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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. A coal gasifier opearating at 20 atm. (e.g. Lugri gasifier) as compared to one operating at atmospheric pressure (e.g. Kopper-Totzek or Winkler gasifier) will produce a gas having

    2. A.
    higher methane content and thus higher calorific value.
    B.
    higher carbon monoxide content.
    C.
    lower carbon dioxide content.
    D.
    none of these.

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  2. Combustion of pulverised fuel

    3. A.
    requires larger combustion chamber than rich gaseous fuel.
    B.
    in a metallurgical furnace does not contaminate the product in the furnace by ash from fuel.
    C.
    suppresses the discharge of fine dust and grit into atmosphere
    D.
    all (a), (b) and (c)

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  3. Gasification of the solid fuel converts its organic part into combustible by interaction with air/oxygen and steam so as to obtain a secondary gaseous fuel of high calorific value having no ash. Gasification reactions are normally carried out at about __________ °C.

    4. A.
    400-500
    B.
    900-1000
    C.
    1400-1500
    D.
    1700-1800

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  4. Low temperature oxidation of coal during storage does not decrease its

    5. A.
    oxygen content
    B.
    caking power
    C.
    calorific value
    D.
    none of these

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  5. With increase in the oxygen content of the coal, its __________ decreases.

    6. A.
    calorific value
    B.
    caking power
    C.
    both (a) & (b)
    D.
    neither (a) nor (b)

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  6. The shift conversion reaction taking place during water gas manufacture is given by

    7. A.
    C + H2O CO + H2
    B.
    C + 2H2O CO2 + 2H2
    C.
    CO + H2O CO2 + H2
    D.
    none of these

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  7. Which of the following is unsuitable fuel for producer gas manufacture ?

    8. A.
    Coke.
    B.
    Anthracite.
    C.
    Coal having low fusion point of its ash.
    D.
    Coal having high fusion point of its ash.

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  8. A good metallurgical coke

    9. A.
    should have high porosity.
    B.
    should be brittle.
    C.
    must contain moderate quantities of ash, moisture, sulphur and volatile matters.
    D.
    should have low fusion point of its ash.

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  9. The main advantage of forced draft over natural draft is that

    10. A.
    combustion of fuel is complete.
    B.
    smaller height chimney can be used.
    C.
    furnace control is easier.
    D.
    all (a), (b) & (c).

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  10. Benzene is used

    11. A.
    as a motor fuel.
    B.
    as an explosive.
    C.
    for making insecticides (e.g., DDT, BHC etc.), detergent & rubber (SBR).
    D.
    as a perfume.

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