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

  • The volumetric efficiency of a compressor


  • Options
  • A. increases with decrease in compression ratio
  • B. decreases with decrease in compression ratio
  • C. increases with increase in compression ratio
  • D. decreases with increase in compression ratio

  • Correct Answer
  • decreases with increase in compression ratio 

    • Compressors, Gas Dynamics and Gas Turbines problems

    Search Results

    • 1. Reheating in a multi-stage expansion gas turbine __________ compressor work.

    • Options
    • A. has no effect on
    • B. decreases
    • C. increases
      • Discuss
    • 2. In a jet propulsion unit, the products of combustion after passing through the gas turbine are discharged into

    • Options
    • A. atmosphere
    • B. vacuum
    • C. discharge nozzle
    • D. back to the compressor
      • Discuss
    • 3. In an axial flow compressor, the ratio of pressure in theTOtor blades to the pressure rise in the compressor in one stage is known as

    • Options
    • A. work factor
    • B. slip factor
    • C. degree of reaction
    • D. pressure coefficient
      • Discuss
    • 4. Which of the following bladings will give maximum pressure rise in a centrifugal compressor, assuming the same overall dimensions, blade inlet angle and rotational speeds?

    • Options
    • A. Forward curved blades
    • B. Backward curved blades
    • C. Radial blades
    • D. all of these
      • Discuss
    • 5. The ratio of the discharge pressure to the inlet pressure of air is called

    • Options
    • A. compression ratio
    • B. expansion ratio
    • C. compressor efficiency
    • D. volumetric efficiency
      • Discuss
    • 6. The volume of air sucked by the compressor during its suction stroke is called

    • Options
    • A. free air delivery
    • B. compressor capacity
    • C. swept volume
    • D. none of these
      • Discuss
    • 7. A compressor mostly used for supercharging of I.C. engines is

    • Options
    • A. radial flow compressor
    • B. axial flow compressor
    • C. roots blower
    • D. reciprocating compressor
      • Discuss
    • 8. The free air delivery is the volume of air that can be delivered by a compressor freely.

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. A regenerator in a gas turbine improves thermal efficiency.

    • Options
    • A. Correct
    • B. Incorrect
      • Discuss
    • 10. The velocity of air entering in a rocket is __________ as compared to an aircraft.

    • Options
    • A. zero
    • B. less
    • C. more
    • D. same
      • Discuss

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