Furnace Technology MCQs

Question 1

To reduce the stack loss, heat recovery from flue gas can be done by

Accepted Answer

All of the above

Answer

Preheating of cold stock

Answer

Preheating of combustion air

Answer

Steam generation in waste heat boilers

Question 2

Specific heating capacity of a furnace is expressed as

Accepted Answer

Weight heated/hr/furnace volume

Answer

Weight heated/hr

Answer

Weight heated/furnace volume

Answer

None of these

Question 3

Protective gas used in the annealing furnace for steel coil comprises of

Accepted Answer

95% N 2 + 5% H 2

Answer

5% H 2 + 95% N 2

Answer

100% CO

Answer

100% H 2

Question 4

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

Accepted Answer

All of the above

Answer

CO

Answer

H 2

Answer

High CO/CO 2

Question 5

Decarburisation of steel

Accepted Answer

All of the above

Answer

Is the removal of carbon from iron carbide (Fe 3 C)

Answer

Affects its crystalline structure

Answer

Is favoured by CO 2

Question 6

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

Accepted Answer

CO in flue gas

Answer

No O 2 in flue gas

Answer

High excess air

Answer

None of these

Question 7

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

Accepted Answer

More of excess air

Answer

Less of excess air

Answer

More of CO in flue gas

Answer

More of CO 2 in flue gas

Question 8

Rate of heat release in a furnace, which is the measure of heat intensity is defined as

Accepted Answer

kcal/hr/m 3 combustion space

Answer

kcal/m 3 combustion space

Answer

kcal/hr

Answer

None of these

Question 9

Which is not accomplished in an underfired furnace?

Accepted Answer

Increase in heating capacity/m 2 of floor space

Answer

Elimination of cold spot at the bottom of the charge

Answer

Reduction in the temperature of furnace gases

Answer

Portection of the periphery of the charge from excessive radiation