Volume 2 2A651 CDC ( Q 16-44 )

29 Questions | Total Attempts: 110

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CDC Quizzes & Trivia

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Questions and Answers
  • 1. 
    The three major sections of all jet engines are compressor, combustion,and
    • A. 

      Turbo.

    • B. 

      Turbine.

    • C. 

      Exhaust.

    • D. 

      Diffuser.

  • 2. 
    Vane-type fuel pumps used in jet engines are similar to
    • A. 

      Sliding-vane air compressors.

    • B. 

      Piston pump air compressors.

    • C. 

      Roots air compressors.

    • D. 

      Turbo-superchargers.

  • 3. 
    The two forces that air is subjected to after it is drawn into the guid vanes of a centrifugal commpressor are
    • A. 

      Rotational and centrifugal.

    • B. 

      Rotational and tangential.

    • C. 

      Tangential and centrifugal.

    • D. 

      Tangential and radial

  • 4. 
    A constuctional feature of the centrifugal compressor is that the impeller
    • A. 

      Has two matching lpates.

    • B. 

      Has a lighweight design.

    • C. 

      Is forged as a single unit.

    • D. 

      Is constructed in rows of blades and stators.

  • 5. 
    The forward end of the shaft on a centrifugal compressor is hollow in order to
    • A. 

      Act as a vibration damper.

    • B. 

      Allow cooling air to the turbine.

    • C. 

      Provide a passage for lubricating oil.

    • D. 

      Provide a passage for the main fuel supply.

  • 6. 
    Stationary vanes positioned between rotor discs in a compressor are used to
    • A. 

      Direct air and increase pressure.

    • B. 

      Direct hot gases rearward.

    • C. 

      Increase backup pressure.

    • D. 

      Prolong compressor life.

  • 7. 
    In a dual-spool compressor,rpm of the N2 compressor are determined by the
    • A. 

      Starter.

    • B. 

      Fuel pump.

    • C. 

      Fuel control.

    • D. 

      Low-pressure turbine.

    • E. 

      Beer

  • 8. 
    Which facet of engine design helps prevent igniter plug fouling?
    • A. 

      Gold plating on the plug.

    • B. 

      Split electrode on the plug.

    • C. 

      Ceramic coating on the plug.

    • D. 

      Directing air around the plug.

  • 9. 
    The excess airflow that is not burned in the combustion section is used to
    • A. 

      Cool the burner surfaces.

    • B. 

      Operate pneumatic accessories

    • C. 

      Decrease the mass of exhaust gases.

    • D. 

      Increase air in the compressor section.

  • 10. 
    Fuel that accumulates after a failed start is
    • A. 

      Returned to the fuel control by tubes.

    • B. 

      Drained overboard by a drain system.

    • C. 

      Burned on the next start attempt.

    • D. 

      Allowed to evaporate.

  • 11. 
    The parts on a can-annular combustion section must be removed in a specific order because of the
    • A. 

      Fuel nozzle.

    • B. 

      Transition liner.

    • C. 

      Combustion chamber outer case.

    • D. 

      Combustion chamber crossover tubes.

  • 12. 
    What is the most common type of fuel nozzle system?
    • A. 

      Pressure-atomizing.

    • B. 

      Fuel-blasting.

    • C. 

      Fuel ejector.

    • D. 

      Fuel tube.

  • 13. 
    Swirl-type fuel nozzles usually are used to provide what type of flame speed?
    • A. 

      Low.

    • B. 

      High.

    • C. 

      Medium.

    • D. 

      Medium-high.

  • 14. 
    Three types of turbine and vane assemblies used in jet engines are impulse,reaction,and
    • A. 

      Fir tree.

    • B. 

      Shrouded.

    • C. 

      Unshrouded.

    • D. 

      Reaction-impulse.

  • 15. 
    What is placed in front of the rotating blades in an engine turbine section?
    • A. 

      Rotating vanes.

    • B. 

      Inlet guide vanes.

    • C. 

      Turbine rotating nozzles.

    • D. 

      Turbine nozzle vane assembly.

  • 16. 
    Why is the " fir tree" method of attaching turbine blades (buckets) to the turbine rotor disc preferred?
    • A. 

      There is a significant temperature differential between the turbine rotor disc and the blades.

    • B. 

      This method aids in preventing horizontal movement of the blades.

    • C. 

      This method aids in preventing axial movement of the bucket.

    • D. 

      There is more blade tip shake during engine operation.

  • 17. 
    The exhaust duct connects the turbine outlet and the
    • A. 

      Fan duct.

    • B. 

      Jet nozzle.

    • C. 

      Fuel nozzle.

    • D. 

      Bifurcated duct.

  • 18. 
    The purpose of the exhaust duct is to
    • A. 

      Swirl exhaust gas-flow.

    • B. 

      Equalize exhaust gas -flow.

    • C. 

      Straighten exhaust gas-flow.

    • D. 

      Modulate exhaust gas-flow.

  • 19. 
    The purpose of an augmentor (afterburner) in a jet engine is to
    • A. 

      Increase engine rpm.

    • B. 

      Reduce pressure drop.

    • C. 

      Augment basic engine thrust.

    • D. 

      Increase EGT.

  • 20. 
    How many different types of loads can be imposed on a jet engine bearing?
    • A. 

      Two.

    • B. 

      Three.

    • C. 

      Four.

    • D. 

      Five.

  • 21. 
    When you handle jet engine bearings,you must change cotton gloves frequently becasue they
    • A. 

      Wear faster.

    • B. 

      Attract dirt.

    • C. 

      Cause oxidation.

    • D. 

      Get soaked with sweat.

  • 22. 
    Before inspecting new jet engine bearings,you should
    • A. 

      Sperate the halves.

    • B. 

      Apply a preservative.

    • C. 

      Perform a spin check.

    • D. 

      Remove the preservative coating.

  • 23. 
    The bearing removal tools that are most commonly used include
    • A. 

      Drift pipes and hammers.

    • B. 

      Bearing pullers and hammers.

    • C. 

      Drift pipes and arbor presses.

    • D. 

      Arbor presses and bearing pullers.

  • 24. 
    Which type of defect appears on bearings as a result of bearing parts striking together?
    • A. 

      Nicks.

    • B. 

      Galling.

    • C. 

      Grooves.

    • D. 

      Scratches

  • 25. 
    Which type of defect appears on bearings as a result of small particles of foreign material becoming lodged between the rollers?
    • A. 

      Pits.

    • B. 

      Bands.

    • C. 

      Grooves.

    • D. 

      Brinelling.

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