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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 maximum adiabatic flame temperature in air is __________ the maximum flame temperature in pure oxygen.

    2. A.
    lower than
    B.
    higher than
    C.
    same as
    D.
    not related to

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  2. Which of the following gaseous fuels has the highest net calorific value (kcal/Nm3)?

    3. A.
    Producer gas
    B.
    Carburetted water gas
    C.
    Natural gas
    D.
    Liquified petroleum gas

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  3. Which of the following is coking ?

    4. A.
    Vitrain
    B.
    Fussain
    C.
    both (a) & (b)
    D.
    Neither (a) nor (b)

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  4. Undercharging of coal in the by-product coke ovens results in

    5. A.
    decrease in the c.v. of coke oven gas.
    B.
    increase in its throughput.
    C.
    increase in the c.v. of coke oven gas.
    D.
    no change in the c.v. of coke oven gas.

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  5. During the carbonisation of coal

    6. A.
    all tar is evolved at < 600°C.
    B.
    evolution of H2 and formation of methane and aromatics occur at > 700°C.
    C.
    hard semi-coke starts shrinking at 600°C.
    D.
    all (a), (b) and (c).

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  6. Which of the following petrological constitutes is responsible for bright and lustrous black band of bituminous coal ?

    7. A.
    Vitrain
    B.
    Clarain
    C.
    Durain
    D.
    Fussain

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  7. Which of the following is not a by-product fuel?

    8. A.
    Sewage gas
    B.
    Refinery gas
    C.
    Producer gas
    D.
    Bagasse

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  8. White flue gas (resembling steam) coming out of the chimney of a thermal power plant indicates that the fuel used in the boiler furnace is

    9. A.
    tar
    B.
    coke oven gas
    C.
    pitch
    D.
    pulverised coke

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  9. Too much of excess air in combustion results in high

    10. A.
    fuel consumption for the same heat load.
    B.
    stack gas temperature.
    C.
    percentage of oxygen in flue gases.
    D.
    all (a), (b) and (c).

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  10. A fuel with high heat release rate will

    11. A.
    require smaller combustion chamber.
    B.
    have high calorific value.
    C.
    have high adiabatic flame temperature.
    D.
    none of these.

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