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Chemical Engineering :: Fuels and Combustion

  1. Which of the following is not a 'manufactured' fuel ?

  2. A.
    LPG
    B.
    Coal briquettes
    C.
    Tar
    D.
    Colloidal fuels

  3. Use of excess of combustion air in the combustion of fuels results in

  4. A.
    heat losses.
    B.
    long flame.
    C.
    condensation of water vapour from the fuel gas.
    D.
    none of these.

  5. Which of the following is the most important deterrents to an extended use of pulverised coal in boiler firing ?

  6. A.
    Ash disposal problem.
    B.
    Excessive fly-ash discharge from the stack.
    C.
    High power consumption in its transportation.
    D.
    Erosion of induced draft fan blades.

  7. Calorific value of both the solid & liquid fuels can be determined by using __________ calorimeter.

  8. A.
    Junker's
    B.
    Bomb
    C.
    Boy's
    D.
    none of these

  9. Coke oven gas produced by high temperature carbonisation of coal (as compared to that produced by low temperature carbonisation), has

  10. A.
    higher calorific value.
    B.
    lower hydrogen content.
    C.
    both (a) and (b).
    D.
    neither (a) nor (b).

  11. Which of the following fertilisers is produced in the by-products recovery (from coke oven gas) plant attached to an integrated steel plant ?

  12. A.
    Ammonium sulphate
    B.
    Ammonium nitrate
    C.
    Ammonium phosphate
    D.
    None of these

  13. Percentage of hydrogen in coke oven gas may be around

  14. A.
    10
    B.
    25
    C.
    45
    D.
    60

  15. Function of secondary air in pulverised coal firing is to

  16. A.
    transport the coal to the burner.
    B.
    dry the coal.
    C.
    ensure efficient burning of coal around the burner.
    D.
    reduce primary air requirement.

  17. Calorific value of dry wood may be around __________ Kcal/kg.

  18. A.
    5
    B.
    50
    C.
    500
    D.
    5000

  19. Calorific value of gobar gas (containing CH4 = 60% , H2 = 10% ; CO2 = 30%) may be about __________ Kcal/Nm3.

  20. A.
    1800
    B.
    3200
    C.
    5400
    D.
    10200