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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. Which of the following is a water tube boiler?

    2. A.

     Lancashire boiler
    B.

     Babcock and Wilcox boiler
    C.

     Locomotive boiler
    D.

     Cochran boiler

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  2. Which of the following is a water tube boiler?

    3. A.

     Locomotive boiler
    B.

     Cochran boiler
    C.

     Cornish boiler
    D.

     Babcock and Wilcox boiler

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  3. In water tube boilers

    4. A.

     Water passes through the tubes which are surrounded by flames and hot gases
    B.

     The flames and hot gases pass through the tubes which are surrounded by water
    C.

     Forced circulation takes place
    D.

     None of these

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  4. A packaged boiler is one in which various parts like firing equipment, fans, feed pumps and automatic controls are

    5. A.

     Supplied by same manufacturer loose and assembled at site
    B.

     Supplied mounted on a single base
    C.

     Purchased from several parties and packed together at site
    D.

     Packaged boiler does not exist

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  5. The biggest size of thermal power unit operating in India is

    6. A.

     30 MW
    B.

     60 MW
    C.

     100 MW
    D.

     500 MW

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  6. The critical pressure ratio for gases is

    7. A.

     0.528
    B.

     0.546
    C.

     0.577
    D.

     0.582

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  7. By compounding the expansion of steam in two or more cylinders, the ratio of expansion

    8. A.

     Does not change
    B.

     Increases
    C.

     Decreases
    D.

     None of these

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  8. When the total heat of steam is h kJ/kg and the sensible heat of feed water is hf1 kJ/kg, then the factor of evaporation is given by

    9. A.

     (h - hf1)/2257
    B.

     (h + hf1)/2257
    C.

     (h × hf1)/2257
    D.

     None of these

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  9. The effect of super-saturation is that the

    10. A.

     Mass of the steam discharged increases
    B.

     Entropy and specific volume of the steam increases
    C.

     Exit velocity of steam reduces
    D.

     All of these

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  10. The steam temperature with increase in load in case of a boiler fitted with radiation superheater

    11. A.

     Increases
    B.

     Decreases
    C.

     Remain unaffected
    D.

     First increases and then decreases

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