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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

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

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

  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.

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

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

  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).

  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.

  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

  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

  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.

  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