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Mechanical Engineering :: Steam Nozzles and Turbines

  1. Maximum energy loss in a boiler occurs due to

  2. A.

     Unburnt carbon in ash

    B.

     Incomplete combustion

    C.

     Ash content

    D.

     Flue gases

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  3. The impulse turbine rotor efficiency will have a maximum value of 0.5 cos 2α, where α is the nozzle exit flow angle, if the

  4. A.

     Blades are equiangular

    B.

     Blade velocity coefficient is unity

    C.

     Blades are equiangular and frictionless

    D.

     Blade solidity is 0.65

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  5. Which of the following substance will have same percentage in both proximate and ultimate analysis?

  6. A.

     Ash

    B.

     Volatile matter

    C.

     Moisture

    D.

     Hydrogen

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  7. An economiser is generally placed between

  8. A.

     Last superheater or reheater and air preheater

    B.

     Induced draft fan and forced draft fan

    C.

     Air preheater and chimney

    D.

     None of the above

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  9. All steam engines work on

  10. A.

     Zeroth law of thermodynamics

    B.

     First law of thermodynamics

    C.

     Second law of thermodynamics

    D.

     None of these

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  11. The basic purpose of drum in boiler is to

  12. A.

     Serve as storage of steam

    B.

     Serve as storage of feed water for water wall

    C.

     Remove salts from water

    D.

     Separate steam from water

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  13. A steam nozzle converts

  14. A.

     Heat energy of steam into kinetic energy

    B.

     Kinetic energy into heat energy of steam

    C.

     Heat energy of steam into potential energy

    D.

     Potential energy into heat energy of steam

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  15. The fire tubes in a Scotch marine boiler are

  16. A.

     Horizontal

    B.

     Vertical

    C.

     Inclined

    D.

     None of these

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  17. The fire tubes in, a Coarran and Scottish marine boiler are

  18. A.

     Horizontal

    B.

     Vertical

    C.

     Inclined

    D.

     Both horizontal and vertical

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  19. A safety valve mainly used with locomotive and marine boilers is

  20. A.

     Lever safety valve

    B.

     Dead weight safety valve

    C.

     High steam and low water safety valve

    D.

     Spring loaded safety valve

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