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Furnace Technology problems

  • 1. Coke ovens in steel plant are heated by

  • Options
  • A. electricity
  • B. blast furnace gas/mixed gas
  • C. coke oven gas
  • D. both (b) and (c)
    • Discuss
  • 2. Higher furnace temperature can not be achieved by use of a lean fuel gas in the furnace by

  • Options
  • A. increasing the draft in the furnace.
  • B. preheating the fuel gas.
  • C. oxygen enrichment of combustion air.
  • D. preheating the combustion air.
    • Discuss
  • 3. An example of a periodic furnace is the

  • Options
  • A. blast furnace stoves
  • B. blast furnace
  • C. coke oven heating chamber
  • D. rotary kilns
    • Discuss
  • 4. Calcination of limestone to produce lime is done in a __________ kiln.

  • Options
  • A. tunnel
  • B. rotary
  • C. vertical shaft
  • D. both (b) and (c)
    • Discuss
  • 5. Acid dew point temperature (ADT) of a flue gas produced by the combustion of a fuel containing 1% sulphur may be about __________ °C.

  • Options
  • A. 80
  • B. 130
  • C. 180
  • D. 250
    • Discuss
  • 6. Ostwald charts are meant for

  • Options
  • A. computing the excess/deficiency of combustion air.
  • B. calculation of flue gas temperature.
  • C. computation of flue gas analysis.
  • D. none of these.
    • Discuss
  • 7. The thermal efficiency of an air/fuel gas preheating recuperator may be as high as __________ percent.

  • Options
  • A. 50
  • B. 65
  • C. 85
  • D. 99
    • Discuss
  • 8. 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
  • 9. 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
  • 10. 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

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