2A551 CDCs Volume 3 Of 3 Ure Questions Only

100 Questions | Total Attempts: 1053

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CDCs Quizzes & Trivia

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

      Increase its energy

    • B. 

      Decrease its energy

    • C. 

      Decrease its volume

    • D. 

      Increase its efficiency

  • 2. 
    In a jet engine, the velocity of the air is decreased by the
    • A. 

      Diffuser

    • B. 

      Afterburner

    • C. 

      Compressor

    • D. 

      Turbine blades

  • 3. 
    An aircraft taxiing at a constant 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

  • 4. 
    Foot-pounds and inch-pounds are units of measure for
    • A. 

      Work

    • B. 

      Power

    • C. 

      Inertia

    • D. 

      Friction

  • 5. 
    The resistance of an object to change its motion is a property of matter called
    • A. 

      Energy

    • B. 

      Inertia

    • C. 

      Friction

    • D. 

      Potential

  • 6. 
    The ability to do work is the definition 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 flowing through a jet engine is
    • A. 

      Low velocity at all times

    • B. 

      Less velocity exiting than entering

    • C. 

      Equal velocity 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-supercharger

    • B. 

      The nozzles within the engine are called jets

    • C. 

      It uses a turbine-type compressor to maintain power

    • D. 

      It uses a 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 great velocities

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

      Axial-flow because of size

    • B. 

      Centrifugal because of 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-ratio zone

    • C. 

      Compressor stall zone

    • D. 

      Operating temperature zone

  • 19. 
    The most chemically correct ratio 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 diffuser 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, 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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