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Chemical Engineering :: Fuels and Combustion

  1. Adiabatic flame temperature of a fuel is dependent on the initial temperature of

  2. A.
    fuel
    B.
    air
    C.
    both (a) & (b)
    D.
    neither (a) nor (b)

  3. Which of the following gaseous fuels has the lowest calorific value ?

  4. A.
    Gobar gas
    B.
    Refinery gas
    C.
    Converter gas
    D.
    Blast furnace gas

  5. Which of the following is not a by-product recovered in a high temperature coal carbonisation plant ?

  6. A.
    Benzol
    B.
    Pitch-cresosote mixture (PCM)
    C.
    Napthalene
    D.
    Ethylene

  7. Pensky-Marten apparatus is used for those oils, whose flash points are __________ °F.

  8. A.
    <120
    B.
    >120
    C.
    <90
    D.
    90-110

  9. In high temperature carbonisation of coal compared to low temperature carbonisation

  10. A.
    yield of ammonia is less.
    B.
    aromatic content of tar is low.
    C.
    H2 content in the coke oven gas is more.
    D.
    calorific value of the coke oven gas is lower.

  11. When incomplete combustion loss is high, the flue gas analysis shows large amount of

  12. A.
    CO2
    B.
    CO
    C.
    O2
    D.
    C

  13. The gas which contributes maximum to the heating value of natural gas is

  14. A.
    CO
    B.
    CO2
    C.
    H2
    D.
    CH4

  15. The temperature at which plastic layer formation takes place during carbonisation of coal varies from __________ °C.

  16. A.
    100 to 150
    B.
    350 to 450
    C.
    550 to 650
    D.
    700 to 850

  17. Yield of coke oven gas in low temperature carbonisation of coal is about __________ Nm3 /ton of dry coal.

  18. A.
    60
    B.
    160
    C.
    500
    D.
    750

  19. Temperature of preheated air used for the transportation of pulverised coal through pipes to the burner of a boiler furnace is restricted to a maximum limit of about 300° C to avoid the

  20. A.
    requirement of large volume combustion chamber.
    B.
    risk of explosion.
    C.
    chances of clinker formation.
    D.
    incomplete combustion of coal.