Thermal efficiency of an open hearth furnace may be about _____________ percent?

Related Mcqs:

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

A. Rate of firing and emissivity of flame B. Thermal conductivity of the charge & structural materials of furnace C. Nature of process; whether batch, continuous or intermittent D. All A., B. and C....

Shaft furnaces are used for_______________________?

A. Smelting B. Calcining C. Roasting D. All A., B. and C....

Coke ovens in steel plant are heated by____________________?

A. Electricity B. Blast furnace gas/mixed gas C. Coke oven gas D. Both B. and C....

Fuel used in B.F. stove is______________________?

A. Pulverised coal B. Furnace oil C. Blast furnace gas/mixed gas D. Coke oven gas...

______________ is an indirectly heated furnace?

A. Open hearth furnace B. Muffle furnace C. Soaking pit D. Reheating furnace...