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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. __________ process is meant for direct hydrogenation of coal to produce liquid fuel.

    2. A.
    Fischer-Tropsch
    B.
    Bergius
    C.
    Lurgi
    D.
    None of these

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  2. Producer gas containing least amount of tar is produced by the

    3. A.
    partial combustion of coal.
    B.
    partial combustion of large size (< 50 mm) coke.
    C.
    high pressure gasification of coal (e.g. in Lurgi gasifier).
    D.
    atmospheric pressure gasification of coal (e.g., in Kopper-Totzek gasifier).

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  3. Air/gas ratio for complete combustion will be the highest for

    4. A.
    LPG
    B.
    gobar gas
    C.
    coke oven gas
    D.
    carburetted water gas

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  4. Beehive coke oven

    5. A.
    facilitates by-products recovery.
    B.
    takes 2-3 days for coking of coal but requires no external fuel for heating.
    C.
    gives larger yield of coke (around 85%) as compared to by-product ovens.
    D.
    produces coke with very poor strength.

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  5. Turndown ratio of a gas burner is equal to the

    6. A.
    maximum to minimum heat input ratio.
    B.
    maximum to minimum permissible gas flow rate.
    C.
    both (a) & (b).
    D.
    minimum to maximum heat input ratio.

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  6. Which of the following fuels is generally not used in thermal power plant boiler firing?

    7. A.
    Furnace oil, light diesel oil and tar/PCM.
    B.
    Pulverised coking coal.
    C.
    Coal middling from washeries.
    D.
    B.F. gas, coke oven gas and L.D. converter gas.

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  7. A sooty flame can be made non-luminous by

    8. A.
    admitting more gas.
    B.
    shutting gas supply.
    C.
    admitting more air.
    D.
    shutting air supply.

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  8. A coal that softens and fuses on heating is

    9. A.
    classified
    B.
    carbonised
    C.
    caking
    D.
    non-caking

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  9. Which of the following reactions occuring during coal gasification is called the Neumann reversal reaction ?

    10. A.
    2CO C + CO2
    B.
    CO + H2O CO2 + H2
    C.
    C + H2O CO + H2
    D.
    C + 2H2O CO2 + 2H2

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  10. 'Mixed gas' used in steel plants is a mixture of

    11. A.
    B.F. gas and coke oven gas.
    B.
    coke oven gas and converter gas.
    C.
    coke oven gas and L.P.G.
    D.
    blast furnace gas and naphtha vapor.

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