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Mechanical Engineering :: Steam Nozzles and Turbines

  1. The critical pressure ratio is given by (where p₁ = Initial pressure of steam, and p₂ = Pressure of steam at throat or critical pressure)

  2. A.

     p₁. p₂

    B.

     p₁/p₂

    C.

     p₂/p₁

    D.

     p₁ + p₂

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  3. The discharge is __________ at critical pressure.

  4. A.

     Zero

    B.

     Minimum

    C.

     Maximum

    D.

     None of these

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  5. Fire tube boilers are limited to a maximum working pressure of

  6. A.

     0.17 MN/m²

    B.

     1.7 MN/m²

    C.

     17 MN/m²

    D.

     170 MN/m²

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  7. Fire tube boilers are limited to a maximum design working pressure of

  8. A.

     1 kg/cm

    B.

     6 kg/cm

    C.

     17 kg/cm²

    D.

     100 kg/cm²

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  9. The ratio of heat utilized to produce steam and the heat liberated in furnace is known as

  10. A.

     Boiler effectiveness

    B.

     Boiler evaporative capacity

    C.

     Factor of evaporation

    D.

     Boiler efficiency

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  11. In order to obtain superheated steam, a superheater is added in an existing boiler. As as result, furnace vacuum will

  12. A.

     Remain unaffected

    B.

     Improve

    C.

     Worsen

    D.

     May improve/worsen depending on size

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  13. When the speed of the engine is controlled by means of a valve in a steam pipe, which regulates the pressure of steam entering the engine, then the governing is known as

  14. A.

     Throttle governing

    B.

     Cut-off governing

    C.

     By-pass governing

    D.

     None of these

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  15. In a reaction turbine when the degree of reaction is zero, then there is

  16. A.

     No heat drop in moving blades

    B.

     No heat drop in fixed blades

    C.

     Maximum heat drop in moving blades

    D.

     Maximum heat drop in fixed blades

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  17. In a De-Laval nozzle expanding superheated steam from 10 bar to 0.1 bar, the pressure at the minimum cross-section (i. e. pressure at throat, p₂) will be

  18. A.

     3.3 bar

    B.

     5.46 bar

    C.

     8.2 bar

    D.

     9.9 bar

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  19. The water tubes in a simple vertical boiler are

  20. A.

     Horizontal

    B.

     Vertical

    C.

     Inclined

    D.

     None of these

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