2A551 Practice Test Volume 3

48 Questions | Total Attempts: 194

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Practice Test Quizzes & Trivia

Questions and Answers
  • 1. 
    It is important to raise the air temperature in a jet engine to
    • A. 

      Increase the energy.

    • B. 

      Decrease the energy.

    • C. 

      Decrease the volume.

    • D. 

      Increase its efficiency.

  • 2. 
    An aircraft taxiing at a constant rate of speed is an example of
    • A. 

      Bernoulli's Law

    • B. 

      Newton's First Law of Motion

    • C. 

      Newton's Second Law of Motion

    • D. 

      Newton's Third Law of Motion

  • 3. 
    Foot-pounds and inch-pounds are units of measure for
    • A. 

      Work.

    • B. 

      Power.

    • C. 

      Inertia.

    • D. 

      Friction.

  • 4. 
    The resistance of an object to change its motion is a property of matter called
    • A. 

      Energy.

    • B. 

      Inertia.

    • C. 

      Friction.

    • D. 

      Potential.

  • 5. 
    In a jet engine, the velocity of the air is decreased by the
    • A. 

      Diffuser.

    • B. 

      Afterburner.

    • C. 

      Compressor.

    • D. 

      Turbine blades.

  • 6. 
    The ability to do work is the defination of
    • A. 

      Energy.

    • B. 

      Inertia.

    • C. 

      Friction.

    • D. 

      Velocity.

  • 7. 
    In a jet engine, fuel is metered for combustion by the
    • A. 

      Pressurizing and dump (P&D) valve.

    • B. 

      Fuel nozzles.

    • C. 

      Fuel control.

    • D. 

      Fuel pump.

  • 8. 
    The average percentage of a jet engine's energy required to maintain engine operation is
    • A. 

      50.

    • B. 

      60.

    • C. 

      70.

    • D. 

      80.

  • 9. 
    What effect does the divergent design of a jet engine diffuser have on pressure?
    • A. 

      Increases pressure.

    • B. 

      Decreases pressure.

    • C. 

      Results in pressure fluctuations.

    • D. 

      Has minimum effect on pressure.

  • 10. 
    The required velocity for air and gases flwoing through a jet engine is
    • A. 

      Low velocity at all times.

    • B. 

      Less velocity exiting that entering.

    • C. 

      Equal velocity for entering and exiting.

    • D. 

      Greater velocity exiting than entering.

  • 11. 
    The velocity of the stream of air that flows through a jet engine reaches its highest point at the
    • A. 

      Turbine stator (nozzle diaphragm)

    • B. 

      Turbine exhaust cone.

    • C. 

      Combustion section

    • D. 

      Ejector nozzle.

  • 12. 
    When two or more turbine wheels are used in a jet engine, what is placed directly in front of each turbine wheel?
    • A. 

      Diffuser.

    • B. 

      Jet Nozzle.

    • C. 

      Combustion Liner.

    • D. 

      Nozzle diaphragm.

  • 13. 
    A jet engine derives its name from the fact that
    • A. 

      It is in effect a turbo-charger.

    • B. 

      The nozzles within the engine are called jets.

    • C. 

      It uses a turbine type compressor to maintain power.

    • D. 

      It uses exhaust-gas-driven turbine wheel to drive its compressor.

  • 14. 
    The three major sections of all jet engines are compressor, combustion, and
    • A. 

      Turbo.

    • B. 

      Turbine.

    • C. 

      Exhaust.

    • D. 

      Diffuser.

  • 15. 
    The condition that rapidly reduces the efficiency of a centrifugal jet engine compressor would be
    • A. 

      Resultant velocity.

    • B. 

      Tangential velocity.

    • C. 

      Pressure pulsations.

    • D. 

      Air mass leaving the impeller at greater velocities.

  • 16. 
    The type of engine that is cheaper to manufacture is the
    • A. 

      Axial flow because of its size.

    • B. 

      Centrifugal because of its size.

    • C. 

      Axial flow because of fewer parts.

    • D. 

      Centrifugal because of fewer parts.

  • 17. 
    The percentage of combustion efficiency of a gas turbine is usually between
    • A. 

      60 and 70.

    • B. 

      65 and 75.

    • C. 

      75 and 95.

    • D. 

      95 and 100.

  • 18. 
    The term "combustion range" is defined as a jet engine's
    • A. 

      Steady state zone.

    • B. 

      Pressure ration zone.

    • C. 

      Compressor stall zone.

    • D. 

      Operating temperature zone.

  • 19. 
    The most chemically correct ration for burning fuel in a combustion chamber is
    • A. 

      10:1

    • B. 

      10:4

    • C. 

      15:1

    • D. 

      15:4

  • 20. 
    The inner and outer surfaces of an annular-type combustion chamber are formed by
    • A. 

      Interlocking stainless steel bands.

    • B. 

      The inner and outer difuser case.

    • C. 

      A forged steel casing.

    • D. 

      Solid sheet metal.

  • 21. 
    The most common type of fuel nozzle system is the
    • A. 

      Pressure-atomizing.

    • B. 

      Fuel-blasting.

    • C. 

      Fuel ejector.

    • D. 

      Fuel tube.

  • 22. 
    Swirl type fuel nozzles are usually used to provide what type of flame speed?
    • A. 

      Low

    • B. 

      High

    • C. 

      Medium

    • D. 

      Medium-High

  • 23. 
    The three design types of turbines used in jet engines are
    • A. 

      Shrouded, unshrouded, and fir tree.

    • B. 

      Shrouded, unshrouded, and corrugated.

    • C. 

      Impulse, reaction, and reaction-impulse.

    • D. 

      Impeller, impulse, and reaction-impulse.

  • 24. 
    On some jet engines, the turbine bucket is secured in place by
    • A. 

      Screws

    • B. 

      Cables

    • C. 

      Lockwire

    • D. 

      Lock strips

  • 25. 
    The purpose of the exhaust duct is to
    • A. 

      Swirl exhaust gas flow

    • B. 

      Equalize exhaust gas flow

    • C. 

      Modulate exhaust gas flow

    • D. 

      Straighten exhaust gas flow

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