Furnace Technology

81.Regenerators are normally provided in the

  1. Glass melting furnace
  2. Open hearth furnace
  3. By product coke ovens
  4. All (A), (B) and (C)

Correct answer: (D)
All (A), (B) and (C)

82.Regenerators are used for waste heat recovery in

  1. By-product coke ovens
  2. Beehive coke oven
  3. Blast furnace stoves
  4. Soaking pits

Correct answer: (A)
By-product coke ovens

83.Regenerators as compared to recuperators for the same duty

  1. Store smaller quantity of waste heat
  2. Are lighter & compact
  3. Involve higher initial cost
  4. All (A), (B) & (C)

Correct answer: (C)
Involve higher initial cost

84.Regenerators compared to the recuperators for the same duty

  1. Occupy more space
  2. Are less costly
  3. Are of smaller size
  4. All (A), (B) and (C)

Correct answer: (A)
Occupy more space

85.Reheating furnace (pusher type) is used for heating

  1. Ingots
  2. Slabs
  3. Steel coils
  4. Steel sheets

Correct answer: (B)
Slabs

86.Reverberatory furnace is used for

  1. Roasting/reduction of ores
  2. Annealing steel coil
  3. Heating air
  4. Steel melting

Correct answer: (A)
Roasting/reduction of ores

87.Rotary kilns are used in the

  1. Calcination of limestone & dolomite
  2. Cement manufacture
  3. Both (A) and (B)
  4. Neither (A) nor (B)

Correct answer: (C)
Both (A) and (B)

88.Scaling of furnace stock is reduced by _________ in flue gas.

  1. CO
  2. H2
  3. High CO/CO2
  4. All (A), (B) & (C)

Correct answer: (D)
All (A), (B) & (C)

89.Shaft furnaces are used for

  1. Smelting
  2. Calcining
  3. Roasting
  4. All (A), (B) and (C)

Correct answer: (D)
All (A), (B) and (C)

90.Size of the combustion chamber of a furnace depends upon the

  1. Heat release rate of the fuel
  2. Preheat temperature of fuel & air
  3. Method of mixing the fuel & air
  4. All (A), (B) and (C)

Correct answer: (D)
All (A), (B) and (C)

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