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Mechanical Engineering :: Steam Nozzles and Turbines

  1. In a steam engine, superheated steam from the boiler is fed into the steam chest at a pressure of

  2. A.

     10 atmospheres

    B.

     20 atmospheres

    C.

     30 atmospheres

    D.

     40 atmospheres


  3. The draught may be produced by a

  4. A.

     Mechanical fan

    B.

     Chimney

    C.

     A steam jet

    D.

     All of these


  5. At which pressure the properties of water and steam become identical

  6. A.

     0.1 kg/cm²

    B.

     1 kg/cm²

    C.

     100 kg/cm²

    D.

     225.6 kg/cm²


  7. The average operating pressure of Benson boiler is

  8. A.

     100 bar

    B.

     150 bar

    C.

     200 bar

    D.

     250 bar


  9. The rate of steam produced in Benson boiler is

  10. A.

     100 tonnes/h

    B.

     135 tonnes/h

    C.

     175 tonnes/h

    D.

     250 tonnes/h


  11. The effect of bleeding is that

  12. A.

     It increases the thermodynamic efficiency of the turbine

    B.

     Boiler is supplied with hot water

    C.

     It decreases the power developed by the turbine

    D.

     All of the above


  13. Which of the following is not a boiler mounting?

  14. A.

     Blow off cock

    B.

     Feed check valve

    C.

     Economiser

    D.

     Fusible plug


  15. The pressure of steam in the engine cylinder at the beginning of the stroke is ________ the boiler pressure.

  16. A.

     Equal to

    B.

     Less than

    C.

     Higher than

    D.

     None of these


  17. The heat balance sheet for the boiler shows the

  18. A.

     Complete account of heat supplied by 1 kg of dry fuel and the heat consumed

    B.

     Moisture present in the fuel

    C.

     Steam formed by combustion of hydrogen per kg of fuel

    D.

     All of the above


  19. Which of the following gases has the highest calorific value?

  20. A.

     Producer gas

    B.

     Coal gas

    C.

     Water gas

    D.

     Blast furnace gas