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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. Gray King Assay and Swelling Index of a coal is a measure of its

    2. A.
    swelling characteristics.
    B.
    abradability.
    C.
    agglutinating properties.
    D.
    resistance to impact breakage.

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  2. Explosion limit of blast furnace gas is 37 to 71% gas in gas-air mixture. It means that the blast furnace gas will explode when burnt in a confined space, if its concentration in the gas-air mixture is __________ percent.

    3. A.
    < 37%
    B.
    >71%
    C.
    in between 37 & 71%
    D.
    none of these

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  3. Prime coking coal is always blended with medium or non- coking coal before ear-bonisation

    4. A.
    to check against its excessive swelling during heating, which may exert high pressure and damage coke oven walls.
    B.
    because, it alone produces unreactive coke.
    C.
    both (a) and (b).
    D.
    neither (a) nor (b).

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  4. Actual flame temperature is always lower than the adiabatic flame temperature, because there is

    5. A.
    no possibility of obtaining complete combustion at high temperature.
    B.
    always loss of heat from the flame.
    C.
    both (a) and (b).
    D.
    neither (a) nor (b).

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  5. Coke oven gas consists mainly of

    6. A.
    H2, & CH4
    B.
    CO, & CO2
    C.
    H2, & CO
    D.
    CH4, & CO

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  6. Fuel gases containing hydrocarbons (ie.g. coke oven gas) are not preheated before burning, mainly because

    7. A.
    the hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot.
    B.
    it reduces its calorific value tremendously.
    C.
    it reduces its flame temperature tremendously.
    D.
    there are chances of explosion during preheating.

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  7. Which of the following is the most reactive (as regards the formation of CO + H2 from C + H2O) ?

    8. A.
    Blast furnace coke
    B.
    Low temperature coke
    C.
    Anthracite coal
    D.
    Sub-bituminous coal

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  8. Calorific value of coal middling generated in coal washeries during washing of coal may be around __________ Kcal/kg.

    9. A.
    1000
    B.
    4000
    C.
    6000
    D.
    8000

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  9. Flue gas discharge velocity through chimney of a big thermal power plant may be around __________ m/sec.

    10. A.
    0.5
    B.
    10
    C.
    50
    D.
    500

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  10. Which of the following is used for making the explosive 'TNT' ?

    11. A.
    Benzol
    B.
    Toluene
    C.
    Pyridine
    D.
    Cerosote

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