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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. The heat of combustion of a fuel

    2. A.
    is equal to the heat of formation.
    B.
    is always negative.
    C.
    can't be known without calculating it.
    D.
    is always positive.

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  2. High excess air in combustion of fuels results in

    3. A.
    increased fuel consumption
    B.
    incomplete combustion
    C.
    smoky flame
    D.
    none of these

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  3. Abrasion index of blast furnace coke should be around __________ percent.

    4. A.
    20
    B.
    35
    C.
    55
    D.
    80

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  4. Tar yield in the low temperature and high temperature carbonisation of dry coal may be respectively __________ percent.

    5. A.
    3 & 10
    B.
    10 & 3
    C.
    10 & 20
    D.
    15 & 8

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  5. Cannel coal and boghead coal are the examples of

    6. A.
    humic coals
    B.
    liptobiolites
    C.
    sapropelic coals
    D.
    none of these

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  6. Which of the following combustibles is absent in blast furnace gas ?

    7. A.
    H2
    B.
    CH4
    C.
    CO
    D.
    none of these

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  7. The calorific value of producer gas is around __________ kcal/Nm3

    8. A.
    1300
    B.
    500
    C.
    4500
    D.
    9000

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  8. About __________ Nm3 of air will be required for the complete combustion of 2Nm3 of CO.

    9. A.
    2
    B.
    3
    C.
    5
    D.
    1

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  9. Coking time in beehive coke oven is about

    10. A.
    12 hours
    B.
    2-3 days
    C.
    one week
    D.
    two weeks

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  10. Which of the following has the highest calorific value ?

    11. A.
    Lignite
    B.
    Sub-bituminous coal
    C.
    Anthracite
    D.
    Peat

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