CDC Volume 2 Edit Code 2

100 Questions | Total Attempts: 48

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CDC Quizzes & Trivia

Questions and Answers
  • 1. 
    An aircraft taxiing at a steady speed can be used to demonstrate
    • A. 

      Bernoulli’s principle.

    • B. 

      Newton’s first law of motion.

    • C. 

      Newton’s second law of motion.

    • D. 

      Newton’s third law of motion.

  • 2. 
    Which law may you sum up with two words: action and reaction?
    • A. 

      Bernoulli’s principle.

    • B. 

      Newton’s first law of motion.

    • C. 

      Newton’s second law of motion.

    • D. 

      Newton’s third law of motion.

  • 3. 
    Which type of duct would decrease the velocity and increase the pressure of a gas as it passes through?
    • A. 

      Elbow.

    • B. 

      Straight.

    • C. 

      Divergent.

    • D. 

      Convergent.

  • 4. 
    The ability to do work is the definition of
    • A. 

      Energy.

    • B. 

      Inertia.

    • C. 

      Friction.

    • D. 

      Velocity.

  • 5. 
    What does fuel for an engine represent?
    • A. 

      Thrust produced.

    • B. 

      Efficiency ratio.

    • C. 

      Potential energy.

    • D. 

      Available horsepower.

  • 6. 
    The temperature of compressed air in a jet engine must be raised to
    • A. 

      Increase energy.

    • B. 

      Decrease energy.

    • C. 

      Increase volume.

    • D. 

      Decrease volume.

  • 7. 
    Which section of a jet engine introduces and burns fuel?
    • A. 

      Turbine.

    • B. 

      Diffuser.

    • C. 

      Compressor.

    • D. 

      Combustion.

  • 8. 
    Which method of producing thrust does a turboprop engine use?
    • A. 

      Using only the energy expended through the exhaust nozzle to propel the aircraft forward.

    • B. 

      Using the same working fluid for propulsive force as that used within the engine.

    • C. 

      Accelerating a large mass of air through a small velocity change.

    • D. 

      Moving a small quantity of air through a large velocity change.

  • 9. 
    Which type of horsepower is delivered to the propeller for useful work?
    • A. 

      Brake.

    • B. 

      Indicated.

    • C. 

      Frictional.

    • D. 

      Equivalent shaft.

  • 10. 
    Which type of horsepower determines the performance of the engine-propeller combination?
    • A. 

      Brake.

    • B. 

      Indicated.

    • C. 

      Frictional.

    • D. 

      Equivalent shaft.

  • 11. 
    The two fluids combined to make up common jet fuel are
    • A. 

      Gasoline and oil

    • B. 

      Kerosene and oil.

    • C. 

      Gasoline and water.

    • D. 

      Kerosene and gasoline.

  • 12. 
    Which is not a method of heat transfer?
    • A. 

      Radiation.

    • B. 

      Convection.

    • C. 

      Penetration.

    • D. 

      Conduction.

  • 13. 
    The air temperature of a jet engine gradually rises across the compressor to the diffuser outlet as a result of
    • A. 

      Compression.

    • B. 

      Fuel expansion.

    • C. 

      Turbine discharge.

    • D. 

      Ambient temperature increase.

  • 14. 
    Where is the highest point of temperature reached in an engine?
    • A. 

      Tailpipe.

    • B. 

      Exhaust cone.

    • C. 

      Turbine section.

    • D. 

      Combustion section.

  • 15. 
    Which engine component meters fuel for combustion?
    • A. 

      P&D valve.

    • B. 

      Fuel pump.

    • C. 

      Fuel control.

    • D. 

      Fuel nozzles.

  • 16. 
    What happens to the energy that is absorbed by the turbine wheel?
    • A. 

      50 percent is used for accessories.

    • B. 

      60 percent is used for accessories.

    • C. 

      The energy operates the anti-ice system.

    • D. 

      The energy is returned to the compressor.

  • 17. 
    On an average, what percent of all the energy produced by the fuel is required to maintain the engine operating cycle?
    • A. 

      50

    • B. 

      60

    • C. 

      70

    • D. 

      80

  • 18. 
    What directs the gases onto the first-stage turbine wheel blades in a jet engine?
    • A. 

      Turbine wheel blades.

    • B. 

      Combustion chamber.

    • C. 

      Turbine stator.

    • D. 

      Flameholder.

  • 19. 
    A jet engine derives its name from its design in that it uses
    • A. 

      Turbo-superchargers within the engine.

    • B. 

      A turbine-type compressor to maintain power.

    • C. 

      Nozzles which are called jet within the engine.

    • D. 

      A gas-driven turbine wheel to drive its compressor.

  • 20. 
    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.

  • 21. 
    Which condition reduces the efficiency of a centrifugal compressor?
    • A. 

      Resultant velocity.

    • B. 

      Tangential velocity.

    • C. 

      Pressure pulsations

    • D. 

      Air mass leaving the impeller at great velocities.

  • 22. 
    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.

  • 23. 
    The jet engine compressor that is cheaper to manufacture is the
    • A. 

      Axial-flow type, because of its size.

    • B. 

      Centrifugal type, because of its size.

    • C. 

      Axial-flow type, because of its fewer parts.

    • D. 

      Centrifugal type, because of its fewer parts.

  • 24. 
    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.

  • 25. 
    What is the most probable cause of a flameout of a jet engine flying at 40,000 feet with a constant engine revolutions per minute (rpm) of 50 percent?
    • A. 

      The rpm is too low.

    • B. 

      A decrease in barometric pressure.

    • C. 

      The failure of the breather pressurizing valve.

    • D. 

      Excessive ducting of air from the compressor into the combustion chamber.

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