FURNACE TECHNOLOGY QUIZ

Which of the following is the most important deterrants to an extended use of pulverised coal in boiler firing?

Erosion of induced draft fan blades

Excessive fly ash discharge from the stack

Ash disposal problem

Higher power consumption in its transportation

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In a heating process, a heat flow diagram in which the quantities of heat in the various items of a heat balance are represented by the width of a band is called the

None of these

Ostwald chart

Cox chart

Sankey diagram

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Turn down ratio of a burner

Should be 1:1 for a batch type furnace.

Should be as low as possible i.e., 1 : 2

Is normally much more for a continuous furnace as compared to a batch furnace

Is the ratio of maximum to minimum permissible heat input rates

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Which of the following is a periodic furnace?

Tunnel kiln

Soaking pit

Reheating furnace

Rotary kiln

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Artificial draught produced by a fan in the furnace can be controlled by the

Variation in the pitch of fan blades

Speed of the fan

Damper

All of these

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Ostwald charts are meant for

Computation of flue gas analysis

Computing the excess/deficiency of combustion air

None of these

Calculation of flue gas temperature

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Fuel economy in an industrial furnace operation can not be achieved by the use of

Recupterators

Combustion air not enriched with oxygen

Stoichiometric combustion air

Non-preheated combustion air

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Soaking pits are meant for heating steel

Sheets

Coils

Ingots

Slabs

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

Oxidation/scaling

Sulphur penetration

Either of the above

Decarburising

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Out of the following fuels used in a furnace exhausting flue gas at a temperature of 600°C, the percentage stack loss will be maximum in case of complete combustion of

Furnace oil with air

Furnace oil with oxygen

Blast furnace gas with air

Blast furnace gas with oxygen

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