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Mechanical Engineering :: Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines - section-1
  1. Rotary compressors are suitable for

    2. A.

     Large discharge at high pressure
    B.

     Low discharge at high pressure
    C.

     Large discharge at low pressure
    D.

     Low discharge at low pressure

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  2. An air compressor may be controlled by

    3. A.

     Throttle control
    B.

     Clearance control
    C.

     Blow off control
    D.

     Any one of the above

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  3. The degree of reaction of an axial flow turbine is the ratio of isentropic temperature drop in a blade row to the

    4. A.

     Adiabatic temperature drop in the stage
    B.

     Total temperature drop
    C.

     Total temperature drop in the stage
    D.

     Total adiabatic temperature drop

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  4. The net work input required for compressor with increase in clearance volume

    5. A.

     Increases
    B.

     Decreases
    C.

     Remains same
    D.

     Increases/decreases depending on compressor capacity

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  5. Volumetric efficiency of a compressor without clearance volume

    6. A.

     Increases with increase in compression ratio
    B.

     Decreases with increase in compression ratio
    C.

     Is not dependent upon compression ratio
    D.

     May increase/decrease depending on compressor capacity

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  6. Volumetric efficiency of a compressor with clearance volume

    7. A.

     Increases with increase in compression ratio
    B.

     Decreases with increase in compression ratio
    C.

     In not dependent upon compression ratio
    D.

     May increase/decrease depending on compressor capacity

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  7. Compression efficiency is compared against

    8. A.

     Ideal compression
    B.

     Adiabatic compression
    C.

     Isentropic compression
    D.

     Isothermal compression

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  8. Phenomenon of choking in compressor means

    9. A.

     No flow of air
    B.

     Fixed mass flow rate regardless of pressure ratio
    C.

     Reducing mass flow rate with increase in pressure ratio
    D.

     Increased inclination of chord with air steam

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  9. Reheating in a multistage expansion gas turbine ________ compressor work.

    10. A.

     Has no effect on
    B.

     Decreases
    C.

     Increases
    D.

     None of these

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  10. The work ratio of simple gas turbine cycle depends on

    11. A.

     Pressure ratio
    B.

     Maximum cycle temperature
    C.

     Minimum cycle temperature
    D.

     All of the above

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