Furnace Technology

131.Which of the following is a heat treatment furnace?

1. Muffle furnace
2. Annealing furnace
3. Reheating furnace
4. Rotary kiln

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132.Which of the following is a periodic furnace?

1. Tunnel kiln
2. Rotary kiln
3. Soaking pit
4. Reheating furnace

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133.Which of the following is not a continuous waste heat recovery equipment from the flue gases going out of furnace?

1. Economiser
2. Regenerator
3. Ceramic recuperator
4. Waste heat boiler

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134.Which of the following is not a directly fired furnace?

1. By-product coke oven
2. Calcination kiln
3. Sintering furnace
4. Open hearth furnace

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135.Which of the following is not a recuperative furnace?

1. Soaking pit
2. Reheating furnace
3. Steam boiler
4. Coke oven

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136.Which of the following is not an additive for flue gases from furnace to reduce its dewpoint?

1. Ammonia
2. Fine dolomite
3. Alkaline powders
4. None of these

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137.Which of the following is the most important deterrents to an extended use of pulverised coal in boiler firing?

1. Ash disposal problem
2. Excessive fly ash discharge from the stack
3. Higher power consumption in its transportation
4. Erosion of induced draft fan blades

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138.Which of the following is the most suitable for preheating combustion air above 650°C?

1. Regenerator
2. Metallic recuperator
3. Ceramic recuperator
4. None of these

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139.Which of the following variables affects the furnace capacity?

1. Temperature of flue gas
2. Thermal conductivity of stock
3. Thickness of heating stock
4. All (A), (B) and (C)

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140.Which of the following variables does not affect the furnace capacity?

1. Size of the furnace
2. Gas velocity in furnace
3. Ratio of wall surface to surface of stock
4. None of these

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