Furnace Technology MCQs

1. Which of the following advantages is not associated with the use of preheated air for combustion of a fuel in the furnace?

Increase in calorific value of the fuel

Increase in flame temperature

Reduction in scale losses

Saving in fuel consumption

✅ The correct answer is option A.

2. Shaft furnaces are used for

Smelting

Calcining

Roasting

All of the above

✅ The correct answer is option D.

3. Regenerators are normally provided in the

Glass melting furnace

Open hearth furnace

By product coke ovens

All of the above

✅ The correct answer is option D.

4. Unit of furnace loading is

Ton stock/hr/m² hearth area

Ton stock/hr

Ton stock/m² hearth area

Both B and C

✅ The correct answer is option A.

5. Very high pressure boilers are usually __________ boilers.

Fire tube

Water tube

Waste heat

Natural circulation

✅ The correct answer is option D.

6. Turndown ratio of a burner gives an idea of the __________ in the furnace.

Range of fuel firing rates

Volume of the combustion chamber

Maximum heat input rate only

Minimum heat input rate only

✅ The correct answer is option A.

7. Which of the following is not a directly fired furnace?

By-product coke oven

Calcination kiln

Sintering furnace

Open hearth furnace

✅ The correct answer is option A.

8. Which furnace employs preheating, heating and soaking zones?

Soaking pit

Reheating furnace

Open hearth furnace

Cupola

✅ The correct answer is option B.

9. Which is not a hearth furnace?

Glass tank furnace

Open hearth furnace

Cupola

Reheating furnace

✅ The correct answer is option C.

10. Which of the following accentuates clinker-ing troubles on furnace grate burning coal?

Low reactivity of carbonised residue containing high proportion of iron & sulphur

Low forced draft & fuel bed temperature

Thick firebed and preheated primary air

All of the above

✅ The correct answer is option D.