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Home ‣ Mechanical Engineering ‣ Compressors, Gas Dynamics and Gas Turbines Comments
  • Question

  • A gas turbine used in air-craft should have low weight and small frontal area.


  • Options
  • A. Correct
  • B. Incorrect

  • Correct Answer
  • Correct 

    • Compressors, Gas Dynamics and Gas Turbines problems

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    • 1. A receiver in compressor installations is used to damp pressure waves in compressor discharge.

    • Options
    • A. Yes
    • B. No
      • Discuss
    • 2. In a compressor, work is done on the piston during suction of air and work is done by the piston during compression as well as delivery of air.

    • Options
    • A. Agree
    • B. Disagree
      • Discuss
    • 3. Maximum work is saved in a two stage reciprocating air compressor with incomplete intercooling.

    • Options
    • A. Agree
    • B. Disagree
      • Discuss
    • 4. The air is delivered __________ in one revolution in case of a three-lobbed rotor.

    • Options
    • A. two times
    • B. three times
    • C. four times
    • D. six times
      • Discuss
    • 5. If p1 is the pressure of air entering the L.P, cylinder and p3 is the pressure of air leaving the H.P. cylinder, then the ratio of cylinder diameters for a single acting, two stage reciprocating compressor with complete intercooling is given by

    • Options
    • A. D1/D2 = (p1p3)1/2
    • B. D1/D2 = (p1/p3)1/4
    • C. D1/D2 = (p1p3)1/4
    • D. D1/D2 = (p3/p1)1/4
      • Discuss
    • 6. A jet engine has

    • Options
    • A. no propeller
    • B. propeller in front
    • C. propeller at back
    • D. propeller on the top
      • Discuss
    • 7. In a compressed air system, the temperature of air discharged from the air motor is __________ than the initial compressor intake temperature.

    • Options
    • A. more
    • B. less
      • Discuss
    • 8. The compressor efficiency is defined as the ratio of volume of free air delivery per stroke to the swept volume of the piston.

    • Options
    • A. Correct
    • B. Incorrect
      • Discuss
    • 9. Euler's equation can be used for

    • Options
    • A. radial flow compressors
    • B. axial flow compressors
    • C. pumps
    • D. all of these
      • Discuss
    • 10. The temperature of air at the beginning of the compression stroke is __________ the atmospheric temperature.

    • Options
    • A. equal to
    • B. less than
    • C. more than
      • Discuss

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