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Chemical Engineering :: Fuels and Combustion

  1. Coke compared to the coal from which it has been made, contains

  2. A.
    less volatile matter.
    B.
    more carbon.
    C.
    greater percentage of ash.
    D.
    all (a), (b) and (c).

  3. A gaseous fuel in order to develop luminousity on burning, must contain

  4. A.
    carbon monoxide
    B.
    hydrocarbons
    C.
    hydrogen
    D.
    oxygen

  5. Nitrogen present in the flue gas is determined in the orsat apparatus by absorbing it in

  6. A.
    KOH
    B.
    ammoniacal cuprous chloride
    C.
    pyrogallol solution
    D.
    none of these

  7. The lowest temperature, at which a solid fuel produces enough vapors to support continuous combustion, is called

  8. A.
    fire point
    B.
    smoke point
    C.
    burning temperature
    D.
    kindling temperature

  9. A coal having high volatile matter content will

  10. A.
    give less yield of tar and gas on carbonisation.
    B.
    burn with a small non-smoky flame.
    C.
    have a very high calorific value.
    D.
    none of these.

  11. Most of the coking coals are

  12. A.
    anthracite
    B.
    bituminous
    C.
    lignite
    D.
    none of these

  13. Gobar gas constitutes mainly of

  14. A.
    CH4 & CO2
    B.
    CO & CO2
    C.
    CH4 & N2
    D.
    CO & N2

  15. High ash containing coke

  16. A.
    produces more slag when used in the blast furnace.
    B.
    has poor strength and abrasion resistance.
    C.
    is desirable in producer gas manufacture.
    D.
    none of these.

  17. Stoichiometric combustion of 12 kg of carbon requires __________ of oxygen.

  18. A.
    1kg mole
    B.
    22.4 Nm3
    C.
    32 kg
    D.
    all (a), (b) and (c)

  19. Coal is pulverised before burning in large capacity boiler furnaces mainly to

  20. A.
    ensure its complete combustion.
    B.
    facilitate easy ash removal.
    C.
    enhance its calorific value.
    D.
    provide trouble free operation.