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Mechanical Engineering :: Steam Nozzles and Turbines

  1. The velocity of steam leaving the nozzle (V) is given by (where K = Nozzle coefficient or nozzle efficiency, and hd = Enthalpy or heat drop during expansion of steam in a nozzle)

  2. A.

     V = 44.72 hd K

    B.

     V = 44.72 K hd

    C.

     V = 44.72 K hd

    D.

     V = 44.72 K hd

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  3. Reheating of steam in a turbine

  4. A.

     Increases the work-done through the turbine

    B.

     Increases the efficiency of the turbine

    C.

     Reduces wear on the blades

    D.

     All of these

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  5. If the critical pressure ratio for steam is 0.546, then the steam is initially

  6. A.

     Wet steam

    B.

     Dry saturated steam

    C.

     Superheated steam

    D.

     None of these

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  7. The function of injector used in small steam plants is to

  8. A.

     Create vacuum in furnace

    B.

     Create vacuum at turbine exhaust

    C.

     Pump feed water

    D.

     Dose chemicals in feed water

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  9. A condenser where circulating water flows through tubes which are surrounded by steam, in known as

  10. A.

     Surface condenser

    B.

     Jet condenser

    C.

     Barometric condenser

    D.

     Evaporative condenser

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  11. A wet vapor can be completely specified by

  12. A.

     Pressure only

    B.

     Temperature only

    C.

     Dryness fraction only

    D.

     Pressure and dryness fraction

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  13. A turbine is said to have an axial discharge when the steam leaves the blade tip at _________ to the direction of the blade motion.

  14. A.

     60°

    B.

     90°

    C.

     180°

    D.

     270°

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  15. The draught (in mm of water), for maximum discharge of flue gases through the chimney, is given by (where H = Height of the chimney in meters, and T1 = Absolute temperature of air outside the chimney in K)

  16. A.

     T1 /88.25H

    B.

     88.25H/T1

    C.

     T1 /176.5H

    D.

     176.5H/T1

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  17. In a reaction turbine, when steam flows through the fixed blades,

  18. A.

     Pressure increases while velocity decreases

    B.

     Pressure decreases while velocity increases

    C.

     Pressure and velocity both decreases

    D.

     Pressure and velocity both increases

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  19. Over fire burning is the phenomenon of

  20. A.

     Supply of excess, air

    B.

     Supply of excess coal

    C.

     Burning CO and unburnt in upper zone of furnace by supplying more air

    D.

     Fuel bed firing

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