FURNACE TECHNOLOGY QUIZ

__________ is an indirectly heated furnace.

Open hearth furnace

Muffle furnace

Soaking pit

Reheating furnace

TRUE ANSWER : ?
YOUR ANSWER : ?

Blast furnace stoves are meant for heating

None of these

Blast furnace gas

Steam

Air

TRUE ANSWER : ?
YOUR ANSWER : ?

Oxygen percentage in the flue gas coming out of a gaseous fuel fired furnace should be ideally about __________ percent.

< 2

< 5

< 8

< 10

TRUE ANSWER : ?
YOUR ANSWER : ?

Maximum heat transfer in high temperature furnaces is by

Conduction

Either A, B or C; depends on the type of furnace

Radiation

Convection

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Rotary hearth

Walking beam

Shaft

Tunnel

TRUE ANSWER : ?
YOUR ANSWER : ?

Thermal efficiency of furnaces can be improved by

All of these

Minimising heat losses from furnace walls

Waste heat recovery from flue gas

Maintaining proper draught

TRUE ANSWER : ?
YOUR ANSWER : ?

Which is not accomplished in an underfired furnace?

Portection of the periphery of the charge from excessive radiation

Reduction in the temperature of furnace gases

Elimination of cold spot at the bottom of the charge

Increase in heating capacity/m² of floor space

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is the most suitable for preheating combustion air above 650°C ?

Regenerator

Metallic recuperator

None of these

Ceramic recuperator

TRUE ANSWER : ?
YOUR ANSWER : ?

Regenerators as compared to recuperators for the same duty

Involve higher initial cost

Are lighter & compact

Store smaller quantity of waste heat

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

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

20

80

65

40

TRUE ANSWER : ?
YOUR ANSWER : ?

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