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Mechanical Engineering :: Steam Nozzles and Turbines

  1. The ratio of the temperature rise of cooling water to the vacuum temperature minus inlet cooling water temperature is called

  2. A.

     Condenser efficiency

    B.

     Vacuum efficiency

    C.

     Nozzle efficiency

    D.

     Boiler efficiency

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  3. Lancashire boiler has __________ internal flue tubes.

  4. A.

     One

    B.

     Two

    C.

     Three

    D.

     Four

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  5. Pick up wrong statement about desired properties of a good fuel

  6. A.

     High calorific value

    B.

     Produce minimum smoke and gases

    C.

     Ease in storing

    D.

     High ignition point

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  7. For a Parson's reaction turbine, if α₁ and α₂ are fixed blade angles at inlet and exit respectively and β₁ and β₂ are the moving blade angles at entrance and exit respectively, then

  8. A.

     α₁ = α₂ and β₁ = β₂

    B.

     α₁ = β₁ and α₂= β₂

    C.

     α₁ < β₁ and α₂ > β₂

    D.

     α₁ = β₂ and β₁ = α₂

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  9. A device used to increase the temperature of saturated steam without raising its pressure, is called

  10. A.

     Blow off cock

    B.

     Fusible plug

    C.

     Superheater

    D.

     Stop valve

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  11. In order to reduce the rotor speed of an impulse turbine, the method employed is

  12. A.

     Velocity compounding

    B.

     Pressure compounding

    C.

     Pressure-velocity compounding

    D.

     All of these

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  13. The velocity of flue gases (V) through the chimney under a static draught of (H') metres is given by

  14. A.

     V = 2g H'

    B.

     V = 2g/H'

    C.

     V = H'/2g

    D.

     V = 2gH'

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  15. The function of a piston rod is

  16. A.

     To guide motion of the piston rod and to prevent it from bending

    B.

     To transfer motion from the piston to the cross head

    C.

     To convert heat energy of the steam into mechanical work

    D.

     To exhaust steam from the cylinder at proper moment

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  17. For burning 1 kg of carbon to CO as per chemically correct combustion, amount of air required is

  18. A.

     1 kg

    B.

     4/3 kg

    C.

     8/3 kg

    D.

     2 kg

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  19. The ratio of the work-done on the blades per kg of steam to the total energy supplied per stage per kg of steam is called

  20. A.

     Blading efficiency

    B.

     Nozzle efficiency

    C.

     Stage efficiency

    D.

     Mechanical efficiency

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