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

  • In reciprocating air compressors, isothermal efficiency is used for all sorts of calculations.


  • Options
  • A. Correct
  • B. Incorrect

  • Correct Answer
  • Correct 

    • Compressors, Gas Dynamics and Gas Turbines problems

    Search Results

    • 1. In gas turbines, the work input with intercooling is __________ the work input with no intercooling.

    • Options
    • A. less man
    • B. more than
      • Discuss
    • 2. Air motors work on the cycle which is the reverse of the reciprocating air compressor cycle.

    • Options
    • A. Agree
    • B. Disagree
      • Discuss
    • 3. In a jet engine, the compression varies as the square of the speed.

    • Options
    • A. Correct
    • B. Incorrect
      • Discuss
    • 4. A machine used to raise the pressure of air is called

    • Options
    • A. gas turbine
    • B. I.C engine
    • C. compressor
    • D. air motor
      • Discuss
    • 5. The operation of lifts, rams and pumps make use of compressed air.

    • Options
    • A. Yes
    • B. No
      • Discuss
    • 6. The perfect intercooling, in multistage compression, means that the temperature of air at inlet to subsequent stages is equal to the initial temperature.

    • Options
    • A. Agree
    • B. Disagree
      • Discuss
    • 7. For perfect intercooling in a three stage compressor,

    • Options
    • A.
    • B.
    • C. p1p2 = p3p4
    • D. p1p3 = p2p4
      • Discuss
    • 8. In a single acting reciprocating air compressor, without clearance, the compression of air may be

    • Options
    • A. isothermal
    • B. polytropic
    • C. isentropic
    • D. any one of these
      • Discuss
    • 9. In open cycle turbo-jet engines used in military aircraft, reheating the exhaust gas from the turbine by burning, more fuel is used to increase the

    • Options
    • A. thrust and range of aircraft
    • B. efficiency of the engine
    • C. both (a) and (b)
    • D. none of these
      • Discuss
    • 10. The efficiency of roots blower __________ with the increase in pressure ratio.

    • Options
    • A. decreases
    • B. increases
    • C. does not change
      • Discuss

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