Volume 2 2A651 CDC ( Q 16-44 )

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    Stationary vanes positioned between rotor discs in a compressor are used to

    • Direct air and increase pressure.
    • Direct hot gases rearward.
    • Increase backup pressure.
    • Prolong compressor life.
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  • 2. 

    What is the most common type of fuel nozzle system?

    • Pressure-atomizing.

    • Fuel-blasting.

    • Fuel ejector.

    • Fuel tube.

    Correct Answer
    A. Pressure-atomizing.
  • 3. 

    The recommended method of heating inner races of bearings before installing them is

    • Hot-oil bath.

    • Portable heater.

    • Bearing furnace.

    • Hydraulic oil bath.

    Correct Answer
    A. Hot-oil bath.
  • 4. 

    Three types of turbine and vane assemblies used in jet engines are impulse,reaction,and

    • Fir tree.

    • Shrouded.

    • Unshrouded.

    • Reaction-impulse.

    Correct Answer
    A. Reaction-impulse.
  • 5. 

    Fuel that accumulates after a failed start is

    • Returned to the fuel control by tubes.

    • Drained overboard by a drain system.

    • Burned on the next start attempt.

    • Allowed to evaporate.

    Correct Answer
    A. Drained overboard by a drain system.
  • 6. 

    The bearing removal tools that are most commonly used include

    • Drift pipes and hammers.

    • Bearing pullers and hammers.

    • Drift pipes and arbor presses.

    • Arbor presses and bearing pullers.

    Correct Answer
    A. Arbor presses and bearing pullers.
  • 7. 

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

    • Rotational and centrifugal.

    • Rotational and tangential.

    • Tangential and centrifugal.

    • Tangential and radial

    Correct Answer
    A. Rotational and centrifugal.
  • 8. 

    When you handle jet engine bearings,you must change cotton gloves frequently becasue they

    • Wear faster.

    • Attract dirt.

    • Cause oxidation.

    • Get soaked with sweat.

    Correct Answer
    A. Get soaked with sweat.
  • 9. 

    On an F108 engine,the radial drive shaft connects the core engine to the

    • Hydraulic actuator motor.

    • Accessory drive assembly.

    • Variable bleed valves.

    • Fan booster rotor.

    Correct Answer
    A. Accessory drive assembly.
  • 10. 

    Before inspecting new jet engine bearings,you should

    • Sperate the halves.

    • Apply a preservative.

    • Perform a spin check.

    • Remove the preservative coating.

    Correct Answer
    A. Remove the preservative coating.
  • 11. 

    The three major sections of all jet engines are compressor, combustion,and

    • Turbo.

    • Turbine.

    • Exhaust.

    • Diffuser.

    Correct Answer
    A. Turbine.
  • 12. 

    The purpose of the exhaust duct is to

    • Swirl exhaust gas-flow.

    • Equalize exhaust gas -flow.

    • Straighten exhaust gas-flow.

    • Modulate exhaust gas-flow.

    Correct Answer
    A. Straighten exhaust gas-flow.
  • 13. 

    Which component reduces the engine rotor speed to the rpm required for accessories?

    • Step motors.

    • Reduction motor.

    • Reduction geartrain.

    • Gear case drive assembly.

    Correct Answer
    A. Reduction geartrain.
  • 14. 

    The excess airflow that is not burned in the combustion section is used to

    • Cool the burner surfaces.

    • Operate pneumatic accessories

    • Decrease the mass of exhaust gases.

    • Increase air in the compressor section.

    Correct Answer
    A. Cool the burner surfaces.
  • 15. 

    Swirl-type fuel nozzles usually are used to provide what type of flame speed?

    • Low.

    • High.

    • Medium.

    • Medium-high.

    Correct Answer
    A. High.
  • 16. 

    Vane-type fuel pumps used in jet engines are similar to

    • Sliding-vane air compressors.

    • Piston pump air compressors.

    • Roots air compressors.

    • Turbo-superchargers.

    Correct Answer
    A. Sliding-vane air compressors.
  • 17. 

    Excessive bearing wear can usually be detected by

    • Pits.

    • Bands.

    • Misalignment.

    • Roughness of the metal.

    Correct Answer
    A. Roughness of the metal.
  • 18. 

    Which facet of engine design helps prevent igniter plug fouling?

    • Gold plating on the plug.

    • Split electrode on the plug.

    • Ceramic coating on the plug.

    • Directing air around the plug.

    Correct Answer
    A. Directing air around the plug.
  • 19. 

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

    • Fuel nozzle.

    • Transition liner.

    • Combustion chamber outer case.

    • Combustion chamber crossover tubes.

    Correct Answer
    A. Combustion chamber crossover tubes.
  • 20. 

    A constuctional feature of the centrifugal compressor is that the impeller

    • Has two matching lpates.

    • Has a lighweight design.

    • Is forged as a single unit.

    • Is constructed in rows of blades and stators.

    Correct Answer
    A. Is forged as a single unit.
  • 21. 

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

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

    • This method aids in preventing horizontal movement of the blades.

    • This method aids in preventing axial movement of the bucket.

    • There is more blade tip shake during engine operation.

    Correct Answer
    A. There is a significant temperature differential between the turbine rotor disc and the blades.
  • 22. 

    Which type of defect appears on bearings as a result of bearing parts striking together?

    • Nicks.

    • Galling.

    • Grooves.

    • Scratches

    Correct Answer
    A. Nicks.
  • 23. 

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

    • Pits.

    • Bands.

    • Grooves.

    • Brinelling.

    Correct Answer
    A. Grooves.
  • 24. 

    How many different types of loads can be imposed on a jet engine bearing?

    • Two.

    • Three.

    • Four.

    • Five.

    Correct Answer
    A. Three.
  • 25. 

    The forward end of the shaft on a centrifugal compressor is hollow in order to

    • Act as a vibration damper.

    • Allow cooling air to the turbine.

    • Provide a passage for lubricating oil.

    • Provide a passage for the main fuel supply.

    Correct Answer
    A. Provide a passage for the main fuel supply.
  • 26. 

    In a dual-spool compressor,rpm of the N2 compressor are determined by the

    • Starter.

    • Fuel pump.

    • Fuel control.

    • Low-pressure turbine.

    • Beer

    Correct Answer
    A. Fuel control.
  • 27. 

    What is placed in front of the rotating blades in an engine turbine section?

    • Rotating vanes.

    • Inlet guide vanes.

    • Turbine rotating nozzles.

    • Turbine nozzle vane assembly.

    Correct Answer
    A. Turbine nozzle vane assembly.
  • 28. 

    The exhaust duct connects the turbine outlet and the

    • Fan duct.

    • Jet nozzle.

    • Fuel nozzle.

    • Bifurcated duct.

    Correct Answer
    A. Fan duct.
  • 29. 

    The purpose of an augmentor (afterburner) in a jet engine is to

    • Increase engine rpm.

    • Reduce pressure drop.

    • Augment basic engine thrust.

    • Increase EGT.

    Correct Answer
    A. Increase EGT.

Quiz Review Timeline (Updated): Mar 19, 2022 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 19, 2022
    Quiz Edited by
    ProProfs Editorial Team
  • Dec 21, 2010
    Quiz Created by
    Vison
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