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Mechanical Engineering :: Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines - section-1
  1. The inlet pressure is always ________ the discharge pressure.

    2. A.

     Equal to
    B.

     Less than
    C.

     More than
    D.

     None of these

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  2. The compressor performance at higher altitude compared to sea level will be

    3. A.

     Same
    B.

     Higher
    C.

     Lower
    D.

     Dependent on other factors

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  3. Separators are generally used in air compressor installations

    4. A.

     Before the inter-cooler
    B.

     After the inter-cooler
    C.

     Between the after-cooler and receiver
    D.

     Before first stage suction

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  4. A 3 m³/min compressor means that it

    5. A.

     Compresses 3 m³/min of standard air
    B.

     Compresses 3 m³/ min of free air
    C.

     Delivers 3 m³/ min of compressed air
    D.

     Delivers 3 m³/ min of compressed air at delivery pressure

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  5. Clearance volume in actual reciprocating compressors is essential

    6. A.

     To accommodate Valves in the cylinder head
    B.

     To provide cushioning effect
    C.

     To attain high volumetric efficiency
    D.

     To provide cushioning effect and also to avoid mechanical bang of piston with cylinder head

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  6. The pressure of air at the beginning of the compression stroke is ________ the atmospheric pressure.

    7. A.

     Equal to
    B.

     Less than
    C.

     More than
    D.

     None of these

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  7. A closed gas turbine in which fuel is burnt directly in the air is not possible because of

    8. A.

     Paucity of O2
    B.

     Increasing gas temperature
    C.

     High specific volume
    D.

     High friction losses

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  8. For minimum work required to compress and deliver a quantity of air by multistage compression

    9. A.

     The compression ratio in each stage should be same
    B.

     The intercooling should be perfect
    C.

     The work-done in each stage should be same
    D.

     All of the above

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  9. Pick up the wrong statement about advantages of multistage compression

    10. A.

     Better lubrication is possible advantages of multistage
    B.

     More loss of air due to leakage past the cylinder
    C.

     Mechanical balance is better
    D.

     Air can be cooled perfectly in between

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  10. Which is false statement about advantages of multistage compressor in comparison to single stage compressor?

    11. A.

     Less power requirement
    B.

     Better mechanical balance
    C.

     Less loss of air due to leakage past the cylinder
    D.

     Lower volumetric efficiency

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