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Chemical Engineering :: Furnace Technology

  1. The method of Lobo and Evans is concerned with the calculation of the

  2. A.
    heat absorption in radiant section of a furnace.
    B.
    heat transfer by forced convection in a reboiler.
    C.
    heat transfer in vacuum condensers.
    D.
    mass transfer co-efficient.

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  3. Reverberatory furnace is used for

  4. A.
    roasting/reduction of ores
    B.
    annealing steel coil
    C.
    heating air
    D.
    steel melting

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  5. Overall thermal efficiency of a lumpy coal fired suitably designed heating furnace, if operated & maintained properly may be about __________ percent.

  6. A.
    10-15
    B.
    25-30
    C.
    45-50
    D.
    65-70

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  7. In furnaces operating at very high temperature (say) 1250°C, e.g. soaking pit), the maximum heat transfer takes place by

  8. A.
    conduction
    B.
    convection
    C.
    radiation
    D.
    can not be predicted.

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  9. Which of the following is a directly fired intermittant furnace ?

  10. A.
    Walking beam reheating furnace
    B.
    Reverberatory furnace
    C.
    Tower furnace
    D.
    Tunnel kiln

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  11. Dampers are located

  12. A.
    before the I.D fan
    B.
    after the I.D. fan
    C.
    near the top of the chimney
    D.
    anywhere after the I.D. fan

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  13. Protective gas used in the annealing furnace for steel coil comprises of

  14. A.
    95% N2 + 5% H2
    B.
    5% H2 + 9% N2
    C.
    100% CO
    D.
    100 %H2

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  15. Out of the following fuels used in a furnace exhausting flue gas at a temperature of 600°C, the percentage stack loss will be maximum in case of complete combustion of

  16. A.
    furnace oil with air.
    B.
    furnace oil with oxygen.
    C.
    blast furnace gas with air.
    D.
    blast furnace gas with oxygen.

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  17. Scaling of furnace stock is reduced by __________ in flue gas.

  18. A.
    CO
    B.
    H2
    C.
    high CO/CO2
    D.
    all (a), (b) & (c)

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  19. __________ furnace is not an electric furnace.

  20. A.
    Arc
    B.
    Induction
    C.
    Pot
    D.
    Resistance.

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