Furnace Technology MCQs

Question 1

Maximum heat transfer in high temperature furnaces is by

Accepted Answer

Radiation

Answer

Conduction

Answer

Convection

Answer

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

Question 2

Fuel economy in furnaces can be achieved by

Accepted Answer

All of the above

Answer

Using oxygen enriched combustion air

Answer

Preheating the combustion air

Answer

Reducing the heat loss through furnace openings & doors

Question 3

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

Accepted Answer

Increase in calorific value of the fuel

Answer

Increase in flame temperature

Answer

Reduction in scale losses

Answer

Saving in fuel consumption

Question 4

Operation of blast furnace stove is based on the principles of a __________ furnace.

Accepted Answer

Regenerative

Answer

Recuperative

Answer

Both A and B

Answer

Neither A nor B

Question 5

In practical operation of any furnace, zero oxygen percentage or theoretical CO2 percentage in flue gas is rarely achieved, because of

Accepted Answer

Imperfect mixing of fuel & air and infiltration of air

Answer

Use of non-preheated combustion air

Answer

Use of pulverised solid fuels

Answer

Use of excessive positive draft in the furnace

Question 6

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

Accepted Answer

All of the above

Answer

Accelerating the rate of scaling

Answer

Causing metal embrittlement

Answer

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

Question 7

The main function of a muffle in the muffle furnace is to

Accepted Answer

Both A & B

Answer

Protect the charge from the effects of the products of combustion

Answer

Smooth out temperature inequalities on the combustion side of the muffle wall

Answer

Neither A nor B

Question 8

Which of the following is a periodic furnace?

Accepted Answer

Soaking pit

Answer

Tunnel kiln

Answer

Rotary kiln

Answer

Reheating furnace

Question 9

Low stack loss indicates the

Accepted Answer

Efficient use of fuel

Answer

Use of sub-stoichiometric air for combustion

Answer

Inefficient use of fuel

Answer

Oxygen enrichment of combustion air