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Mechanical Engineering :: Steam Nozzles and Turbines

Steam Nozzles and Turbines - Section 1
Steam Nozzles and Turbines - Section 2
Steam Nozzles and Turbines - Section 3
Steam Nozzles and Turbines - section-4
  1. Coke is produced by

    2. A.

     Pulverizing coal in inert atmosphere
    B.

     Heating wood in a limited supply of air at temperatures below 300°C
    C.

     Strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel
    D.

     Enriching carbon in the coal

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  2. A throttle governed steam engine develops 15 kW with 280 kg per hour of steam and 35 kW with 520 kg per hour of steam. The steam consumption in kg per hour when developing 20 kW will be nearly

    3. A.

     150 kg/h
    B.

     210 kg/h
    C.

     280 kg/h
    D.

     340 kg/h

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  3. Thermal efficiency of well maintained boiler will be of the order

    4. A.

     40 %
    B.

     50 %
    C.

     75 %
    D.

     90 %

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  4. The amount of water evaporated in kg per kg of fuel burnt is called

    5. A.

     Evaporative capacity of a boiler
    B.

     Equivalent evaporation from and at 100° C
    C.

     Boiler efficiency
    D.

     None of these

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  5. Pick up the correct statement as regards Cornish boiler and Lancashire boiler

    6. A.

     Cornish is fire tube and Lancashire is water tube
    B.

     Cornish is water tube and Lancashire is fire tube
    C.

     Cornish has two fire tubes and Lancashire has one
    D.

     Lancashire has two fire tubes and Cornish has one

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  6. The diameter of tubes for natural circulation boiler as compared to controlled circulation boilers is

    7. A.

     More
    B.

     Less
    C.

     Same
    D.

     Could be more or less depending on other factors

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  7. The flow through a nozzle is regarded as

    8. A.

     Constant volume flow
    B.

     Constant pressure flow
    C.

     Isothermal flow
    D.

     Isentropic flow

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  8. The efficiency of a boiler is defined as

    9. A.

     Ratio of heat actually used in producing steam to the heat liberated in the furnace
    B.

     Ratio of the mass of steam produced to the mass of total water supplied in a given time
    C.

     Ratio of the heat liberated in the furnace to the heat actually used in producing steam
    D.

     None of the above

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  9. The maximum steam pressure in a Locomotive boiler is limited to

    10. A.

     0.18 MN/m²
    B.

     1.8 MN/m²
    C.

     18 MN/m²
    D.

     180 MN/m²

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  10. The maximum heat loss is a boiler occurs due to

    11. A.

     Moisture in fuel
    B.

     Dry flue gases
    C.

     Steam formation
    D.

     Unburnt carbon

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