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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 difference of supersaturated temperature and saturation temperature at that pressure is called

    2. A.

    degree of supersaturation
    B.

    degree of superheat
    C.

    degree of undercooling
    D.

    none of these

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  2. The maximum efficiency of a reaction turbine is

    3. A.

    \(\frac {2 sin^2 \alpha } { 1 + sin^2 \alpha}\)
    B.

    \(\frac {2 cos^2 \alpha } { 1 + cos^2 \alpha}\)
    C.

    \(\frac { 1 + sin^2 \alpha} {2 sin^2 \alpha }\)
    D.

    \(\frac { 1 + cos^2 \alpha}{2 cos^2 \alpha } \)

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  3. The ratio of the useful heat drop to the isentropic heat drop is called

    4. A.

    condenser efficiency
    B.

    nozzle efficiency
    C.

    boiler efficiency
    D.

    vacuum efficiency

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  4. The efficiency of steam turbines may be improved by

    5. A.

    reheating of steam
    B.

    regenerative feed heating
    C.

    binary vapour plant
    D.

    any one of these

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  5. In a reaction turbine, when steam flows through the fixed blades,

    6. A.

    pressure increases while velocity decreases
    B.

    pressure decreases while velocity increases
    C.

    pressure and velocity both decreases
    D.

    pressure and velocity both increases

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