Furnace Technology

1. An electric furnace producing heat by means of an electric arc struck between each of three electrodes and the charge is called _________ furnace.

1. Resistance
2. Arc
3. Low frequency induction
4. None of these

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2. Power required in case of forced draught as compared to induced draught (for the same draught produced) is

1. Same
2. Less
3. More
4. Either more or less; depends on the flue gas density

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3._________ atmosphere is maintained inside an iron blast furnace.

1. Oxidising
2. Reducing
3. Inert
4. Decarburising

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4._________ furnace is not an electric furnace.

1. Arc
2. Induction
3. Pot
4. Resistance

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5._________ is an indirectly heated furnace.

1. Open hearth furnace
2. Muffle furnace
3. Soaking pit
4. Reheating furnace

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6.A refractory wall separating the stock and the source of heat is provided in a

1. Updraft kiln
2. Muffle furnace
3. Continuous furnace
4. None of these

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7.Acid dew point temperature (ADT) of a flue gas produced by the combustion of a fuel containing 1% sulphur may be about _________ °C.

1. 80
2. 130
3. 180
4. 250

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8.Advantages of use of preheated combustion air are

1. Saving in fuel consumption
2. Reduction in scale losses
3. Increase in flame temperature
4. All (A), (B) and (C)

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9.Air filtration in a furnace

1. Reduces its thermal efficiency
2. Is indicated by flame sting out
3. Increases the flue gas temperature
4. None of these

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10.Amount of coal lost in ash particle, which is carried through the boiler system, depends upon the

1. Physical nature, ash content and fineness of the coal
2. Amount of excess air supplied and load on the boiler
3. Type of burner and combustion chamber
4. All (A), (B) and (C)

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