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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 discharge of steam in a convergent-divergent nozzle __________ after the throat (i.e. in the divergent portion of the nozzle)

    2. A.

    remains constant
    B.

    decreases
    C.

    increases

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  2. The rate of discharge through the nozzle __________ when the exit pressure is gradually reduced.

    3. A.

    remains same
    B.

    decreases
    C.

    increases

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  3. The velocity of steam leaving the nozzle (V) is given by (where K = Nozzle coefficient or nozzle efficiency, and hd = Enthalpy or heat drop during expansion of steam in a nozzle)

    4. A.

    V = 44.72 hd \(\sqrt{K}\)
    B.

    C.

    D.

    V = 44.72 K hd

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  4. In a nozzle, whole frictional loss is assumed to occur between

    5. A.

    inlet and thoroat
    B.

    inlet and outlet
    C.

    throat and exit
    D.

    all of these

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  5. The critical pressure ratio for initially wet steam is

    6. A.

    0.546
    B.

    0.577
    C.

    0.582
    D.

    0.601

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