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Mechanical Engineering :: Steam Nozzles and Turbines

  1. Alkaline pyrogallate is used in Orsat's apparatus for absorption of

  2. A.

     CO₂

    B.

     CO

    C.

     O₂

    D.

     N₂


  3. The draught produced by a steam jet issuing from a nozzle placed in the ash-pit under the fire grate of the furnace is called

  4. A.

     Induced steam jet draught

    B.

     Chimney draught

    C.

     Forced steam jet draught

    D.

     None of these


  5. The pressure velocity compounded impulse turbine allows a bigger pressure drop and hence __________ numbers of stages are required.

  6. A.

     More

    B.

     Less

    C.

     Equal

    D.

     None of these


  7. The effect of friction on the flow of steam through a nozzle is to

  8. A.

     Decrease the mass flow rate and to increase the wetness of steam

    B.

     Increase the mass flow rate and to increase the exit temperature

    C.

     Decrease the mass flow rate and to decrease the wetness of steam

    D.

     Increase the exit temperature without any effect on mass flow rate


  9. The maximum discharge through a chimney occurs when the height of chimney is

  10. A.

     Infinitely long

    B.

     Around 200 meters

    C.

     Equal to the height of the hot gas column producing draught

    D.

     Outside temperature is very low


  11. When the speed of the crankshaft is between 100 r.p.m. and 250 r.p.m., the engine said to be a

  12. A.

     Slow speed engine

    B.

     Medium speed steam engine

    C.

     High speed steam engine

    D.

     None of these


  13. The cylindrical shell of a Lancashire boiler has diameter from

  14. A.

     1 to 2 m

    B.

     1.25 to 2.25 m

    C.

     1.5 to 2.5 m

    D.

     1.75 to 2.75 m


  15. The diameter of internal flue tubes of a Lancashire boiler is about _________ that of its shell.

  16. A.

     One-fourth

    B.

     One-third

    C.

     Two-fifth

    D.

     One-half


  17. The diameter of flue tube in a Cornish boiler is _________ that of the shell.

  18. A.

     One-fourth

    B.

     One-third

    C.

     Two-fifth

    D.

     Three-fifth


  19. Locomotive boiler is of the following type

  20. A.

     Multi tubular

    B.

     Horizontal

    C.

     Internally fired

    D.

     All of the above