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Chemical Engineering :: Fuels and Combustion

  1. A sample of natural gas containing 80% methane (CH4) and rest nitrogen (N2) is burnt with 20% excess air. With 80% of the combustibles producing CO2 and the reminder going to CO, the Orsat analysis in volume percent is

  2. A.
    CO2 : 6.26, CO : 1.56, O2 : 3.91, H2O :15.66, N2 : 72.60
    B.
    CO2 : 7.42, CO : 1.86, O2 : 4.64, N2:86.02
    C.
    CO2 : 6.39, CO : 1.60, O2 : 3.99, H2O:25.96, N2:72.06
    D.
    CO2 : 7.60, CO : 1.90, O2 : 4.75, N2 : 85.74

  3. Which of the following would require maximum amount of % excess air for complete combustion ?

  4. A.
    Coke oven gas
    B.
    Furnace oil
    C.
    Pulverised coal
    D.
    Lump coal (fixed on chain grate).

  5. During combustion of a gaseous fuel, the presence of a non-luminous flame is an indication of the

  6. A.
    incomplete combustion.
    B.
    complete combustion.
    C.
    high oxygen in flue gas.
    D.
    none of these.

  7. Flue gas obtained on complete combustion of pure acetylene (a hydrocarbon fuel) will contain

  8. A.
    CO
    B.
    CO2
    C.
    H2O
    D.
    both(b) & (c)

  9. Low temperature oxidation of coal is accelerated by the

  10. A.
    storage in large heaps.
    B.
    storage in compressed piles.
    C.
    absence of porous or friable particles.
    D.
    all (a), (b) and (c).

  11. With increase in calorific value of fuels, their adiabatic flame temperatures

  12. A.
    increase
    B.
    decrease
    C.
    remain unchanged
    D.
    may increase or decrease ; depends on the quantity of products of combustion

  13. Coal tar fuel - 200 (CTF 200) is a mixture of

  14. A.
    pitch and creosote oil.
    B.
    light oil and pitch.
    C.
    anthracene and crecosote oil.
    D.
    solar oil and pitch.

  15. Calorific value of coke even gas produced by low temperature carbonisation of coal is about __________ Kcal/Nm3.

  16. A.
    4000
    B.
    2500
    C.
    6500
    D.
    10000

  17. High pressure coal gasification is employed in __________ process.

  18. A.
    Lurgi
    B.
    Kopper-Totzek
    C.
    Winkler
    D.
    none of these

  19. Flue gas from the heating chamber of byproduct coke ovens is removed by

  20. A.
    forced draft fan
    B.
    induced draft fan
    C.
    steam ejector
    D.
    natural draft