FURNACE TECHNOLOGY QUIZ

Circulation of gases in furnace is caused by the

Difference in density between hot and cold gases

All of these

Change in volume during a change of temperature

Furnace pressure in conjunction with draft in flues

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following variables does not affect the furnace capacity?

Size of the furnace

None of these

Gas velocity in furnace

Ratio of wall surface to surface of stock

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Reverberatory furnace is used for

Roasting/reduction of ores

Heating air

Steel melting

Annealing steel coil

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Which one shows the diagramatic heat balance in a furnace?

Ostwald chart

None of these

Sankey diagram

Cox chart

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In reverberatory furnace, charge is heated mainly by

Natural convection

Radiation of heat from the roof of the combustion chamber

Conduction

None of these

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Waste heat from the outgoing flue gases in a thermal power plant is recovered by a/an

All of these

Air preheater

Steam superheater

Economiser

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Shaft furnaces are used for

Calcining

Roasting

All of these

Smelting

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Low stack loss indicates the

Oxygen enrichment of combustion air

Inefficient use of fuel

Use of sub-stoichiometric air for combustion

Efficient use of fuel

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Furnace aerodynamics is related to the __________ in the furnace.

Measurement of flue gas volume

Pressure adjustment

Movement of gases

Temperature control

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Power required in case of forced draught as compared to induced draught (for the same draught produced) is

Same

Less

More

Either more or less; depends on the flue gas density Answer: Option B

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