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Mechanical Engineering :: Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines - section-1
  1. As the turbine inlet temperature increases, the thermal efficiency of gas turbine for the optimum pressure ratio

    2. A.

     Increases
    B.

     Decreases
    C.

     Remain same
    D.

     First increases and then decreases

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  2. If infinite number of heaters be used in a gas turbine, then expansion process in turbine approaches

    3. A.

     Isothermal
    B.

     Isentropic
    C.

     Adiabatic
    D.

     Isochoric

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  3. Inter-cooling in gas turbine results in

    4. A.

     Increase in net output but decrease in thermal efficiency
    B.

     Increase in thermal efficiency but decrease in net output
    C.

     Increase in both thermal efficiency and net output
    D.

     Decrease in both thermal efficiency and net output

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  4. Reheating in gas turbine results in

    5. A.

     Increase of work ratio
    B.

     Decrease of thermal efficiency
    C.

     Decrease of work ratio
    D.

     Both (A) and (B) above

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  5. Reheating in multistage expansion gas turbine results in

    6. A.

     High thermal efficiency
    B.

     Reduction in compressor work
    C.

     Decrease of heat loss in exhaust
    D.

     Maximum work output

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  6. In turbo fan engine, the jet velocity as compared to turbojet engine is

    7. A.

     Less
    B.

     More
    C.

     Same
    D.

     May be less or more depending upon speed

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  7. Which is false statement about air receivers?

    8. A.

     These are used to dampen pulsations
    B.

     These act as reservoir to take care of sudden demands
    C.

     These increase compressor efficiency
    D.

     These knock out some oil and moisture

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  8. For speed above 3000 km/hour, it is more advantageous to use

    9. A.

     Turbojet engine
    B.

     Ramjet engine
    C.

     Propellers
    D.

     Rockets

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  9. When air is to be compressed at a high pressure, then it is advantageous to use

    10. A.

     Single stage compression
    B.

     Multistage compression without intercooling
    C.

     Multistage compression with intercooling
    D.

     None of these

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  10. Mining industry usually employs following motive power

    11. A.

     A.C. electric motor
    B.

     Compressed air
    C.

     Petrol engine
    D.

     Diesel engine

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