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Mechanical Engineering :: Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines - section-1
  1. The compression ratio for the compressor is always _________ unity.

    2. A.

     Equal to
    B.

     Less than
    C.

     More than
    D.

     None of these

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  2. The hottest point in a gas turbine is

    3. A.

     at the base
    B.

     at the tip
    C.

     in the center
    D.

     between ~ to i of the blade height

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  3. Temperature of gases at end of compression as compared to exhaust gases in a gas turbine is

    4. A.

     Higher
    B.

     Lower
    C.

     Equal
    D.

     Can't be compared

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  4. The maximum temperature in a gas turbine is

    5. A.

     200°C
    B.

     500°C
    C.

     700°C
    D.

     1000°C

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  5. In a jet propulsion

    6. A.

     The propulsive matter is ejected from within the propelled body
    B.

     The propulsive matter is caused to flow around the propelled body
    C.

     Its functioning does not depend upon presence of air
    D.

     None of the above

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  6. The fuel consumption in gas turbines is accounted for by

    7. A.

     Lower heating value
    B.

     Higher heating value
    C.

     Heating value
    D.

     Higher calorific value

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  7. The indicated work per unit mass of air delivered is

    8. A.

     Directly proportional to clearance volume
    B.

     Greatly affected by clearance volume
    C.

     Not affected by clearance volume
    D.

     Inversely proportional to clearance volume

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  8. Which of the following plants is smallest and lightest for generating a given amount of power?

    9. A.

     Gas turbine plant
    B.

     Petrol engine
    C.

     Diesel engine
    D.

     Solar plant

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  9. In jet engines, for the efficient production of large power, fuel is burnt in an atmosphere of

    10. A.

     Vacuum
    B.

     Atmospheric air
    C.

     Compressed air
    D.

     Oxygen alone

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  10. Gas turbine blades are given a rake

    11. A.

     Equal to zero
    B.

     In the direction of motion of blades
    C.

     Opposite to the direction of motion of blades
    D.

     Depending on the velocity

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