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Chemical Engineering :: Fuels and Combustion

  1. Junker's calorimeter is used to determine the calorific value of

  2. A.
    pulverised coal
    B.
    gaseous fuels
    C.
    fuel oil
    D.
    none of these

  3. Combustion reaction of fuels is a/an __________ reaction.

  4. A.
    auto catalytic
    B.
    exothermic
    C.
    endothermic
    D.
    none of these

  5. Improper storage condition results in the weathering of coal and spontaneous combustion, which increases its

  6. A.
    caking index.
    B.
    yield of carbonised products.
    C.
    friability & oxygen content.
    D.
    calorific value.

  7. Which of the following constituents of coal is the most important in the production of coke?

  8. A.
    Moisture
    B.
    Ash
    C.
    Volatiles
    D.
    Carbon

  9. High temperature in gasification of coal favours

  10. A.
    high production of CO2.
    B.
    low production of CO2.
    C.
    high production of CO.
    D.
    both (b) and (c).

  11. Pick out the wrong statement.

  12. A.
    LPG is also used as fuel for automobiles & small furnaces and for cutting & welding of metals.
    B.
    The minimum temperature, at which a petroleum oil vapor catches fire and continues to burn, is called its flash point.
    C.
    Each ton of petroleum oil on distillation produces about 30-50 Nm3 of gas.
    D.
    Maximum yield of naphthalene is obtained on distillation of crude oil.

  13. Stack heat losses can be minimised by

  14. A.
    controlling the excess air.
    B.
    oxygen enrichment of combustion air.
    C.
    using low c.v. fuels.
    D.
    maintaining proper draft in the furnace.

  15. Laboratory gas is obtained by the cracking of

  16. A.
    gasoline
    B.
    diesel
    C.
    fuel oil
    D.
    kerosene

  17. Bituminous coal

  18. A.
    ignites less easily than anthracite.
    B.
    is generally coking.
    C.
    burns with smoky yellow flame.
    D.
    both (b) and (c).

  19. Ratio of primary air to secondary air increases with increase in the rank of coal, because the

  20. A.
    high rank coals have higher amount of volatile matter.
    B.
    ratio of fixed carbon to volatile matter increases.
    C.
    oxygen content progressively decreases.
    D.
    calorific value of the coal increases.