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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 critical pressure ratio (p2/p1) is given by

    2. A.

    \(\frac { p_2 } { p_1 } = [\frac{2}{n-1}]^{n/n+1}\)
    B.

    \(\frac { p_2 } { p_1 } = [\frac{2}{n+1}]^{n/n-1}\)
    C.

    \(\frac { p_2 } { p_1 } = [\frac{n-1}{2}]^{n+1/n}\)
    D.

    \(\frac { p_2 } { p_1 } = [\frac{n+1}{2}]^{n-1/n}\)

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  2. Which of the following statement is correct?

    3. A.

    The expansion of steam in a nozzle follows Rankine cycle.
    B.

    The friction in the nozzle increases the dryness fraction of steam.
    C.

    The pressure of steam at throat is called critical pressure.
    D.

    all of the above

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  3. A binary vapour plant consists ofsteam turbine

    4. A.

    steam turbine
    B.

    steam condenser
    C.

    mercury boiler
    D.

    all of these

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  4. In reaction turbines, the axial thrust is due to

    5. A.

    pressure drop across the rotor
    B.

    change in axial velocity
    C.

    both (a) and (b)
    D.

    none of these

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  5. In a De-Laval nozzle expanding superheated steam from 10 bar to 0.1 bar, the pressure at the minimum cross-section (i. e. pressure at throat, p2) will be

    6. A.

    3.3 bar
    B.

    5.46 bar
    C.

    8.2 bar
    D.

    9.9 bar

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