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Chemical Engineering :: Fuels and Combustion

  1. Traces of tar fog present in the coke oven gas is removed by

  2. A.
    cyclone separator.
    B.
    wet packed scrubber.
    C.
    electrostatic precipitator.
    D.
    washing with monoethanolamine.

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  3. Ionisation potential applied across the electrodes of electrostatic tar precipitator is around

  4. A.
    230 V AC
    B.
    60 KV AC
    C.
    230 V DC
    D.
    60 KV DC

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  5. Pitch creosote mixture (PCM) as compared to furnace oil is a better fuel, because its

  6. A.
    emissivity factor is higher.
    B.
    sulphur content is lower.
    C.
    flue gas has lower dew point thereby facilitating more waste heat recovery.
    D.
    all (a), (b) and (c).

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  7. Optimum preheating temperature for pitch creosote mixture (PCM) which is also termed as C.T.F-200, before atomisation through burners is

  8. A.
    200 °F
    B.
    200 °C
    C.
    200 °K
    D.
    200 °R

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  9. Benzol is used

  10. A.
    as a motor fuel blend.
    B.
    for producing benzene, tolune & xylene by its distillation.
    C.
    both (a) & (b).
    D.
    neither (a) nor (b).

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  11. A travelling grate stoker is meant for the efficient burning of __________ coal.

  12. A.
    caking
    B.
    pulverised
    C.
    non-caking
    D.
    high ash

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  13. Pick out the wrong statement.

  14. A.
    Angle of repose of coal increases with its increasing size.
    B.
    Specific gravity of coal increases with its increasing maturity.
    C.
    Refractive index and reflectance of coal increases with the increasing rank of coal.
    D.
    Specific heat of coal decreases with increases in the volatile matter and decrease in the C/H ratio of coal.

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  15. Percentage of carbon monoxide in blast furnace gas may be around

  16. A.
    8
    B.
    14
    C.
    22
    D.
    52

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  17. The main drawback of supplying more excess air in the combustion of fuel is the

  18. A.
    excessive power requirement of air blower.
    B.
    enhanced sensible heat loss in the flue gas.
    C.
    intermittant and uncontrolled combustion of the fuel.
    D.
    high exit flue gas temperature from the furnace.

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  19. Width of the coke oven towards coke side is slightly more than that on pusher side to

  20. A.
    facilitate easy discharging of coke as it swells during carbonisation.
    B.
    facilitate uniform heating of the oven.
    C.
    increase the output of the coke.
    D.
    none of these.

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