FURNACE TECHNOLOGY QUIZ

Thermal efficiency of furnaces can be improved by

Maintaining proper draught

All of these

Waste heat recovery from flue gas

Minimising heat losses from furnace walls

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Use of waste heat recovery equipments

Emissivity of the refactory walls

Size of the furance

Thickness of the stock

TRUE ANSWER : ?
YOUR ANSWER : ?

Thermal efficiency of an open hearth furnace may be about __________ percent.

5

20

80

50

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Combustion of coal by supplying it around the burner

Transportation of coal

Preheating the primary air

Drying of coal

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is a batch furnace?

Glass tank furnace

Cupola

None of these

Reheating furnace

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following furnaces will have maximum thermal efficiency?

Boiler furnace

Rotary kilns

Soaking pits

Walking beam reheating furnace

TRUE ANSWER : ?
YOUR ANSWER : ?

Advantages of use of preheated combustion air are

Saving in fuel consumption

Reduction in scale losses

All of these

Increase in flame temperature

TRUE ANSWER : ?
YOUR ANSWER : ?

Scaling of furnace stock is reduced by __________ in flue gas.

H₂

High CO/CO₂

CO

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is not a directly fired furnace?

By-product coke oven

Calcination kiln

Sintering furnace

Open hearth furnace

TRUE ANSWER : ?
YOUR ANSWER : ?

An improved and fuel efficient version of the pusher type reheating furnace is the __________ furnace.

Tunnel

Rotary hearth

Shaft

Walking beam

TRUE ANSWER : ?
YOUR ANSWER : ?

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