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

  • A compressor at high altitudes will require __________ power.


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

  • Correct Answer
  • less 

    • Compressors, Gas Dynamics and Gas Turbines problems

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    • 1. 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
    • 2. The propulsive power of the rocket is (where v1 = Jet velocity, and v2 = Air-craft velocity)

    • Options
    • A.
    • B.
    • C.
    • D.
      • 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 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
    • 5. 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
    • 6. The operation of the reciprocating air motor is similar to reciprocating air compressor.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. 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
    • 8. 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
    • 9. In axial flow compressors, the flow of air is parallel to the axis of compressor.

    • Options
    • A. Correct
    • B. Incorrect
      • Discuss
    • 10. When the outlet angle from the rotor of a centrifugal compressor is more than 90°, then the blades are said to be

    • Options
    • A. forward curved
    • B. backward curved
    • C. radial
    • D. none of these
      • Discuss

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