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Furnace Technology

Furnace Technology
Thermal efficiency of a limestone calcination rotary kiln may be around __________ percent.

80
65
40
20

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Furnace Technology
Which furnace employs natural draft?

Boiler
Coke oven
Rotary kilns
L.D. converter

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Furnace Technology
Thickness of stock does not affect the fuel economy of furnaces, if the material to be heated is of

Low emissivity
High thermal conductivity
Both A and B
Neither A nor B

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Furnace Technology
Heat transfer rate to the charge/stock in a furnace does not depend upon the

Flue gas temperature
Type of fuels viz solid, liquid or gaseous
Initial temperature of the charged stock
Emissivity of refractory walls

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Furnace Technology
Which of the following is a directly fired intermittant furnace?

Tunnel kiln
Walking beam reheating furnace
Tower furnace
Reverberatory furnace

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

Regenerator
Ceramic recuperator
Metallic recuperator
None of these

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