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Mechanical Engineering :: Steam Boilers and Engines

  1. The ratio of the clearance volume to the swept volume is called

  2. A.

    cut-off ratio

    B.

    expansion ratip

    C.

    clearance ratio

    D.

    none of these

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  3. The air pressure at the fuel bed is reduced below that of atmosphere by means of a fan placed at or near the bottom of the chimney to produce a draught. Such a draught is called

  4. A.

    natural draught

    B.

    induced draught

    C.

    forced draught

    D.

    balanced draught

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  5. The Locomotive boiler has

  6. A.

    137 fire tubes and 44 superheated tubes

    B.

    147 fire tubes and 34 superheated tubes

    C.

    157 fire tubes and 24 superheated tubes

    D.

    167 fire tubes and 14 superheated tubes

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  7. The shell of the Cochran boiler is made hemispherical

  8. A.

    to give maximum space and strength

    B.

    to withstand the pressure of steam inside the boiler

    C.

    both (a) and (b)

    D.

    none of the above

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  9. A __________ in a boiler is used to put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit.

  10. A.

    blow off cock

    B.

    fusible plug

    C.

    stop valve

    D.

    safety valve

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