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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. Percentage of nitrogen in blast furnace gas may be around

    2. A.
    5
    B.
    25
    C.
    55
    D.
    80

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  2. Very __________ coals are completely devoid of cokability i.e, it is non coking.

    3. A.
    young
    B.
    mature
    C.
    both 'a' & 'b'
    D.
    neither 'a' nor 'b'

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  3. Nitrogen in coal

    4. A.
    is present upto 1-2%.
    B.
    comes from protein in parent vegetable matter.
    C.
    is recovered as ammonia during its carbonisation.
    D.
    all (a), (b) and (c).

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  4. Advantages of fluidised bed combustion are

    5. A.
    reduced NOx formation in flue gas.
    B.
    lower furnace operating temperature.
    C.
    high heat transfer rate.
    D.
    all (a), (b) & (c).

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  5. The fuel ratio of a coal is

    6. A.
    the ratio of its percentage of fixed carbon to that of volatile matter.
    B.
    helpful in estimation of its rank.
    C.
    both (a) and (b).
    D.
    neither (a) nor (b).

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  6. Ash content in the coke produced from a coking coal having 20% ash may be around __________ percent.

    7. A.
    6
    B.
    12
    C.
    18
    D.
    24

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  7. Which of the following is not endothermic?

    8. A.
    Cracking
    B.
    Reforming
    C.
    Gasification
    D.
    Partial oxidation

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  8. High sulphur content in a fuel __________ of the flue gases.

    9. A.
    decreases the dew point
    B.
    increases the dew point
    C.
    reduces the combustion efficiency by limiting the permissible temperature reduction
    D.
    , both (b) and (c)

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  9. Ash content in the middling coal (a byproduct of coal washeries) in India ranges between __________ percent.

    10. A.
    15 to 25
    B.
    35 to 45
    C.
    55 to 75
    D.
    75

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  10. Fuel combustion is never cent per cent efficient due to

    11. A.
    incomplete combustion
    B.
    dry gas/stack gas loss
    C.
    moisture loss
    D.
    all (a), (b) and (c)

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