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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. Orsat apparatus is meant for

    2. A.
    gravimetric analysis of flue gas.
    B.
    finding out combustion efficiency.
    C.
    direct determination of nitrogen in flue gas by absorbing it in ammoniacal cuprous chloride.
    D.
    none of these.

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  2. Pick out the wrong statement.

    3. A.
    High concentration of oxygen in flue gas means high stack loss.
    B.
    Gaseous fuels require the least % excess air for complete combustion.
    C.
    The ratio of fixed carbon to volatile matter percentage in coal is called its 'fuel ratio'.
    D.
    Calorific value of natural gas is more than that of LPG.

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  3. Compound coke ovens are those which can be heated by

    4. A.
    both steam and electrical power.
    B.
    lean gas (e.g., B.F. gas).
    C.
    rich gas (e.g., coke oven gas).
    D.
    both (b) and (c).

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  4. Assam coals suffers mainly from the disadvantage of high __________ content.

    5. A.
    ash
    B.
    volatile matter
    C.
    sulphur (4-6%)
    D.
    moisture

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  5. Preheating of coal charge for the coke ovens reduces the

    6. A.
    time of carbonisation.
    B.
    yield of gas and tar.
    C.
    fuel consumption in coking.
    D.
    all (a), (b) and (c).

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  6. In high temperature carbonisation (as compared to low temperature carbonisation) of coal

    7. A.
    coke oven gas yield is more.
    B.
    tar yield is less but free carbon in tar is more.
    C.
    calorific value of coke oven gas is less.
    D.
    all (a), (b), and (c).

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  7. Anthracite coal

    8. A.
    contains more volatile matter than bituminous coal.
    B.
    ignites more easily than bituminous coal.
    C.
    is essentially a coking coal.
    D.
    burns with short, bluish, yellow-tipped flame producing very little smoke.

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  8. Number of macrocomponents present in coal according to Stopes are

    9. A.
    four
    B.
    five
    C.
    six
    D.
    two

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  9. The maximum adiabatic flame temperature in air as compared to that in pure oxygen is

    10. A.
    much lower.
    B.
    much higher.
    C.
    same.
    D.
    either lower or higher, depends on the type of fuel.

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  10. Yield of charcoal in high temperature carbonisation of wood is about __________ percent.

    11. A.
    10
    B.
    25
    C.
    50
    D.
    75

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