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Chemical Engineering :: Fuels and Combustion

  1. Power alcohol as compared to straight run gasoline has lower

  2. A.
    calorific value
    B.
    octane number
    C.
    specific gravity
    D.
    viscosity

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  3. When the coal is heated in absence of air, it is called its

  4. A.
    deoxidation
    B.
    gasification
    C.
    coalification
    D.
    carbonisation

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  5. C.V. (kcal/Nm3) of gaseous fuels __________ with increase in molecular weight.

  6. A.
    decreases
    B.
    increases
    C.
    remains constant
    D.
    may increase or decrease, depends on combustibles.

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  7. Shatter index of the coke is a measure of its

  8. A.
    strength
    B.
    bulk density
    C.
    reactivity
    D.
    none of these

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  9. Narrow coke ovens as compared to wider coke ovens

  10. A.
    produce smaller coke.
    B.
    produce stronger coke.
    C.
    require less time of carbonisation.
    D.
    all (a), (b) and (c).

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  11. A carbonaceous fuel (containing no H2 or hydrocarbons) is burnt and the resulting flue gas contains 21% CO2. It means that

  12. A.
    21% excess air has been used for combustion.
    B.
    21% excess oxygen has been used for combustion.
    C.
    complete combustion of fuel has taken place.
    D.
    no excess air has been used for combustion.

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  13. Fusion point of coal ash generally varies from 1000 to 1700° C. Ash having fusion point less than __________ °C is liable to form clinker.

  14. A.
    1100
    B.
    1250
    C.
    1350
    D.
    1400

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  15. Light oil whose major component is benzol, is obtained by the distillation of crude tar in the temperature range of __________ °C.

  16. A.
    80-170
    B.
    200-300
    C.
    250-270
    D.
    280-300

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  17. Pick out the wrong statement.

  18. A.
    Main constituents of LPG are propane and butane.
    B.
    C.V. of natural gas is about 10000 KCal/Nm3.
    C.
    C.V. of LPG is about 26000 kcal/Nm3(11500 kcal/kg).
    D.
    L.P.G. is lighter than air.

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  19. With increase in C/H ratio of a fuel, the dew point of flue gases

  20. A.
    increases
    B.
    decreases
    C.
    remains same
    D.
    may increase or decrease ; depends on the type of fuel

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