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Chemical Engineering :: Fuels and Combustion

  1. In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of

  2. A.
    transportation of coal.
    B.
    drying of coal.
    C.
    combustion of coal by supplying it around the burner.
    D.
    preheating the primary air.

  3. Largest constituent of coke oven gas is

  4. A.
    N2
    B.
    H2
    C.
    CH4
    D.
    CO2

  5. Fussain

  6. A.
    is friable, charcoal like substance.
    B.
    has highest fixed carbon and lowest volatile matter content of all the four banded components of coal.
    C.
    is non-coking, but when blended with highly coking coal, controls its swelling and produces high strength coke on carbonisation.
    D.
    all (a), (b) and (c).

  7. Producer gas comprises mainly of

  8. A.
    CO & N2
    B.
    CO & H2
    C.
    CO2 & N2
    D.
    CO2 & H2

  9. In high temperature carbonisation (as compared to low temperature carbonisation) of coal, the

  10. A.
    gas yield is less.
    B.
    tar yield is more.
    C.
    ignition temperature of coke produced is less.
    D.
    aromatic content of tar produced is more.

  11. Calorific value of pitch creosote mixture (PCM) i.e., C.T.F.-200 is about

  12. A.
    8800 kcal/m3
    B.
    8800 kcal/kg
    C.
    same as that of coal middling
    D.
    25000 kcal/kg

  13. Bomb calorimeter is used to determine the (where, GCV - Gross Calorific Value. NCV - Net Calorific Value.)

  14. A.
    GCV at constant pressure.
    B.
    GCV at constant volume.
    C.
    NCV at constant pressure.
    D.
    NCV at constant volume.

  15. Which of the following oil gasification processes is non-catalytic ?

  16. A.
    Semet-Solvay process
    B.
    Segas process
    C.
    Onia-Gegi process
    D.
    Steam reforming of naphtha

  17. Dust content in raw blast furnace gas is about __________ gm/Nm3 , hence it is cleaned to the dust level of about < 10 mg /Nm3 before use.

  18. A.
    15-30
    B.
    1-2
    C.
    70-100
    D.
    150-200

  19. Kopper-Totzek coal gasifier

  20. A.
    can give ammonia synthesis gas (H2 + N2).
    B.
    is a moving bed reactor.
    C.
    cannot use coking coal.
    D.
    operate at very high pressure.