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Furnace Technology

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

20
65
40
80

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

Amount of excess air supplied and load on the boiler
All of these
Physical nature, ash content and fineness of the coal
Type of burner and combustion chamber

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Furnace Technology
In furnaces operating at very high temperature (say) 1250°C, e.g. soaking pit), the maximum heat transfer takes place by

Convection
Can not be predicted
Conduction
Radiation

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Furnace Technology
Fuel used in B.F. stove is

Coke oven gas
Pulverised coal
Furnace oil
Blast furnace gas/mixed gas

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

Preheating the combustion air
Oxygen enrichment of combustion air
Preheating the fuel gas
All of these

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Furnace Technology
Maximum thermal efficiency of boiler may be about __________ percent.

25
90
65
10

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