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Compressors, Gas Dynamics and Gas Turbines problems

  • 1. 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
    • Discuss
  • 2. 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
  • 3. A simple turbo-jet engine is basically a gas turbine engine equipped with a propulsive nozzle and diffuser.

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

  • Options
  • A.
  • B.
  • C.
  • D.
    • Discuss
  • 5. 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
  • 6. A compressor at high altitudes will require __________ power.

  • Options
  • A. same
  • B. less
  • C. more
    • Discuss
  • 7. The operation of the reciprocating air motor is similar to reciprocating air compressor.

  • Options
  • A. True
  • B. False
    • Discuss
  • 8. Separators are generally used in air compressor installations

  • Options
  • A. before the intercooler
  • B. after the intercooler
  • C. between the aftercooler and receiver
  • D. before first stage suction
    • Discuss
  • 9. The mean effective pressure of the compressor is the

  • Options
  • A. actual volume of the air delivered by the compressor when reduced to normal temperature and pressure conditions
  • B. volume of air delivered by the compressor
  • C. volume of air sucked by the compressor during its suction stroke
  • D. none of the above
    • Discuss
  • 10. In axial flow compressors, the flow of air is parallel to the axis of compressor.

  • Options
  • A. Correct
  • B. Incorrect
    • Discuss

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