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Chemical Engineering :: Furnace Technology

  1. Fuel economy in an industrial furnace operation can not be achieved by the use of

  2. A.
    stoichiometric combustion air.
    B.
    non-preheated combustion air.
    C.
    combustion air not enriched with oxygen.
    D.
    recupterators.

  3. The function of an economiser in a boiler is to preheat the

  4. A.
    feedwater
    B.
    combustion air
    C.
    pulverised coal
    D.
    furnace oil

  5. Which furnace employs an I.D. fan for the removal of flue gases from the furnace ?

  6. A.
    Coke oven.
    B.
    Blast furnace stoves.
    C.
    Beehive coke oven.
    D.
    High pressure boiler.

  7. Combustion of furnace oil in a furnace (soaking pit) with preheated combustion air at 400°C results in saving of about __________ percent furnace oil as compared to its combustion with atmospheric air, if the flue gas outlet temperature from the soaking pit is 1200°C.

  8. A.
    5
    B.
    60
    C.
    20
    D.
    40

  9. The advantages of firing pulverised coal in the furnace lies in the fact that, it

  10. A.
    permits the use of high ash content coal.
    B.
    permits the use of low fusion point ash coal.
    C.
    accelerates the burning rate and economises on fuel consumption.
    D.
    all (a), (b) and (c).

  11. Artificial draught produced by a fan in the furnace can be controlled by the

  12. A.
    speed of the fan.
    B.
    damper.
    C.
    variation in the pitch of fan blades.
    D.
    all (a), (b) and (c).

  13. Regenerators as compared to recuperators for the same duty

  14. A.
    store smaller quantity of waste heat
    B.
    are lighter & compact
    C.
    involve higher initial cost
    D.
    all (a), (b) & (c)

  15. Circulation of gases in furnace is caused by the

  16. A.
    change in volume during a change of temperature.
    B.
    difference in density between hot and cold gases.
    C.
    furnace pressure in conjunction with draft in flues.
    D.
    all (a), (b) and (c).

  17. Furnace aerodynamics is related to the __________ in the furnace.

  18. A.
    movement of gases
    B.
    measurement of flue gas volume
    C.
    temperature control
    D.
    pressure adjustment

  19. If the flame is produced under the hearth and then sweeps up into the heating chamber, this is called a/an __________ furnace.

  20. A.
    sidefired
    B.
    underfired
    C.
    covered
    D.
    recirculating