Home / Mechanical Engineering / Steam Nozzles and Turbines :: section-4

Mechanical Engineering :: Steam Nozzles and Turbines

  1. Calorific value of coal is of the order of

  2. A.

     200-400 kcal/ kg

    B.

     800-1200 kcal/ kg

    C.

     2000-4000 kcal/ kg

    D.

     5000-8000 kcal/ kg


  3. The diameter of cylindrical shell of the Lancashire boiler is of the order of

  4. A.

     1 to 1.25 m

    B.

     1 to 1.75 m

    C.

     2 to 4 m

    D.

     1.75 to 2.75 m


  5. The coal requirement per kW hour generation in the thermal power plant is of the order of

  6. A.

     0.1 to 0.2 kg

    B.

     0.2 to 0.4 kg

    C.

     0.6 to 0.8 kg

    D.

     1.0 to 1.5 kg


  7. Tertiary air is the air used to

  8. A.

     Provide air around burners for obtaining optimum combustion

    B.

     Transport and dry the coal

    C.

     Cool the scanners

    D.

     Convert CO (formed in lower zone of furnace) into CO₂ at higher zone


  9. Primary air is the air used to

  10. A.

     Provide air around burners for obtaining optimum combustion

    B.

     Transport and dry the coal

    C.

     Convert CO (formed in lower zone of furnace) into CO₂ at higher zone

    D.

     Air delivered by forced draft fan


  11. Secondary air is the air used to

  12. A.

     Provide air around burners for obtaining optimum combustion

    B.

     Transport and dry the coal

    C.

     Convert CO (formed in lower zone of furnace) into CO₂ at higher zone

    D.

     Air delivered by induced draft fan


  13. The steam enters the nozzle at a

  14. A.

     High pressure and a low velocity

    B.

     High pressure and a high velocity

    C.

     Low pressure and a low velocity

    D.

     Low pressure and a high velocity


  15. The steam leaves the nozzle at a

  16. A.

     High pressure and a low velocity

    B.

     High pressure and a high velocity

    C.

     Low pressure and a low velocity

    D.

     Low pressure and a high velocity


  17. The critical pressure at which latent heat of vaporisation is zero is

  18. A.

     225.65 kgf/ cm²

    B.

     273 kgf/ cm²

    C.

     100 kgf/ cm²

    D.

     1 kgf/ cm²


  19. In a nozzle, the effect of super-saturation is to

  20. A.

     Decrease dryness fraction of steam

    B.

     Decrease specific volume of steam

    C.

     Increase the entropy

    D.

     Increase the heat drop