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Mechanical Engineering :: Steam Nozzles and Turbines

  1. Which of the following coals has the highest calorific value?

  2. A.

     Anthracite coal

    B.

     Bituminous coal

    C.

     Lignite

    D.

     Peat

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  3. Which type of boiler can meet rapid changes of load?

  4. A.

     Vertical fire tube type

    B.

     Horizontal fire tube type

    C.

     Horizontal water tube type

    D.

     Forced circulation type

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  5. Which of the following boiler is best suited to meet the fluctuating demand of steam?

  6. A.

     Locomotive boiler

    B.

     Lancashire boiler

    C.

     Cornish boiler

    D.

     Babcock and Wilcox boiler

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  7. A nozzle is said to be a divergent nozzle

  8. A.

     When the cross-section of the nozzle increases continuously from entrance to exit

    B.

     When the cross-section of the nozzle decreases continuously from entrance to exit

    C.

     When the cross-section of the nozzle first decreases from entrance to throat and then increases from its throat to exit

    D.

     None of the above

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  9. The compounding of turbines is done in order to

  10. A.

     Reduce speed of rotor

    B.

     Improve efficiency

    C.

     Reduce exit losses

    D.

     All of these

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  11. The function of an eccentric rod is

  12. A.

     To provide reciprocating motion to the slide valve

    B.

     To convert reciprocating motion of the piston into rotary motion of the crank

    C.

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

    D.

     To provide simple harmonic motion to the D-slide valve

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  13. A double acting steam engine with a cylinder diameter of 190 mm and a stroke of 300 mm has a cut-off of 0.35. The expansion ratio for this engine is nearly

  14. A.

     1.05

    B.

     2.86

    C.

     6.65

    D.

     10.05

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  15. Steam in water tube boiler as compared to fire tube boiler

  16. A.

     Can be raised rapidly

    B.

     Is raised at slower rate

    C.

     Is raised at same rate

    D.

     Could be raised at fast/slow rate depending on design

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  17. Thermal equilibrium means that the flow of steam is

  18. A.

     Isothermal

    B.

     Isentropic

    C.

     Hyperbolic

    D.

     Polytropic

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  19. A supercritical boiler is one that operates above the pressure and temperature of following values

  20. A.

     100 kg/cm² and 540°C

    B.

     1 kg/cm² and 100°C

    C.

     218 kg/cm² abs and 373°C

    D.

     218 kg/cm² abs and 540°C

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