Furnace Technology

91.Soaking pits are meant for heating steel

1. Ingots
2. Coils
3. Sheets
4. Slabs

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92.Specific heating capacity of a furnace is expressed as

1. Weight heated/hr
2. Weight heated/furnace volume
3. Weight heated/hr/furnace volume
4. None of these

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93.Temperature of a furnace fired with low calorific value fuel gas (i.e. lean gas) can be increased by

1. Preheating the combustion air
2. Oxygen enrichment of combustion air
3. Preheating the fuel gas
4. All (A), (B) & (C)

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94.The advantages of firing pulverised coal in the furnace lies in the fact that, it

1. Permits the use of high ash content coal
2. Permits the use of low fusion point ash coal
3. Accelerates the burning rate and economises on fuel consumption
4. All (A), (B) and (C)

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95.The amount of combustible escaping unconsumed from the furnace, depends upon the

1. Air supplied and furnace temperature
2. Burner design (thoroughness of mixing versus stratification)
3. Air preheat and the flow of gases in the furnace (mixing by induction, by acceleration or by change of direction)
4. All (A), (B) and (C)

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96.The electric furnace in which heat is produced by a combination of induced current and skin effect is called _________ furnace.

1. Arc
2. Resistance
3. Low frequency induction
4. High frequency induction

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97.The function of an economiser in a boiler is to preheat the

1. Feedwater
2. Combustion air
3. Pulverised coal
4. Furnace oil

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98.The heat recoverable from flue gases of furnaces depends on the

1. Thermal efficiency of furnace
2. Quantity of flue gases
3. Flue gas temperature drop through the furnace
4. All (A), (B) and (C)

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99.The heating capacity of muffle furnace depends on the

1. Surface area & emissivity of the stock
2. Properties of the muffle wall (temperature, area, and emissivity)
3. Both (A) & (B)
4. Neither (A) nor (B)

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100.The main function of a muffle in the muffle furnace is to

1. Protect the charge from the effects of the products of combustion
2. Smooth out temperature inequalities on the combustion side of the muffle wall
3. Both (A) & (B)
4. Neither (A) nor (B)

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