FURNACE TECHNOLOGY QUIZ

Which furnace employs an I.D. fan for the removal of flue gases from the furnace?

Blast furnace stoves

High pressure boiler

Beehive coke oven

Coke oven

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Test specimen for determination of refractoriness under load (RUL) of a refractory is heated in a

Carbon resistance furnace

Furnace employing negative pressure

Reducing atmosphere

Furnace employing neutral atmosphere

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Furnace pressure is normally controlled by regulating the

Fuel gas pressure

Speed of I.D. fan

Air pressure

Damper

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Circulation of gases in furnace is caused by the

Difference in density between hot and cold gases

Change in volume during a change of temperature

Furnace pressure in conjunction with draft in flues

All of these

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The method of Lobo and Evans is concerned with the calculation of the

Heat transfer by forced convection in a reboiler

Heat absorption in radiant section of a furnace

Heat transfer in vacuum condensers

Mass transfer co-efficient

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

65

40

20

80

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Overall thermal efficiency of a lumpy coal fired suitably designed heating furnace, if operated & maintained properly may be about __________ percent.

25-30

65-70

45-50

44119

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In order to maintain an oxidising atmosphere in a furnace, it should have

More of CO in flue gas

Less of excess air

More of excess air

More of CO₂ in flue gas

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Rotary kilns are used in the

Calcination of limestone & dolomite

Neither A nor B

Cement manufacture

Both A and B

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Overfire burning in a furnace is a phenomenon characterised by

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

None of these

Supply of excess fuel

Supply of excess air

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YOUR ANSWER : ?

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