Furnace Technology

11.An example of a periodic furnace is the

1. Blast furnace stoves
2. Blast furnace
3. Coke oven heating chamber
4. Rotary kilns

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12.An example of indirectly heated furnace is the

1. Soaking pit
2. Muffle furnace
3. Reheating furnace
4. None of these

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13.An example of recuperative furnace is the

1. Soaking pit
2. Open hearth furnace
3. Coke ovens
4. None of these

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14.An example of shaft furnace is the

1. L.D. converter
2. Glass melting tank
3. Blast furnace
4. Soaking pit

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15.An improved and fuel efficient version of the pusher type reheating furnace is the _________ furnace.

1. Walking beam
2. Shaft
3. Tunnel
4. Rotary hearth

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16.Artificial draught produced by a fan in the furnace can be controlled by the

1. Speed of the fan
2. Damper
3. Variation in the pitch of fan blades
4. All (A), (B) and (C)

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17.Blast furnace stoves are meant for heating

1. Air
2. Blast furnace gas
3. Steam
4. None of these

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18.Cement Kiln is a

1. Rotary Kiln
2. Tunnel Kiln
3. Natural draft furnace
4. Batch furnace

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19.Ceramic coating material for furnace refractory, which increases its emissivity and thus the radiation heat transfer rate in the furnace, comprises of

1. Graphite powder
2. Thoria
3. Zircon powder
4. Beryllium

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20.Ceramic recuperators (made of SiC) is economical, only when used for preheating combustion air above _________ °C.

1. 250
2. 650
3. 850
4. 1000

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