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Mechanical Engineering :: Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines - section-1
  1. Turbofan engine employs

    2. A.

     One air stream
    B.

     Two or more air streams
    C.

     No air stream
    D.

     Solid fuel firing

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  2. Gas turbines for power generation are normally used

    3. A.

     To supply base load requirements
    B.

     To supply peak load requirements
    C.

     To enable start thermal power plant
    D.

     In emergency

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  3. The criterion of the thermodynamic efficiency for rotary compressor is

    4. A.

     Isentropic compression
    B.

     Isothermal compression
    C.

     Polytropic compression
    D.

     None of the above

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  4. Producer gas is produced by

    5. A.

     Carbonisation of coal
    B.

     Passing steam over incandescent coke
    C.

     Passing air and a large amount of steam over waste coal at about 65°C
    D.

     Partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast

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  5. Water gas is produced by

    6. A.

     Carbonisation of coal
    B.

     Passing steam over incandescent coke
    C.

     Passing air and a large amount of steam over waste coal at about 65°C
    D.

     Partial combustion of coal, eke, anthracite coal or charcoal in a mixed air steam blast

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  6. Which of the following statement is wrong?

    7. A.

     In a two stage reciprocating air compressor with complete intercooling, maximum work is saved
    B.

     The minimum work required for a two stage reciprocating air compressor is double the work required for each stage
    C.

     The ratio of the volume of free air delivery per stroke to the swept volume of the piston is called volumetric efficiency
    D.

     None of the above

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  7. Work ratio of a gas turbine may be improved by

    8. A.

     Decreasing the compression work
    B.

     Increasing the compression work
    C.

     Increasing the turbine work
    D.

     Both (A) and (C) above

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  8. The gas in cooling chamber of a closed cycle gas turbine is cooled at

    9. A.

     Constant volume
    B.

     Constant temperature
    C.

     Constant pressure
    D.

     None of these

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  9. In a turbo jet engine, subsequent to heat addition to compressed air, to get the power output, the working substance is expanded in

    10. A.

     Exit nozzle, which is a constant volume process
    B.

     Exit nozzle, which is essentially an isentropic process
    C.

     Turbine blades, which is a constant volume process
    D.

     Turbine blades, which is essentially an isentropic process

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  10. Gas turbine as compared to internal combustion engine

    11. A.

     Can be driven at a very high speed
    B.

     Produces uniform torque
    C.

     Has more efficiency
    D.

     All of these

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