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  • Question
  • __________ atmosphere is maintained inside an iron blast furnace.


  • Options
  • A. Oxidising
  • B. Reducing
  • C. Inert
  • D. Decarburising

  • Correct Answer
  • Reducing 


  • Furnace Technology problems


    Search Results


    • 1. In a muffle furnace, the muffle

    • Options
    • A. retards the heat transfer.
    • B. assists in temperature equalisation in the charge.
    • C. permits the use of controlled atmosphere for the protection of stock.
    • D. all (a), (b) and (c).
    • Discuss
    • 2. An example of shaft furnace is the

    • Options
    • A. L.D. converter
    • B. glass melting tank
    • C. blast furnace
    • D. soaking pit
    • Discuss
    • 3. In reverberatory furnace, charge is heated mainly by

    • Options
    • A. conduction.
    • B. natural convection.
    • C. radiation of heat from the roof of the combustion chamber.
    • D. none of these.
    • Discuss
    • 4. Fuel used in B.F. stove is

    • Options
    • A. pulverised coal
    • B. furnace oil
    • C. blast furnace gas/mixed gas
    • D. coke oven gas
    • Discuss
    • 5. In order to maintain a reducing atmosphere in a furnace, it should have

    • Options
    • A. no O2 in flue gas
    • B. CO in flue gas
    • C. high excess air
    • D. none of these
    • Discuss
    • 6. Tunnel kilns are usually used for

    • Options
    • A. roasting of pyrites.
    • B. drying/tempering of refractories.
    • C. reheating of slabs.
    • D. melting of glass.
    • Discuss
    • 7. Ceramic recuperators (made of SiC) is economical, only when used for preheating combustion air above __________ °C.

    • Options
    • A. 250
    • B. 650
    • C. 850
    • D. 1000
    • Discuss
    • 8. In a furnace employing forced draught as compared to induced draught,

    • Options
    • A. air is sucked in, so air leaks are more and hence the furnace efficiency is reduced.
    • B. the fan operates hot and hence blades are liable to corrosion and erosion.
    • C. positive pressure exists in the furnace.
    • D. none of these
    • Discuss
    • 9. In producer gas making furnace, steam is added along with air to mainly control the

    • Options
    • A. fusion of coal ash & clinker formation.
    • B. C. V. of producer gas.
    • C. temperature of producer gas.
    • D. tar content in producer gas.
    • Discuss
    • 10. Which of the following is not an additive for flue gases from furnace to reduce its dew-point?

    • Options
    • A. Ammonia
    • B. Fine dolomite
    • C. Alkaline powders
    • D. None of these
    • Discuss


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