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Chemical Engineering :: Fuels and Combustion

  1. Coking time in a commercial high temperature coal carbonisation plant is about __________ hours.

  2. A.
    6
    B.
    18
    C.
    28
    D.
    36

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  3. Which of the following has the least calorific value (kcal/Nm3) ?

  4. A.
    Blast furnace gas
    B.
    Coke oven gas
    C.
    Sewage gas
    D.
    Natural gas

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  5. Commercial production of petrol from coal (as practised in a factory at Sasol in South Africa) is done by the __________ of coal.

  6. A.
    hydrogenation
    B.
    gasification
    C.
    carbonisation
    D.
    none of these

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  7. The combustion reaction, C + O2 = CO2, is

  8. A.
    exothermic
    B.
    endothermic
    C.
    autocatalytic
    D.
    none of these

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  9. For maximum discharge through a chimney, its height should be

  10. A.
    200 meters.
    B.
    infinitely long.
    C.
    more than 105.7 metres.
    D.
    equal to the height of the hot gas column producing draught.

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  11. Which of the following is not applicable to fluidised bed combustion of coal ?

  12. A.
    It can not burn low grade coal.
    B.
    It achieves higher fuel combustion efficiency.
    C.
    Less heat transfer surface area is required in boilers.
    D.
    None of these.

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  13. Coal containing large quantity of __________ are difficult to wash.

  14. A.
    ash
    B.
    inherent mineral matter
    C.
    free impurities
    D.
    volatile matter

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  15. Which of the following is not a micro component present in coal ?

  16. A.
    Micrinite
    B.
    Clarain
    C.
    Fusinite
    D.
    Liptinite

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  17. Calorific values of both the solid as well as the liquid fuels can be determined by __________ calorimeter.

  18. A.
    bomb
    B.
    Boy's
    C.
    Junkar's
    D.
    none of these

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  19. A coal containing high amount of volatile matter will have

  20. A.
    low ignition temperature
    B.
    very little ash content
    C.
    high fusion point of its ash
    D.
    low adiabatic flame temperature

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