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

  • In air compressors, free air delivery means 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

  • Correct Answer
  • actual volume of the air delivered by the compressor when reduced to normal temperature and pressure conditions 

    • Compressors, Gas Dynamics and Gas Turbines problems

    Search Results

    • 1. The overall thermal efficiency of an ideal gas turbine plant is (where r = Pressure ratio)

    • Options
    • A. r? - 1
    • B. 1 - r? - 1
    • C.
    • D.
      • Discuss
    • 2. A compressor must be driven by some prime mover.

    • Options
    • A. Agree
    • B. Disagree
      • Discuss
    • 3. The gas in cooling chamber of a closed cycle gas turbine is cooled at

    • Options
    • A. constant volume
    • B. constant temperature
    • C. constant pressure
    • D. none of these
      • Discuss
    • 4. The volumetric efficiency of the compressor is defined as the ratio of volume of free air delivery per stroke to the swept volume of the piston.

    • Options
    • A. Yes
    • B. No
      • Discuss
    • 5. In a single stage, single acting reciprocating air compressor, without clearance volume, the workdone is minimum during

    • Options
    • A. isothermal compression
    • B. isentropic compression
    • C. polytropic compression
    • D. none of these
      • Discuss
    • 6. Volumetric efficiency of a compressor decreases with __________ in compression ratio.

    • Options
    • A. decrease
    • B. increase
      • Discuss
    • 7. Which of the following statement is correct?

    • Options
    • A. The reciprocating compressors are best suited for high pressure and low volume capacity
    • B. The effect of clearance volume on power consumption is negligible for the same volume of discharge
    • C. both (a) and (b)
    • D. none of these
      • Discuss
    • 8. 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
    • 9. 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
    • 10. 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

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