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Mechanical Engineering :: Steam Nozzles and Turbines

  1. The power of a boiler may be defined as

  2. A.

     The ratio of heat actually used in producing the steam to the heat liberated in the furnace

    B.

     The amount of water evaporated or steam produced in kg per kg of fuel burnt

    C.

     The amount of water evaporated from and at 100° C into dry and saturated steam

    D.

     The evaporation of 15.653 kg of water per hour from and at 100° C


  3. The cylinder condensation or missing quantity may be reduced by

  4. A.

     The efficient steam jacketing of the cylinder walls

    B.

     Superheating the steam supplied to the engine cylinder

    C.

     Keeping the expansion ratio small in each cylinder

    D.

     All of the above


  5. The basic job of feed water treatment in boilers is to overcome the problem of

  6. A.

     Corrosion

    B.

     Scale

    C.

     Carryover

    D.

     All of the above


  7. Orsat meter is used for

  8. A.

     Gravimetric analysis of the flue gases

    B.

     Volumetric analysis of the flue gases

    C.

     Mass flow of the flue gases

    D.

     Measuring smoke density of flue gases


  9. An economiser in a boiler

  10. A.

     Increases steam pressure

    B.

     Increases steam flow

    C.

     Decreases fuel consumption

    D.

     Decreases steam pressure


  11. A device used to heat feed water by utilizing the heat in me exhaust flue gases before leaving through the chimney, is known as

  12. A.

     Economizer

    B.

     Fusible plug

    C.

     Superheater

    D.

     Stop valve


  13. Which is not the correct statement about moisture in coal?

  14. A.

     Inherent moisture and surface moisture are different things

    B.

     In some coals moisture may be present up to 40%

    C.

     Some moisture in coal helps in better burning which is not possible with completely dry coal

    D.

     It increases thermal efficiency


  15. The diameters of fire tubes and superheater tubes in locomotive boiler are

  16. A.

     47.5 mm, 130 mm

    B.

     32.5 mm, 180 mm

    C.

     65.5 mm, 210 mm

    D.

     24.5 mm, 65 mm


  17. The shell diameter and length of locomotive boiler are

  18. A.

     1.5 m, 4 m

    B.

     1.5 m, 6 m

    C.

     1 m, 4 m

    D.

     2 m, 4 m


  19. The Locomotive boiler has

  20. 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