FURNACE TECHNOLOGY QUIZ

In producer gas making furnace, steam is added along with air to mainly control the

Tar content in producer gas

Temperature of producer gas

V. of producer gas

Fusion of coal ash & clinker formation

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If fuel and air are mixed ahead of the burner, it is called a/an __________ burner.

Premix

Outside mixing type

Rotary

Diffusion

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In a furnace operation, which is not preheated?

Hydrocarbon containing fuel gases (e.g. coke oven gas, refinery gas etc.)

Both A and B

Solid fuels

Neither A nor B

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The heating capacity of muffle furnace depends on the

Properties of the muffle wall (temperature, area, emissivity)

Both A & B

Neither A nor B

Surface area & emissivity of the stock

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Specific heating capacity of a furnace is expressed as

Weight heated/hr/furnace volume

Weight heated/hr

Weight heated/furnace volume

None of these

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Thermal efficiency of blast furnace stoves used for heating blast (air) may be about __________ percent.

80

20

40

60

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Overfire burning in a furnace is a phenomenon characterised by

Supply of excess fuel

Burning carbon monoxide and other incombustible in upper zone of furnace by supplying more air

None of these

Supply of excess air

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Which is not accomplished in an underfired furnace?

Reduction in the temperature of furnace gases

Portection of the periphery of the charge from excessive radiation

Elimination of cold spot at the bottom of the charge

Increase in heating capacity/m² of floor space

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To reduce the stack loss, heat recovery from flue gas can be done by

Preheating of cold stock

Preheating of combustion air

Steam generation in waste heat boilers

All of these

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Tunnel kilns are usually used for

Reheating of slabs

Melting of glass

Roasting of pyrites

Drying/tempering of refractories

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