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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. C/H ratio is the maximum in case of

    2. A.
    coal
    B.
    furnace oil
    C.
    natural gas
    D.
    naphtha

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  2. Incomplete combustion of a fuel is characterised by the high __________ in the flue gas.

    3. A.
    smoke
    B.
    temperature
    C.
    oxygen
    D.
    carbon monoxide

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  3. Low temperature oxidation of stored coal results in the

    4. A.
    decrease in its caking power & calorific value.
    B.
    decrease in its carbon & hydrogen content.
    C.
    increase in its oxygen content.
    D.
    all (a), (b) and (a).

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  4. Gross calorific value will be equal to the net calorific value for

    5. A.
    H2
    B.
    C2H2
    C.
    CO
    D.
    C2H6

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  5. Bulk density of pulverised coal may be about __________ kg/m3.

    6. A.
    100
    B.
    500
    C.
    1000
    D.
    1500

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  6. Pulverised coal used in boiler firing need not have

    7. A.
    less moisture content
    B.
    high fusion point of its ash
    C.
    high bulk density
    D.
    lower ash content

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  7. Lurgi coal gasifier is a pressurised __________ bed reactor.

    8. A.
    moving
    B.
    fixed
    C.
    fluidised
    D.
    entrained

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  8. Which is the most matured coal ?

    9. A.
    Lignite
    B.
    Bituminous
    C.
    Semi-anthracite
    D.
    Anthracite

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  9. The average molecular weight of a flue gas having the composition by volume as CO2 = 25%, O2 = 25%, N2 = 50% will be

    10. A.
    27.6
    B.
    23
    C.
    47.3
    D.
    42.9

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  10. Caking index of coal blend used for blast furnace coke making is about

    11. A.
    8
    B.
    12
    C.
    22
    D.
    36

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