Furnace Technology

31.Forced recirculation of furnace gases is practised

1. To increase heat transfer by convection
2. To ensure uniform temperature
3. In furnaces, operating below 750°C
4. All (A), (B) and (C)

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32.Fuel economy in an industrial furnace operation cannot be achieved by the use of

1. Stoichiometric combustion air
2. Non-preheated combustion air
3. Combustion air not enriched with oxygen
4. Recuperators

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33.Fuel economy in furnaces can be achieved by

1. Using oxygen enriched combustion air
2. Preheating the combustion air
3. Reducing the heat loss through furnace openings & doors
4. All (A), (B) and (C)

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34.Fuel used in B.F. stove is

1. Pulverised coal
2. Furnace oil
3. Blast furnace gas/mixed gas
4. Coke oven gas

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35.Furnace aerodynamics is related to the _________ in the furnace.

1. Movement of gases
2. Measurement of flue gas volume
3. Temperature control
4. Pressure adjustment

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36.Furnace pressure is normally controlled by regulating the

1. Air pressure
2. Fuel gas pressure
3. Speed of I.D. fan
4. Damper

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37.Hearth furnaces are not used for

1. Roasting
2. Melting
3. Reheating
4. None of these

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38.Heat balance of furnace provides means of determining the

1. Thermal efficiency of the process
2. Sources of heat losses
3. Scope of reduction of heat losses
4. All (A), (B) and (C)

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39.Heat transfer rate to the charge/stock in a furnace does not depend upon the

1. Type of fuels viz. solid, liquid or gaseous
2. Flue gas temperature
3. Emissivity of refractory walls
4. Initial temperature of the charged stock

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40.Heat transfer rate to the stock/charge in the furnace does not depend upon the

1. Emissivity of the refractory walls
2. Size of the furnace
3. Use of waste heat recovery equipments
4. Thickness of the stock

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