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

  • In a single stage, single acting reciprocating air compressor without clearance volume, the workdone is maximum during


  • Options
  • A. isothermal compression
  • B. isentropic compression
  • C. polytropic compression
  • D. none of these

  • Correct Answer
  • isentropic compression 

    • Compressors, Gas Dynamics and Gas Turbines problems

    Search Results

    • 1. In a high pressure compressor, the delivery pressure is

    • Options
    • A. 1 to 5 bar
    • B. 5 to 8 bar
    • C. 8 to 10 bar
    • D. 10 to 15 bar
      • Discuss
    • 2. If the clearance ratio for a reciprocating air compressor is 'K', then its volumetric efficiency is given by

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 3. A turbo-prop is preferred to turbo-jet because

    • Options
    • A. it has high propulsive efficiency at high speeds
    • B. it can fly at super sonic speeds
    • C. it can fly at high elevations
    • D. it has high power for take off
      • Discuss
    • 4. For minimum work required to compress and deliver a quantity of air by multi-stage compression,

    • Options
    • A. the compression ratio in each stage should be same
    • B. the intercooling should be perfect
    • C. the workdone in each stage should be same
    • D. all of the above
      • Discuss
    • 5. If the flow of air through the compressor is parallel to its axis, then the compressor is

    • Options
    • A. reciprocating compressor
    • B. centrifugal compressor
    • C. axial flow compressor
    • D. turbo-compressor
      • Discuss
    • 6. The volume of air delivered in a medium capacity air compressor per unit time is

    • Options
    • A. 0.1 to 1.2 m3/s
    • B. 0.15 to 5 m3/s
    • C. above 5 m3/s
    • D. none of these
      • Discuss
    • 7. A simple turbo-jet engine is basically a gas turbine engine equipped with a propulsive nozzle and diffuser.

    • Options
    • A. Agree
    • B. Disagree
      • Discuss
    • 8. The propulsive power of the rocket is (where v1 = Jet velocity, and v2 = Air-craft velocity)

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 9. In n1 and n2 are the indices of compression for the first and second stage of compression, then the ratio of workdone on the first and second stages (W1/W2) with perfect intercoooing is given by

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 10. A compressor at high altitudes will require __________ power.

    • Options
    • A. same
    • B. less
    • C. more
      • Discuss

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