Furnace Technology MCQs

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

Should be 1:1 for a batch type furnace.

Is the ratio of maximum to minimum permissible heat input rates

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

Preheating of cold stock

Preheating of combustion air

Steam generation in waste heat boilers

All of the above

Type of fuels viz solid, liquid or gaseous

Flue gas temperature

Emissivity of refractory walls

Initial temperature of the charged stock

Oct-15

25-30

45-50

65-70

15

40

70

85

Higher calorific value

Better combustion

Smokeless burning

Less erosion on furnace wall

Coke ovens

Open hearth furnace

Both A & B

Neither A nor B

Ingots

Slabs

Steel coils

Steel sheets

Store smaller quantity of waste heat

Are lighter & compact

Involve higher initial cost

All of the above

Ammonia

Fine dolomite

Alkaline powders

None of these