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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. Higher efficiency in the combustion of solid fuel can not be achieved by

    2. A.
    proper fuel preparation.
    B.
    keeping the flue gas exhaust temperature very high.
    C.
    adopting efficient-fuel firing technique & equipment.
    D.
    supplying correct quantity of combustion air.

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  2. A coal containing very high percentage of durain is called __________ coal.

    3. A.
    bright
    B.
    splint
    C.
    non-banded
    D.
    boghead

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  3. During combustion of gaseous fuels, deficiency of air

    4. A.
    lengthens the flame.
    B.
    tends to shorten the flame.
    C.
    does not affect the flame length.
    D.
    increases the flame temperature.

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  4. Gross and net calorific value of a fuel will be the same

    5. A.
    if its ash content is zero.
    B.
    ifits carbon content is very low.
    C.
    if its hydrogen/hydrogen compound content is zero.
    D.
    under no circumstances.

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  5. Low temperature carbonisation

    6. A.
    is mainly for producing the smokeless domestic coke.
    B.
    is meant for the production of 'metallurgical coke'.
    C.
    produces higher quantity of gas than high temperature carbonisation.
    D.
    produces less quantity of tar than high temperature carbonisation.

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  6. Which of the following is not used as a binder in coal briquetting ?

    7. A.
    Tar
    B.
    Molasses
    C.
    Pitch
    D.
    Line

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  7. Size of blast furnace grade coke is __________ mm.

    8. A.
    25-80
    B.
    0-15
    C.
    15-25
    D.
    >100

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  8. Presence of __________ in a dry gaseous fuel does not contribute to its calorific value.

    9. A.
    sulphur
    B.
    oxygen
    C.
    hydrogen
    D.
    carbon

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  9. The internal energy of the combustion products is __________ compared to that of reactants.

    10. A.
    more
    B.
    less
    C.
    equal
    D.
    more or less ; (depends on the state of fuel.)

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  10. Which of the following is not a product of tar distillation ?

    11. A.
    Phenol & naphthalene
    B.
    Benzol & pitch
    C.
    Anthracene & creosote
    D.
    None of these

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