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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. Quantity of coke oven gas produced by high temperature carbonisation of one ton of dry coal may be around __________ Nm3 .

    2. A.
    30
    B.
    300
    C.
    3000
    D.
    30, 000

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  2. Coking coals are invariably

    3. A.
    lignites
    B.
    bituminous coals
    C.
    semi-anthracites
    D.
    anthracites

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  3. Which of the following accounts for maximum energy loss in a boiler ?

    4. A.
    Flue gases.
    B.
    Ash content in the fuel.
    C.
    Incomplete combustion.
    D.
    Unburnt carbon in flue gases.

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  4. 'Fuel' can be defined as a substance which produces heat by

    5. A.
    combustion.
    B.
    nuclear fission.
    C.
    nuclear fusion.
    D.
    all (a), (b) & (c).

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  5. Washing of coal

    6. A.
    reduces its sulphur and ash content.
    B.
    controls its ash fusibility and increases its calorific value.
    C.
    improves its coking properties.
    D.
    all (a), (b) and (c).

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  6. High ash coals

    7. A.
    are soft & friable (poor strength and size stability).
    B.
    require longer time of carbonisation as ash offers resistance to heat transfer.
    C.
    produce larger quantity of coke oven gas.
    D.
    none of these.

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

    8. A.
    Pitch
    B.
    Blast furnace gas
    C.
    Petrol
    D.
    Refinery gas

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  8. Preheating of combustion air is done to

    9. A.
    increase the adiabatic flame temperature.
    B.
    increase the calorific value of the fuel.
    C.
    complete the combustion of fuel.
    D.
    reduce its requirement for effecting the complete combustion.

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  9. Gross heating value of coal is __________ the net heating value.

    10. A.
    higher than
    B.
    lower than
    C.
    same as
    D.
    either (a) or (b); depends on the type of coal

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  10. Anthracite can be used for

    11. A.
    recarbonising steel.
    B.
    making carbon electrodes;
    C.
    blending with highly coking coal to check its swelling which helps in saving coke even walls from damage and to produce high strength coke.
    D.
    all (a), (b) and (c).

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