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Mechanical Engineering :: Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines - section-1
  1. Only rocket engines can be propelled to space because

    2. A.

     They can generate very high thrust
    B.

     They have high propulsion efficiency
    C.

     These engines can work on several fuels
    D.

     They are not air breathing engines

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  2. Gas turbine as compared to steam turbine

    3. A.

     Requires less space for installation
    B.

     Has compressor and combustion chamber
    C.

     Has less efficiency
    D.

     All of these

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  3. Water is injected in gas turbine cycle to

    4. A.

     Control temperature
    B.

     Control output of turbine
    C.

     Control fire hazards
    D.

     Increase efficiency

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  4. Gas turbine works on

    5. A.

     Brayton or Atkinson cycle
    B.

     Carnot cycle
    C.

     Rankine cycle
    D.

     Ericsson cycle

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  5. A closed cycle gas turbine works on

    6. A.

     Carnot cycle
    B.

     Rankine cycle
    C.

     Ericsson cycle
    D.

     Joule cycle

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  6. Open cycle gas turbine works on

    7. A.

     Brayton or Atkinson cycle
    B.

     Rankine cycle
    C.

     Carnot cycle
    D.

     Ericsson cycle

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  7. A turboprop is preferred to turbojet because

    8. A.

     It has high propulsive efficiency at high speeds
    B.

     It can fly at supersonic speeds
    C.

     It can fly at high elevations
    D.

     It has high power for take off

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  8. In jet propulsion power unit, the inlet duct of diverging shape is used in order to

    9. A.

     Collect more air
    B.

     Convert kinetic energy of air into pressure energy
    C.

     Provide robust structure
    D.

     Beautify the shape

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  9. Gas turbine cycle with regenerator

    10. A.

     Increases thermal efficiency
    B.

     Allows high compression ratio
    C.

     Decreases heat loss is exhaust
    D.

     Allows operation at very high altitudes

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  10. The ratio of the net work obtained from the gas turbine plant to the turbine work is known as

    11. A.

     Compression ratio
    B.

     Work ratio
    C.

     Pressure ratio
    D.

     None of these

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