfunction of the crossfeed system on a tanker aircraft when you determine the is no pressure available to route fuel to the crossfeed manifold. The most probable cause of this malfunction is
- A.
A malfunctioning boost pump.
- B.
FOD stuck in a shutoff valve.
- C.
An inoperative pressure transmitter.
- D.
A stuck open check valve.
Correct Answer
A. A malfunctioning boost pump.Explanation
The most probable cause of the malfunction in the crossfeed system is a malfunctioning boost pump. The boost pump is responsible for providing pressure to route fuel to the crossfeed manifold. If the boost pump is not functioning properly, there will be no pressure available, leading to the malfunction. The other options, such as FOD stuck in a shutoff valve, an inoperative pressure transmitter, or a stuck open check valve, may also cause issues in the fuel system but are less likely to be the main cause of the pressure loss in this specific scenario.Rate this question:
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- 17.
What is the most probable cause when a circuit breaker for a shutoff valve continues to "pop?"
- A.
An open in the shut off valve circuit
- B.
A defective circuit breaker
- C.
Too much pressure in the system
- D.
The valve motor has shorted out
Correct Answer
D. The valve motor has shorted outExplanation
The most probable cause when a circuit breaker for a shutoff valve continues to "pop" is that the valve motor has shorted out. This means that there is a fault in the motor, causing it to draw excessive current and triggering the circuit breaker to trip. This can happen due to various reasons such as a wiring issue, a malfunctioning motor, or a mechanical problem within the motor itself. In any case, the short circuit in the valve motor needs to be addressed and repaired to prevent further tripping of the circuit breaker.Rate this question:
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- 18.
What is the purpose of the power transfer method of transferring fuel on a fighter jet?
- A.
Pressurize and scavenge the tanks
- B.
Augment fuel transfer and scavenge the tanks
- C.
Pressurize the tanks
- D.
Augment fuel transfer
Correct Answer
B. Augment fuel transfer and scavenge the tanksExplanation
The purpose of the power transfer method of transferring fuel on a fighter jet is to augment fuel transfer and scavenge the tanks. This means that the power transfer method not only helps in transferring fuel from one tank to another, but it also assists in removing any excess fuel or contaminants from the tanks. By augmenting the fuel transfer process and scavenging the tanks, the power transfer method ensures efficient and effective fuel management on the fighter jet.Rate this question:
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- 19.
How many boost pumps are used on a fighter aircraft power transfer system?
- A.
2
- B.
4
- C.
6
- D.
8
Correct Answer
C. 6Explanation
Fighter aircraft power transfer systems typically use six boost pumps. These boost pumps are responsible for transferring fuel from the aircraft's fuel tanks to the engine. Having multiple boost pumps ensures a reliable and continuous fuel supply to the engine, which is crucial for the aircraft's performance and safety during flight.Rate this question:
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- 20.
Which fuel tanks will transfer fuel first in a fighter aircraft?
- A.
External centerline
- B.
Left wing external
- C.
Right wing external
- D.
Left and right wing external
Correct Answer
A. External centerlineExplanation
The external centerline fuel tank will transfer fuel first in a fighter aircraft. This is because the external centerline tank is typically the largest and is located in the centerline of the aircraft, making it the most accessible and efficient for fuel transfer. Additionally, the centerline tank is often designed to be the primary fuel source, providing fuel to the aircraft's engines during critical phases of flight.Rate this question:
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- 21.
You are troubleshooting a problem on a fighter aircraft. You find that none of the external tanks transferred fuel with the selection switch in the NORM position; however, the external wing tanks did transfer fuel with the switch in the WING FIRST position. The most probable cause of this malfunction is
- A.
Centerline refuel/transfer valve is inoperative.
- B.
External vent and pressurization valve is bad.
- C.
External transfer shutoff valve is bad.
- D.
Inoperative wing float valve.
Correct Answer
A. Centerline refuel/transfer valve is inoperative.Explanation
The most probable cause of the malfunction described is that the centerline refuel/transfer valve is inoperative. This is indicated by the fact that fuel is not transferring when the selection switch is in the NORM position, but transfers successfully when in the WING FIRST position. This suggests that there is an issue specifically with the centerline refuel/transfer valve, which is responsible for transferring fuel from the external tanks.Rate this question:
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- 22.
How is the fuel level control valve on a cargo aircraft operated and controlled respectively?
- A.
Solenoid/manually
- B.
Hydro mechanically/solenoid
- C.
Fuel pressure/solenoid
- D.
Hydro mechanically/fuel pressure
Correct Answer
B. Hydro mechanically/solenoidExplanation
The fuel level control valve on a cargo aircraft is operated and controlled using a hydro mechanical system and a solenoid. The hydro mechanical system is responsible for controlling the flow of fuel, while the solenoid is used to activate and deactivate the valve. This combination allows for precise control over the fuel level in the aircraft, ensuring efficient and safe operation.Rate this question:
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- 23.
What cargo aircraft component is designed to sense fuel pressure and transmit a signal to an indicator on the fuel management panel to allow determination of the boost pump output pressure?
- A.
Pressure sensing element
- B.
Pressure transmitter
- C.
Pressure switch
- D.
Pressure gauge
Correct Answer
B. Pressure transmitterExplanation
A pressure transmitter is a component that is designed to sense fuel pressure and transmit a signal to an indicator on the fuel management panel. This allows for the determination of the boost pump output pressure. A pressure sensing element is a general term that refers to any component that can sense pressure, but it does not necessarily transmit a signal. A pressure switch is a component that is designed to open or close an electrical circuit based on pressure, but it does not transmit a signal for determining boost pump output pressure. A pressure gauge is a device that visually displays pressure, but it does not transmit a signal for determining boost pump output pressure. Therefore, the correct answer is pressure transmitter.Rate this question:
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- 24.
Which indication shows that a boost pump on a cargo aircraft is putting out sufficient pressure?
- A.
PRESS LOW light goes off
- B.
PRESS LOW light illuminates
- C.
Pressure indicator reads 16 psi
- D.
Pressure indicator reads 20 psi
Correct Answer
A. PRESS LOW light goes offExplanation
When the PRESS LOW light goes off, it indicates that the boost pump on the cargo aircraft is putting out sufficient pressure. This means that the pressure being generated is enough to meet the required levels, and there is no need for concern regarding low pressure.Rate this question:
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- 25.
TO prevent the introduction of foreign objects into the fuel transfer system of a cargo aircraft, the jettison mast is equipped with a
- A.
Flapper.
- B.
Check valve.
- C.
Safety wire device.
- D.
Flame arrester screen.
Correct Answer
D. Flame arrester screen.Explanation
The jettison mast is a component of the fuel transfer system in a cargo aircraft. Its purpose is to allow the aircraft to jettison or release fuel in emergency situations. To prevent foreign objects from entering the fuel transfer system through the jettison mast, a flame arrester screen is installed. This screen acts as a barrier, allowing fuel to pass through while preventing any foreign objects or flames from entering the system. This helps maintain the safety and integrity of the fuel transfer process.Rate this question:
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- 26.
Which kind of fuel valves control the flow of fuel through the jettison system?
- A.
Transfer
- B.
Refuel
- C.
Dump
- D.
Vent
Correct Answer
C. DumpExplanation
Dump fuel valves control the flow of fuel through the jettison system. These valves are specifically designed to release or dump excess fuel from the aircraft's fuel tanks. This is typically done in emergency situations or when the aircraft needs to reduce its weight for landing. Dumping fuel helps to ensure that the aircraft remains within safe weight limits and reduces the risk of damage to the aircraft during landing.Rate this question:
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- 27.
What safety feature in the bomber aircraft fuel jettison system prevents the accidental loss of fuel while the aircraft is on the ground?
- A.
The DUMP switch cover is safety-wired closed.
- B.
The DUMP switch is spring loaded to the OFF position.
- C.
The landing gear must be in the airborne position.
- D.
A shorting plug must be connected for the dump valve to open.
Correct Answer
C. The landing gear must be in the airborne position.Explanation
The correct answer is that the landing gear must be in the airborne position. This safety feature ensures that the fuel jettison system is only activated when the aircraft is in the air, preventing accidental loss of fuel while on the ground. By requiring the landing gear to be in the airborne position, it ensures that the system is not inadvertently activated during ground operations, reducing the risk of fuel loss and potential hazards.Rate this question:
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- 28.
In addition to the dump valve, which valve(s) on a bomber aircraft must be open to allow fuel into the wing transfer lines to be dumped overboard?
- A.
Ballast tank isolation valve
- B.
Forward weapons bay vent disconnect valve
- C.
Ballast tank isolation valve and forward weapons bay vent disconnect valve
- D.
Main pressure actuated vent valve and forward weapons bay vent disconnect valve
Correct Answer
A. Ballast tank isolation valveExplanation
The ballast tank isolation valve must be open in order to allow fuel into the wing transfer lines to be dumped overboard.Rate this question:
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- 29.
Which would most likely be used to control the automatic pump shutoff, when all fuel is depleted from a fuel tank?
- A.
Pressure switch
- B.
Toggle switch
- C.
Float switch
- D.
Float valve
Correct Answer
C. Float switchExplanation
A float switch is a device that is commonly used to control the automatic pump shutoff when all fuel is depleted from a fuel tank. This switch consists of a float that rises and falls with the fuel level. When the fuel level drops below a certain point, the float switch is triggered and sends a signal to the pump to shut off, preventing the pump from running dry and causing damage. Therefore, a float switch is the most likely choice for controlling the automatic pump shutoff in this scenario.Rate this question:
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- 30.
Refueling by using the fuel-level control valves is a much safer operation than filler neck refueling because the valves will
- A.
Provide an automatic refueling of a tank to any desired level.
- B.
Automatically stop the flow of fuel into a tank prior to overflow.
- C.
Signal the refueling monitor when to stop the fuel flow.
- D.
Shut down the refueling vehicle if the tanks start to overflow.
Correct Answer
B. Automatically stop the flow of fuel into a tank prior to overflow.Explanation
The correct answer is "automatically stop the flow of fuel into a tank prior to overflow." This is because fuel-level control valves are designed to prevent overfilling of the tank by automatically shutting off the flow of fuel once the desired level is reached. This helps to prevent spills, leaks, and potential hazards associated with overfilling the tank.Rate this question:
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- 31.
What principle is used to control the fuel-level control valve?
- A.
Pneumatic-electrical
- B.
Electrical-mechanical
- C.
Pneumatic-mechanical
- D.
Hydro mechanical
Correct Answer
D. Hydro mechanicalExplanation
The principle used to control the fuel-level control valve is hydro mechanical. This means that the control valve is operated by a combination of hydraulic and mechanical forces. The hydraulic system provides the necessary pressure and fluid flow to control the valve, while the mechanical components ensure precise and reliable operation.Rate this question:
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- 32.
What part of a piston-type fuel-level control valve prevents fuel from entering the tank?
- A.
A spring
- B.
The float
- C.
A pilot valve
- D.
The diaphragm
Correct Answer
C. A pilot valveExplanation
The pilot valve is the part of a piston-type fuel-level control valve that prevents fuel from entering the tank. It is designed to regulate the flow of fuel and ensure that only the required amount enters the tank. The pilot valve acts as a gatekeeper, opening and closing to control the fuel flow and maintain the desired fuel level. Without the pilot valve, fuel would freely enter the tank, causing potential overflow and other fuel-related issues.Rate this question:
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- 33.
Approximately how much air space is left at the top of the fuel tanks of a cargo aircraft after ground refueling?
- A.
1%
- B.
3%
- C.
5%
- D.
7%
Correct Answer
B. 3%Explanation
After ground refueling, there is approximately 3% air space left at the top of the fuel tanks of a cargo aircraft. This means that the tanks are filled up to 97% of their total capacity, leaving a small amount of space for expansion of the fuel due to temperature changes or other factors. This ensures that there is enough room for the fuel to expand without causing any damage to the tanks or the aircraft.Rate this question:
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- 34.
Which cargo aircraft components should be operationally checked during the first few minutes of ground refueling?
- A.
Single point receptacle drain pump and valve
- B.
Refueling isolation shutoff valves
- C.
Fuel-level control valves
- D.
Separation shutoff valves
Correct Answer
C. Fuel-level control valvesExplanation
During the first few minutes of ground refueling, it is important to operationally check the fuel-level control valves in a cargo aircraft. These valves are responsible for controlling the fuel level in the aircraft's fuel tanks. By checking these valves, the operator can ensure that they are functioning properly and that the fuel level is being accurately controlled during the refueling process. This is crucial to prevent any potential fuel leaks or overflows, ensuring the safety and efficiency of the refueling operation.Rate this question:
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- 35.
During refueling on a fighter aircraft, fuel was vented overboard the refueling operation would not stop. The most probable cause of the is an inoperative
- A.
Refuel/transfer float valve
- B.
Refuel shutoff valve
- C.
Selective refueling shutoff valve
- D.
Refuel/transfer control valve
Correct Answer
B. Refuel shutoff valveExplanation
The most probable cause of the fuel venting overboard during refueling on a fighter aircraft is an inoperative refuel shutoff valve. This valve is responsible for stopping the flow of fuel during refueling operations. If it is not functioning properly, it would not be able to shut off the fuel flow, resulting in the fuel being vented overboard instead of being transferred into the aircraft's tanks.Rate this question:
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- 36.
What light on a bomber aircraft aerial refueling system if all conditions are satisfied prior to boom and receptacle connection?
- A.
Amber DISC light
- B.
Blue STATUS light
- C.
Green LATCHED light
- D.
Blue READY/NWS light
Correct Answer
D. Blue READY/NWS lightExplanation
The blue READY/NWS light indicates that all conditions are satisfied prior to boom and receptacle connection on a bomber aircraft aerial refueling system. This light serves as an indication that the aircraft is ready for the refueling process to commence.Rate this question:
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- 37.
The aerial refueling circuitry on a bomber aerial refueling system is energized by the cam-operated aerial refuel
- A.
Master switch.
- B.
Pressure switch.
- C.
Pull-to-refuel switch.
- D.
Pull-to-refuel-handle.
Correct Answer
C. Pull-to-refuel switch.Explanation
The correct answer is the pull-to-refuel switch. This switch is responsible for energizing the aerial refueling circuitry on a bomber aerial refueling system. It allows the pilot or operator to initiate the refueling process by activating the necessary systems and controls. The pull-to-refuel switch is designed to be easily accessible and operated, making it a convenient choice for initiating the refueling process.Rate this question:
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- 38.
What action(s) will generate command output signals from the electrical multiplex bus (EMUX) and energize the aerial refuel power supply on a bomber aircraft?
- A.
Pushing up on the PULL REFUEL T-handle and placing the MODE switch in the NORM position.
- B.
Pulling down on the PULL REFUEL T-handle and placing the MODE switch in the NORM position.
- C.
Pulling down on the PULL REFUEL T-handle.
- D.
Place the MODE switch in the NORM position.
Correct Answer
B. Pulling down on the PULL REFUEL T-handle and placing the MODE switch in the NORM position. -
- 39.
Which condition will result in an automatic disconnect of the boom and receptacle during aerial refueling on a bomber aircraft?
- A.
Boom travel limits are exceeded
- B.
Reset trigger on pilot's stick is pressed
- C.
Low pressure condition exists
- D.
Fuel center of gravity is off balance
Correct Answer
A. Boom travel limits are exceededExplanation
If the boom travel limits are exceeded during aerial refueling on a bomber aircraft, it will result in an automatic disconnect of the boom and receptacle. This is because exceeding the boom travel limits can potentially cause damage to the equipment or compromise the safety of the refueling operation. Therefore, to prevent any further risks or accidents, the system automatically disconnects the boom and receptacle.Rate this question:
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- 40.
A manual disconnect of the tanker and receiver on a bomber aircraft has been accomplished. What action will reset the Universal Aerial Refueling Receptacle Slipway Instillation (UARRSI) and signal amplifier, causing the READY/NWS light to illuminate?
- A.
Cycling the slipway to closed and open.
- B.
Pressing the aerial refueling RESET button.
- C.
Placing the pilot trigger switch to the first detent.
- D.
Placing the MODE switch to the NORM position.
Correct Answer
C. Placing the pilot trigger switch to the first detent.Explanation
Placing the pilot trigger switch to the first detent will reset the Universal Aerial Refueling Receptacle Slipway Instillation (UARRSI) and signal amplifier, causing the READY/NWS light to illuminate. This action activates the system and prepares it for aerial refueling operations.Rate this question:
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- 41.
You are troubleshooting a malfunction in a bomber aerial refueling system. The fault code of the malfunction is 28-25-AM. What does the letter A indicate?
- A.
The faulty component within the system
- B.
Corrective action required to fix the problem
- C.
The faulty system or subsystem
- D.
A fault isolation diagram is provided
Correct Answer
D. A fault isolation diagram is providedExplanation
The letter A in the fault code 28-25-AM indicates that a fault isolation diagram is provided. This means that there is a diagram available that can help in identifying and isolating the specific fault within the bomber aerial refueling system. The fault isolation diagram can provide visual guidance and instructions on how to troubleshoot and fix the malfunction.Rate this question:
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- 42.
You are troubleshooting a problem on a bomber aircraft. At a certain point, the fault isolation diagram requests that you enter a parameter monitor code (PMC). To comply with the request you would enter the code on the
- A.
System status panel in the aft crew station.
- B.
System status panel on the windshield center post.
- C.
CITS control and display panel on the windshield center post.
- D.
CITS control and display panel in the aft crew station.
Correct Answer
D. CITS control and display panel in the aft crew station. -
- 43.
What is the purpose of the tank scavenge system on a cargo aircraft?
- A.
Drain fuel from the low sump areas of the tank.
- B.
Reduce the amount of unusable fuel in the tank.
- C.
Prevent the vent boxes from venting fuel overboard.
- D.
Ensure an un interrupted flow of fuel to the engines.
Correct Answer
D. Ensure an un interrupted flow of fuel to the engines.Explanation
The purpose of the tank scavenge system on a cargo aircraft is to ensure an uninterrupted flow of fuel to the engines. This system helps to prevent fuel starvation by removing any trapped or low-level fuel from the tanks and delivering it to the engines. By doing so, it maximizes the usable fuel and helps maintain a consistent fuel supply to the engines, thus ensuring their continuous operation without interruption.Rate this question:
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- 44.
What type displacement jet/ejector pumps are in the tank scavenge system of a cargo aircraft?
- A.
Constant
- B.
Positive
- C.
Variable
- D.
Venturi
Correct Answer
C. VariableExplanation
Variable displacement jet/ejector pumps are used in the tank scavenge system of a cargo aircraft. These pumps are designed to vary the amount of fluid they displace based on the demand of the system. This allows for efficient operation and control of the tank scavenge system, as the pump can adjust its output to match the needs of the aircraft. By varying the displacement, the pump can ensure that the tank scavenge system is effectively removing fuel or other fluids from the tanks, maintaining proper levels and preventing overflow or underfilling.Rate this question:
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- 45.
Combined with the ejector pumps, what cargo aircraft components keep the boost pump inlet submerged in fuel at all times?
- A.
Vent box
- B.
Float valve
- C.
Surge box
- D.
Check valve
Correct Answer
C. Surge boxExplanation
The surge box, when combined with ejector pumps, helps to keep the boost pump inlet submerged in fuel at all times. The surge box is a component that helps regulate the flow of fuel and prevents any surges or fluctuations in fuel pressure. By maintaining a consistent level of fuel around the boost pump inlet, it ensures that the pump can function properly and prevents any air from entering the system.Rate this question:
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- 46.
You can determine whether the tank scavenge system on cargo aircraft is operating properly by checking the
- A.
Fuel quantity indicators
- B.
Sump low lights
- C.
Fuel pressure indicators and the fuel quantity indicators
- D.
Sump low lights and fuel quantity indicators
Correct Answer
D. Sump low lights and fuel quantity indicatorsExplanation
To determine whether the tank scavenge system on a cargo aircraft is operating properly, two indicators need to be checked: the sump low lights and the fuel quantity indicators. The sump low lights indicate if there is any excessive accumulation of fuel in the sumps, which could indicate a problem with the scavenge system. Additionally, the fuel quantity indicators provide information on the amount of fuel in the tanks, allowing for a comparison with the expected values. By checking both indicators, it is possible to assess the functionality of the tank scavenge system.Rate this question:
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- 47.
On a cargo aircraft, how much fuel must be present in a tank to perform a scavenge system operational check?
- A.
6,000 lbs
- B.
12,000 lbs
- C.
18,000 lbs
- D.
24,000 lbs
Correct Answer
B. 12,000 lbsExplanation
The scavenge system is used to transfer fuel from one tank to another in order to maintain balance and prevent fuel imbalance. To perform an operational check of the scavenge system, a sufficient amount of fuel must be present in the tank. The correct answer of 12,000 lbs indicates that this is the minimum amount of fuel required for the scavenge system operational check to be performed effectively.Rate this question:
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- 48.
Which situation will cause the tank scavenge system's ejector pumps to not operate at full efficiency?
- A.
Trapped fuel in surge box.
- B.
Boost pump inlet screen clogged.
- C.
Jet pump control inoperative.
- D.
Low boost pump pressure.
Correct Answer
B. Boost pump inlet screen clogged.Explanation
If the boost pump inlet screen is clogged, it will restrict the flow of fuel into the ejector pumps, causing them to not operate at full efficiency. The boost pump is responsible for supplying fuel to the ejector pumps, so if its inlet screen is blocked, it will result in reduced fuel flow and decreased efficiency of the ejector pumps.Rate this question:
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- 49.
What effect, if any, would a missing flapper valve have on the operation of the tank scavenge system?
- A.
None.
- B.
Undesired fuel would flow into the sump box.
- C.
Fuel would be allowed to flow out of the surge box.
- D.
Fuel would be stuck in the sump box.
Correct Answer
C. Fuel would be allowed to flow out of the surge box.Explanation
If the flapper valve is missing in the tank scavenge system, it would allow fuel to flow out of the surge box. The flapper valve is responsible for regulating the flow of fuel in the system and preventing it from flowing out of the surge box. Without the valve, there would be no restriction on the fuel flow, leading to fuel escaping from the surge box.Rate this question:
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- 50.
How is fuel drained from the main wing manifold of a cargo aircraft after a defuel operation?
- A.
Rotary vane pump
- B.
Gravity flow
- C.
Poppet drain valve
- D.
Ejector pump
Correct Answer
B. Gravity flowExplanation
After a defuel operation, fuel is drained from the main wing manifold of a cargo aircraft through gravity flow. This means that the fuel is allowed to flow naturally downwards due to the force of gravity, without the need for any additional pumps or valves. This method is commonly used as it is simple, efficient, and does not require any additional equipment or power source.Rate this question:
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Current Version
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Mar 19, 2023Quiz Edited by
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Jan 06, 2016Quiz Created by
Cmteg1
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