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Furnace Technology

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

80
130
250
180

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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

Conduction
Radiation
Can not be predicted
Convection

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Furnace Technology
Which of the following is not a directly fired furnace?

Calcination kiln
Sintering furnace
By-product coke oven
Open hearth furnace

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Furnace Technology
In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of

Drying of coal
Combustion of coal by supplying it around the burner
Transportation of coal
Preheating the primary air

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Furnace Technology
__________ atmosphere is maintained inside an iron blast furnace.

Inert
Oxidising
Reducing
Decarburising

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

Preheating of combustion air
Preheating of cold stock
Steam generation in waste heat boilers
All of these

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