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Mechanical Engineering :: Steam Nozzles and Turbines

  1. The draught in locomotive boilers is produced by a

  2. A.

     Chimney

    B.

     Centrifugal fan

    C.

     Steam jet

    D.

     None of these

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  3. The function of a cross-head is to guide motion of the _________ and to prevent it from bending.

  4. A.

     Piston rod

    B.

     Connecting rod

    C.

     Eccentric rod

    D.

     Valve rod

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  5. 1 kg.m is equal to

  6. A.

     9.81 Joules

    B.

     102 Joules

    C.

     427 Joules

    D.

     None of these

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  7. The working pressure range for a LaMont boiler is

  8. A.

     0.5 to 10 MN/m²

    B.

     1 to 15 MN/m²

    C.

     2.5 to 15 MN/m²

    D.

     3.5 to 20 MN/m²

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  9. By compounding the expansion of steam in two or more cylinders, the length of stroke

  10. A.

     Does not change

    B.

     Increases

    C.

     Decreases

    D.

     None of these

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  11. A device used to put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit, is called

  12. A.

     Blow off cock

    B.

     Stop valve

    C.

     Superheater

    D.

     None of these

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  13. The function of a flywheel is

  14. A.

     To convert reciprocating motion of the piston into rotary motion

    B.

     To convert rotary motion of the crankshaft into to and fro motion of the valve rod

    C.

     To prevent fluctuation of speed

    D.

     To keep the engine speed uniform at all load conditions

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  15. Ultimate analysis of fuel is determination of percentage of

  16. A.

     Carbon, hydrogen, nitrogen, sulphur, moisture

    B.

     Fixed carbon, ash, volatile matter, moisture

    C.

     Higher calorific value

    D.

     Lower calorific value

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  17. Proximate analysis of fuel is determination of percentage of

  18. A.

     Carbon, hydrogen, nitrogen, sulphur, moisture

    B.

     Fixed carbon, ash, volatile matter, moisture

    C.

     Higher calorific value

    D.

     Lower calorific value

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  19. A single stage impulse turbine with a diameter of 1.2 m runs at 3000 r.p.m. If the blade speed ratio is 0.42, then the inlet velocity of steam will be

  20. A.

     79 m/s

    B.

     188 m/s

    C.

     450 m/s

    D.

     900 m/s

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