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Mechanical Engineering :: Steam Nozzles and Turbines

Steam Nozzles and Turbines - Section 1
Steam Nozzles and Turbines - Section 2
Steam Nozzles and Turbines - Section 3
Steam Nozzles and Turbines - section-4
  1. The maximum efficiency of a reaction turbine is

    2. A.

     2 sin²α/(1 + sin²α)
    B.

     2 cos²α/(1 + cos²α)
    C.

     (1 + sin²α)/2 sin²α
    D.

     (1 + cos²α)/2 cos²α

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  2. The value of the reheat factor varies from

    3. A.

     1.02 to 1.06
    B.

     1.08 to 1.10
    C.

     1.2 to 1.6
    D.

     1.6 to 2

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  3. The shell of the Cochran boiler is made hemispherical

    4. A.

     To give maximum space and strength
    B.

     To withstand the pressure of steam inside the boiler
    C.

     Both (A) and (B)
    D.

     None of the above

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  4. The supersaturated flow of steam through a nozzle as compared to a stable flow, the available heat drop

    5. A.

     Remains the same
    B.

     Increases
    C.

     Decreases
    D.

     Is unpredictable

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  5. The overall efficiency of thermal power plant is

    6. A.

     Boiler efficiency, turbine efficiency, generator efficiency
    B.

     All the three above plus gas cycle efficiency
    C.

     Carnot cycle efficiency
    D.

     Regenerative cycle efficiency

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  6. Mechanical equivalent of heat for 1 kcal or Joule's equivalent is equal to

    7. A.

     421 kg.m
    B.

     421 kg.m
    C.

     539 kg.m
    D.

     102 kg.m

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  7. The critical pressure ratio for initially wet steam is

    8. A.

     0.546
    B.

     0.577
    C.

     0.582
    D.

     0.601

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  8. The purpose of governing in steam turbines is to

    9. A.

     Maintain the speed of the turbine
    B.

     Reduce the effective heat drop
    C.

     Reheat the steam and improve its quality
    D.

     Completely balance against end thrust

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  9. An air preheater

    10. A.

     Increases evaporative capacity of the boiler
    B.

     Increases the efficiency of the boiler
    C.

     Enables low grade fuel to be burnt
    D.

     All of the above

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  10. Besides mean effective pressure, the data required to determine the indicated power of an engine include

    11. A.

     Piston diameter, length of stroke and calorific value of fuel
    B.

     Piston diameter, specific fuel consumption and Calorific value of fuel
    C.

     Piston diameter, length of stroke and speed of rotation
    D.

     Specific fuel consumption, speed of rotation and torque

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