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Chemical Engineering :: Furnace Technology

  1. Which is a regenerative furnace ?

  2. A.
    Coke oven heating chamber.
    B.
    Open hearth furnace.
    C.
    Both (a) and (b).
    D.
    Neither (a) nor (b).

  3. Which of the following accentuates clinker-ing troubles on furnace grate burning coal?

  4. A.
    Low reactivity of carbonised residue containing high proportion of iron & sulphur.
    B.
    Low forced draft & fuel bed temperature.
    C.
    Thick firebed and preheated primary air.
    D.
    All (a), (b) and (c).

  5. The electric furnace in which heat is produced by a combination of induced current and skin effect is called __________ furnace.

  6. A.
    arc
    B.
    resistance
    C.
    low frequency induction
    D.
    high frequency induction

  7. Ingress of cold air in the furnaces through cracks, charging doors, openings etc.

  8. A.
    reduces the flue gas temperature and makes the furnace atmosphere oxidising.
    B.
    increases the load on the induced draft fan.
    C.
    reduces the furnace draught.
    D.
    all (a), (b) and (c)

  9. Use of pulverised coal in boilers provides

  10. A.
    higher calorific value
    B.
    better combustion
    C.
    smokeless burning
    D.
    less erosion on furnace wall.

  11. In which of the waste heat recovery equipment, the flow of flue gas and air is alternately reversed after a fixed interval of time ?

  12. A.
    Recuperator
    B.
    Regenerator
    C.
    Waste heat boiler
    D.
    None of these

  13. An electric furnace producing heat by means of an electric arc struck between each of three electrodes and the charge is called __________ furnace.

  14. A.
    resistance
    B.
    arc
    C.
    low frequency induction
    D.
    none of these

  15. Turndown ratio of a burner gives an idea of the __________ in the furnace.

  16. A.
    range of fuel firing rates
    B.
    volume of the combustion chamber
    C.
    maximum heat input rate only
    D.
    minimum heat input rate only

  17. In low or standard frequency induction furnace, heat is produced by the

  18. A.
    combination of induced current and skin effect.
    B.
    induction and resistance.
    C.
    current flow through a heating element.
    D.
    none of these.

  19. Which furnace employs natural draft ?

  20. A.
    Coke oven
    B.
    Boiler
    C.
    Rotary kilns
    D.
    L.D. converter