FURNACE TECHNOLOGY QUIZ

Pulverised fuel fired furnaces employ __________ fuel firing.

Tangential

All of these

Vertical

Horizontal

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Which is not a hearth furnace?

Cupola

Open hearth furnace

Reheating furnace

Glass tank furnace

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__________ atmosphere is maintained inside an iron blast furnace.

Oxidising

Inert

Reducing

Decarburising

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Low stack loss indicates the

Inefficient use of fuel

Use of sub-stoichiometric air for combustion

Efficient use of fuel

Oxygen enrichment of combustion air

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

Emissivity of refractory walls

Type of fuels viz solid, liquid or gaseous

Initial temperature of the charged stock

Flue gas temperature

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In which of the waste heat recovery equipment, the flow of flue gas and air is alternately reversed after a fixed interval of time?

Regenerator

None of these

Waste heat boiler

Recuperator

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The function of an economiser in a boiler is to preheat the

Pulverised coal

Combustion air

Feedwater

Furnace oil

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The purpose of controlling the furnace atmosphere is to prevent surface attack by

Oxidation/scaling

Decarburising

Sulphur penetration

Either of the above

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In a muffle furnace, the muffle

Permits the use of controlled atmosphere for the protection of stock

Retards the heat transfer

Assists in temperature equalisation in the charge

All of these

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

Type of burner and combustion chamber

Physical nature, ash content and fineness of the coal

All of these

Amount of excess air supplied and load on the boiler

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