Furnace Technology MCQs Archives

11. Presence of SO₂ in furnace gases attacks the ferrous metal by way of

Accelerating the rate of scaling

Causing metal embrittlement

Attacking the grain boundaries; particularly severe on low carbon and nickel bearing steels at high temperature

All of the above

✅ The correct answer is option D.

12. In a furnace, the heat taken by the charge/stock and the heat lost to the furnace structure & flue gases depends on the

Rate of firing and emissivity of flame

Thermal conductivity of the charge & structural materials of furnace

Nature of process ; whether batch, continuous or intermittant

All of the above

✅ The correct answer is option D.

13. In furnaces operating at very high temperature (say) 1250°C, e.g. soaking pit), the maximum heat transfer takes place by

Conduction

Convection

Radiation

Can not be predicted

✅ The correct answer is option C.

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

Speed of the fan

Damper

Variation in the pitch of fan blades

All of the above

✅ The correct answer is option D.

15. Low stack loss indicates the

Use of sub-stoichiometric air for combustion

Efficient use of fuel

Inefficient use of fuel

Oxygen enrichment of combustion air

✅ The correct answer is option B.

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

Emissivity of the refactory walls

Size of the furance

Use of waste heat recovery equipments

Thickness of the stock

✅ The correct answer is option C.

17. The heat recoverable from flue gases of furnaces depends on the

Thermal efficiency of furnace

Quantity of flue gases

Flue gas temperature drop through the furnace

All of the above

✅ The correct answer is option D.

18. Which is a continuous furnace?

Coke ovens

Annealing furnace

Glass tank furnace

None of these

✅ The correct answer is option C.

19. Which one is not an induced draught furnace?

Blast furnace stove

Sintering furnace

High pressure boiler

None of these

✅ The correct answer is option A.

20. The advantages of firing pulverised coal in the furnace lies in the fact that, it

Permits the use of high ash content coal

Permits the use of low fusion point ash coal

Accelerates the burning rate and economises on fuel consumption

All of the above

✅ The correct answer is option C.