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Chemical Engineering :: Furnace Technology

  1. Fuel used in B.F. stove is

  2. A.
    pulverised coal
    B.
    furnace oil
    C.
    blast furnace gas/mixed gas
    D.
    coke oven gas

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  3. Tunnel kilns are usually used for

  4. A.
    roasting of pyrites.
    B.
    drying/tempering of refractories.
    C.
    reheating of slabs.
    D.
    melting of glass.

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  5. The thermal efficiency of a steel slab reheating furnace (walking beam type) may be about __________ percent.

  6. A.
    15
    B.
    40
    C.
    70
    D.
    85

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  7. Higher furnace temperature can not be achieved by use of a lean fuel gas in the furnace by

  8. A.
    increasing the draft in the furnace.
    B.
    preheating the fuel gas.
    C.
    oxygen enrichment of combustion air.
    D.
    preheating the combustion air.

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  9. Temperature of a furnace fired with low calorific value fuel gas (i.e. lean gas) can be increased by

  10. A.
    preheating the combustion air.
    B.
    oxygen enrichment of combustion air.
    C.
    preheating the fuel gas.
    D.
    all (a), (b) & (c).

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  11. Ceramic coating material for furnace refractory, which increases its emissivity and thus the radiation heat transfer rate in the furnace, comprises of

  12. A.
    graphite powder
    B.
    thoria
    C.
    zircon powder
    D.
    beryllium

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  13. In reverberatory furnace, charge is heated mainly by

  14. A.
    conduction.
    B.
    natural convection.
    C.
    radiation of heat from the roof of the combustion chamber.
    D.
    none of these.

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  15. An example of a periodic furnace is the

  16. A.
    blast furnace stoves
    B.
    blast furnace
    C.
    coke oven heating chamber
    D.
    rotary kilns

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  17. Ostwald charts are meant for

  18. A.
    computing the excess/deficiency of combustion air.
    B.
    calculation of flue gas temperature.
    C.
    computation of flue gas analysis.
    D.
    none of these.

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  19. Which of the following is a natural draft furnace ?

  20. A.
    Blast furnace stoves
    B.
    Power plant boilers
    C.
    Sintering furnace
    D.
    None of these

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