Furnace Technology

121.Which is a continuous furnace?

1. Coke ovens
2. Annealing furnace
3. Glass tank furnace
4. None of these

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122.Which is a regenerative furnace?

1. Coke oven heating chamber
2. Open hearth furnace
3. Both (A) and (B)
4. Neither (A) nor (B)

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123.Which is not a hearth furnace?

1. Glass tank furnace
2. Open hearth furnace
3. Cupola
4. Reheating furnace

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124.Which is not accomplished in an underfired furnace?

1. Increase in heating capacity/m² of floor space
2. Elimination of cold spot at the bottom of the charge
3. Reduction in the temperature of furnace gases
4. Protection of the periphery of the charge from excessive radiation

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125.Which is the most thermally efficient furnace?

1. Reheating furnace
2. Reverberatory furnace
3. Rotary kilns
4. Boiler furnace

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126.Which of the following accentuates clinkering troubles on furnace grate burning coal?

1. Low reactivity of carbonised residue containing high proportion of iron & sulphur
2. Low forced draft & fuel bed temperature
3. Thick firebed and preheated primary air
4. All (A), (B) and (C)

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127.Which of the following advantages is not associated with the use of preheated air for combustion of a fuel in the furnace?

1. Increase in calorific value of the fuel
2. Increase in flame temperature
3. Reduction in scale losses
4. Saving in fuel consumption

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128.Which of the following furnaces will have maximum thermal efficiency?

1. Soaking pits
2. Walking beam reheating furnace
3. Boiler furnace
4. Rotary kilns

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129.Which of the following is a batch furnace?

1. Cupola
2. Reheating furnace
3. Glass tank furnace
4. None of these

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130.Which of the following is a directly fired intermittent furnace?

1. Walking beam reheating furnace
2. Reverberatory furnace
3. Tower furnace
4. Tunnel kiln

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