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

  • 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

  • Correct Answer
  • D1/D2 = (p3/p1)1/4 

    • Compressors, Gas Dynamics and Gas Turbines problems

    Search Results

    • 1. In a gas turbine, air is obtained from the atmosphere and compressed in an air compressor.

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. In a centrifugal compressor, the highest Mach number leading to shock wave in the fluid flow occurs at

    • Options
    • A. diffuser inlet radius
    • B. diffuser outlet radius
    • C. impeller inlet radius
    • D. impeller outlet radius
      • Discuss
    • 3. Gas turbine as compared to internal combustion engine

    • Options
    • A. can be driven at a very high speed
    • B. produces uniform torque
    • C. has more efficiency
    • D. all of these
      • Discuss
    • 4. The power actually developed by the engine cylinder of an I.C. engine is known as

    • Options
    • A. theoretical power
    • B. actual power
    • C. indicated power
    • D. none of these
      • Discuss
    • 5. The air-fuel ratio of the petrol engine is controlled by

    • Options
    • A. carburettor
    • B. injector
    • C. governor
    • D. none of these
      • Discuss
    • 6. 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
    • 7. Maximum work is saved in a two stage reciprocating air compressor with incomplete intercooling.

    • Options
    • A. Agree
    • B. Disagree
      • Discuss
    • 8. 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
    • 9. A receiver in compressor installations is used to damp pressure waves in compressor discharge.

    • Options
    • A. Yes
    • B. No
      • Discuss
    • 10. A gas turbine used in air-craft should have low weight and small frontal area.

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

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