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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. Washing of coal decreases its

    2. A.
    caking index.
    B.
    mineral matter content.
    C.
    ash content.
    D.
    both (b) and (c).

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  2. Which of the following petrographic constituents of coal is non-coking ?

    3. A.
    Vitrain
    B.
    Clarain
    C.
    Durain
    D.
    Fussain

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  3. __________ has the widest inflammability limit (explosion limit) of all the gases.

    4. A.
    Hydrogen
    B.
    Carbon monoxide
    C.
    Acetylene
    D.
    Methane

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  4. Percentage of methane in coke oven gas may be around

    5. A.
    5
    B.
    15
    C.
    25
    D.
    50

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  5. Orsat apparatus

    6. A.
    gives flue gas analysis on dry basis.
    B.
    determines N2 in flue gas indirectly.
    C.
    can't determine CO in flue gas, if it is < 0.2%.
    D.
    all (a), (b) & (c).

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  6. In flue gas analysis by Orsat's apparatus, carbon dioxide is absorbed by

    7. A.
    potassium hydroxide.
    B.
    dilute potassium carbonate.
    C.
    cuporus chloride.
    D.
    alkaline pyragllol solution.

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  7. Caking index of the coal blend used for the manufacture of metallurgical coke should be around

    8. A.
    5
    B.
    21
    C.
    40
    D.
    48

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  8. With increase in moisture content of coal, its

    9. A.
    calorific value increases sometimes.
    B.
    bulk density always decreases.
    C.
    clinkering tendency during combustion increases.
    D.
    none of these.

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  9. Proximate analysis of coal determines its __________ content.

    10. A.
    moisture, ash, sulphur & volatile matter.
    B.
    moisture, volatile matter, ash & fixed carbon.
    C.
    moisture, sulphur, nitrogen & fixed carbon.
    D.
    none of these.

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  10. Presence of free moisture in coal is most disadvantageous during

    11. A.
    its pulverisation (as it requires more power).
    B.
    combustion of fire slacks on the grates.
    C.
    handling (e.g. when emptying wagons).
    D.
    none of these.

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