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Chemical Engineering :: Fuels and Combustion

Fuels and Combustion - Section 1
Fuels and Combustion - Section 2
Fuels and Combustion - Section 3
Fuels and Combustion - Section 4
Fuels and Combustion - Section 5
Fuels and Combustion - Section 6
Fuels and Combustion - Section 7
Fuels and Combustion - Section 8
Fuels and Combustion - Section 9
Fuels and Combustion - Section 10

  1. During coking of coal, the ash content (percentage)

    2. A.
    increases
    B.
    decreases
    C.
    remains constant
    D.
    -

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  2. Furnace oil consumption in a furnace for a given duty employing preheated combination air (at 300° ) may be reduced by about __________ percent as compared to the use of atmospheric combustion air.

    3. A.
    5
    B.
    10
    C.
    20
    D.
    35

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  3. The main reason for making the copper calorimeter (used in bomb calorimeter) silvery white and shining/polished is to

    4. A.
    minimise its corrosion.
    B.
    avoid radiation heat loss.
    C.
    make it look attractive.
    D.
    none of these.

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  4. The weathering index of a coal

    5. A.
    gives an idea of the fusion temperature of ash.
    B.
    is related to its calorific value.
    C.
    is a measure of its size stability, when stored & exposed to weather.
    D.
    is a measure of its caking tendency.

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  5. Bright coal

    6. A.
    contains more than 90% durain.
    B.
    contains more than 90% fussain.
    C.
    contains mainly vitrain & clarain and is generally coking.
    D.
    is non-coking.

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  6. Washing of coal

    7. A.
    reduces its ash & sulphur content.
    B.
    improves its coking properties.
    C.
    increase the fusion point of its ash by removing chlorine compounds.
    D.
    all (a), (b) and (c).

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  7. Calorific value of of blast furnace gas is around __________ KCal/Nm3.

    8. A.
    850
    B.
    1800
    C.
    4200
    D.
    6500

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  8. In low temperature carbonisation of coal as compared to high temperature carbonisation __________ produced is less.

    9. A.
    difference in gross & net calorific value of the coke oven gas
    B.
    free carbon content in tar
    C.
    yield percentage of coke
    D.
    yield of ammonia present in coke oven gas

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  9. Coal tar (produced by high temperature carbonisation) is the main source of

    10. A.
    aromatic compounds
    B.
    alphatic compounds
    C.
    paraffins
    D.
    olefins

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  10. The calorific value is the highest out of the following for

    11. A.
    producer gas
    B.
    water gas
    C.
    coke oven gas
    D.
    blast furnace gas

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