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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. In locomotives, the draught is produced by

    2. A.

     Chimney
    B.

     Induced draft fan
    C.

     Both combined (A) and (B)
    D.

     Steam jet draught

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  2. In designing air preheaters, the important design consideration is that

    3. A.

     Approach temperature should be as low as possible
    B.

     Handling and maintenance should be easier
    C.

     Heat transfer area should be optimum
    D.

     Stack gases should not be cooled to the dew point

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  3. Which of the following are boiler accessories?

    4. A.

     Economizer
    B.

     Superheater
    C.

     Both (A) and (B)
    D.

     None of these

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  4. The selection of type and size of a steam boiler depends upon

    5. A.

     The power required and working pressure
    B.

     The geographical position of the power house
    C.

     The fuel and water available
    D.

     All of the above

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  5. An economiser is installed in a boiler primarily to

    6. A.

     Superheat the steam
    B.

     Reduce fuel consumption
    C.

     Increase steam pressure
    D.

     All of these

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  6. A fusible plug is fitted in small boilers in order to

    7. A.

     Avoid excessive build up of pressure
    B.

     Avoid explosion
    C.

     Extinguish fire if water level in the boiler falls below alarming limit
    D.

     Control steam dome

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  7. Presence of moisture in fuel oil would

    8. A.

     Keep the burner tips cool
    B.

     Aid in proper combustion
    C.

     Because sputtering, possibly extinguishing flame
    D.

     Clean the nozzles

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  8. Which of the following varieties of coals is mostly used in steam boilers?

    9. A.

     Non-coking bituminous coal
    B.

     Brown coal
    C.

     Peat
    D.

     None of the above

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  9. Steam turbines are used for

    10. A.

     Large marine propulsion
    B.

     Electric power generation
    C.

     Direct drive of fans, compressors, pumps
    D.

     All of these

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  10. For the same length of stroke and speed of crankshaft, the piston speed for a double acting steam engine is _________ the piston speed of single acting steam engine.

    11. A.

     Equal to
    B.

     Twice
    C.

     Three times
    D.

     Four times

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