Furnace Technology MCQs with answers Page - 14

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Admin • 833K Points
Coach

Q. Which of the following accentuates clinker-ing troubles on furnace grate burning coal?

  • (A) Low reactivity of carbonised residue containing high proportion of iron & sulphur
  • (B) Low forced draft & fuel bed temperature
  • (C) Thick firebed and preheated primary air
  • (D) All of the above

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Q. Ostwald charts are meant for

  • (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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Q. Which one is not an induced draught furnace?

  • (A) Blast furnace stove
  • (B) Sintering furnace
  • (C) High pressure boiler
  • (D) None of these

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Q. In which of the following furnaces, the gases are sucked through the stock bed from below?

  • (A) Soaking pit
  • (B) Sintering machine
  • (C) Beehive oven
  • (D) None of these

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Q. A refractory wall separating the stock and the source of heat is provided in a

  • (A) Updraft kiln
  • (B) Muffle furnace
  • (C) Continuous furnace
  • (D) None of these

A

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Q. Pick out the wrong statement.

  • (A) Addition of methane to the furnace atmosphere reduces decarburising by hydrogen
  • (B) Nitrogen in presence of steam decar-burises high carbon steel, whereas hydrocarbon gases carburise the surface of steel at annealing temperatures
  • (C) Active nitrogen (formed by cracking ammonia at the metal surface) cause nitride formation with increase in surface hardness
  • (D) None of these

A

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Q. While the fuel fired furnace can be used upto a maximum temperature of about 1700°C, the electric furnace can be used upto a temperature of about __________ °C.

  • (A) 2000
  • (B) 3000
  • (C) 4500
  • (D) 6000

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Q. In a furnace, the heat taken by the charge/stock and the heat lost to the furnace structure & flue gases depends on the

  • (A) Rate of firing and emissivity of flame
  • (B) Thermal conductivity of the charge & structural materials of furnace
  • (C) Nature of process ; whether batch, continuous or intermittant
  • (D) All of the above

A

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Q. Very high pressure boilers are usually __________ boilers.

  • (A) Fire tube
  • (B) Waste heat
  • (C) Water tube
  • (D) Natural circulation

A

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Q. Recuperator is

  • (A) Not used for fuel gas preheating
  • (B) An intermittant waste heat recovery equipment
  • (C) A continuous waste heat recovery equipment
  • (D) Heavier than regenerator meant for the same duty

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