2A654 CDC All UREs

280 Questions | Total Attempts: 1741

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2A654 CDC All UREs - Quiz

All the UREs of CDC 2A654.


Questions and Answers
  • 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

  • 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

  • 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

  • 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

  • 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

  • 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

  • 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.

  • 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

  • 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

  • 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

  • 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

  • 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

  • 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.

  • 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

  • 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

  • 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.

  • 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

  • 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

  • 19. 
    How many boost pumps are used on a fighter aircraft power transfer system?
    • A. 

      2

    • B. 

      4

    • C. 

      6

    • D. 

      8

  • 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

  • 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.

  • 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

  • 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

  • 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

  • 25. 
    Which kind of fuel valves control the flow of fuel through the jettison system?
    • A. 

      Transfer

    • B. 

      Refuel

    • C. 

      Dump

    • D. 

      Vent

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