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

  • In a jet engine, the air-fuel ratio is


  • Options
  • A. 30:1
  • B. 40:1
  • C. 50:1
  • D. 60:1

  • Correct Answer
  • 60:1 

    • Compressors, Gas Dynamics and Gas Turbines problems

    Search Results

    • 1. The velocity of air entering in a rocket is __________ as compared to an aircraft.

    • Options
    • A. zero
    • B. less
    • C. more
    • D. same
      • Discuss
    • 2. A regenerator in a gas turbine improves thermal efficiency.

    • Options
    • A. Correct
    • B. Incorrect
      • Discuss
    • 3. The free air delivery is the volume of air that can be delivered by a compressor freely.

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. 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
    • 5. 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
    • 6. The workdone on a compressor will be minimum if air is taken from

    • Options
    • A. the atmosphere
    • B. a source at 0° C
    • C. a source of low temperature air
    • D. a source of high temperature air
      • Discuss
    • 7. For perfect intercooling in a two stage compressor,

    • Options
    • A.
    • B.
    • C. p1 = p3
    • D. p1 = p2 p3
      • Discuss
    • 8. The efficiency of the vane blower is (where W1 = Workdone due to compression, and W2 = Workdone due to back flow)

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 9. In a two stage reciprocating compressor with intercooler, the amount of work saved with incomplete intercooling is __________ that in case of complete intercooling.

    • Options
    • A. less than
    • B. more than
      • Discuss
    • 10. Which one of the following is the effect of blade shape on performance of a centrifugal compressor?

    • Options
    • A. Backward curved blades has poor efficiency
    • B. Backward curved blades lead to stable performance
    • C. Forward curved blades has higher efficiency
    • D. Forward curved blades produce lower pressure ratio
      • Discuss

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