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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. Fischer-Tropsch method aims at the

    2. A.
    gasification of coal.
    B.
    synthesis of gasoline (from water gas).
    C.
    hydrogenation of coal to produce gasoline.
    D.
    none of these.

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  2. To avoid fire by spontaneous combustion of coal due to its low temperature oxidation, it should be stored in

    3. A.
    shallow and small piles.
    B.
    fine sizes without the presence of any lump.
    C.
    closed space without any ventilation facility.
    D.
    large heaps with small surface to volume ratio.

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  3. Artificial draught produced by a fan can be controlled by the

    4. A.
    speed of the fan.
    B.
    damper.
    C.
    variation in the pitch of the fan blades.
    D.
    all (a), (b)and(c).

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  4. Water gas constitutes mainly of

    5. A.
    CO & H2
    B.
    CO & N2
    C.
    CO2 & H2
    D.
    CH4 & H2

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  5. Coke made in narrower by-product coke ovens (as compared to wider ovens) is

    6. A.
    less reactive
    B.
    stronger
    C.
    smaller in size
    D.
    all (a), (b) & (c)

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  6. Main constituent of the gas produced from a gobar gas plant is

    7. A.
    CO2
    B.
    CH4
    C.
    H2
    D.
    CO

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  7. Steam is intermittently admitted into the fuel bed during the production of producer gas to

    8. A.
    convert CO to CO2.
    B.
    increase the combustion rate.
    C.
    increase the gas production rate.
    D.
    minimise the chances of clinker formation.

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  8. In general, the limit of inflammability/explosion limit of fuel gases is widened by the

    9. A.
    increase in gas pressure.
    B.
    increase in temperature (i.e. preheating).
    C.
    use of pure oxygen for combustion instead of air.
    D.
    all (a), (b) & (c).

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  9. Caking coal is desirable for

    10. A.
    burning on travelling grate.
    B.
    coke making.
    C.
    burning on firebars.
    D.
    all (a), (b) and (c).

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  10. Blast furnace gas compared to coke oven gas has

    11. A.
    lower ignition temperature.
    B.
    narrower limit of inflammability.
    C.
    higher calorific value.
    D.
    lower theoretical flame temperature.

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