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  • Question
  • 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

  • Correct Answer
  • 650 


  • Furnace Technology problems


    Search Results


    • 1. 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
    • 2. __________ atmosphere is maintained inside an iron blast furnace.

    • Options
    • A. Oxidising
    • B. Reducing
    • C. Inert
    • D. Decarburising
    • Discuss
    • 3. 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
    • 4. An example of shaft furnace is the

    • Options
    • A. L.D. converter
    • B. glass melting tank
    • C. blast furnace
    • D. soaking pit
    • Discuss
    • 5. 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
    • 6. 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
    • 7. 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
    • 8. 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
    • 9. Thickness of stock does not affect the fuel economy of furnaces, if the material to be heated is of

    • Options
    • A. low emissivity
    • B. high thermal conductivity
    • C. both (a) and (b)
    • D. neither (a) nor (b)
    • Discuss
    • 10. Large tonnage of refractory bricks are dried in a

    • Options
    • A. shaft furnace
    • B. rotary hearth furnace
    • C. tunnel kiln
    • D. muffle furnace
    • Discuss


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