Furnace Technology MCQs

Question 1

In a furnace operation, which is not preheated?

Accepted Answer

Both A and B

Answer

Solid fuels

Answer

Hydrocarbon containing fuel gases (e.g. coke oven gas, refinery gas etc.)

Answer

Neither A nor B

Question 2

Soaking pits are meant for heating steel

Accepted Answer

Ingots

Answer

Coils

Answer

Sheets

Answer

Slabs

Question 3

Turn down ratio of a burner

Accepted Answer

Is the ratio of maximum to minimum permissible heat input rates

Answer

Should be as low as possible i.e., 1 : 2

Answer

Should be 1:1 for a batch type furnace.

Answer

Is normally much more for a continuous furnace as compared to a batch furnace

Question 4

Heat transfer takes place through a liquid medium surrounding the submerged material under heating, in case of a/an

Accepted Answer

Salt bath furnace

Answer

Blast furnace

Answer

Steam boiler

Answer

Annealing furnace

Question 5

Unit of furnace loading is

Accepted Answer

Ton stock/hr/m2 hearth area

Answer

Ton stock/hr

Answer

Ton stock/m2 hearth area

Answer

Both B and C

Question 6

Acid dew point temperature (ADT) of a flue gas produced by the combustion of a fuel containing 1% sulphur may be about __________ °C.

Accepted Answer

130

Answer

80

Answer

180

Answer

250

Question 7

Which furnace employs natural draft?

Accepted Answer

Coke oven

Answer

Boiler

Answer

Rotary kilns

Answer

L.D. converter

Question 8

Heat balance of furnace provides means of determining the

Accepted Answer

All of the above

Answer

Thermal efficiency of the process

Answer

Sources of heat losses

Answer

Scope of reduction of heat losses

Question 9

Waste heat from the outgoing flue gases in a thermal power plant is recovered by a/an

Accepted Answer

All of the above

Answer

Economiser

Answer

Steam superheater

Answer

Air preheater