Scaling of furnace stock is reduced by _______________ in flue gas?

Which of the following variables affects the furnace capacity ?

A. Temperature of flue gas

B. Thermal conductivity of stock

C. Thickness of heating stock

D. All A., B. and C.

An improved and fuel efficient version of the pusher type reheating furnace is the ______________ furnace?

A. Walking beam

B. Shaft

C. Tunnel

D. Rotary hearth

Forced recirculation of furnace gases is practised_______________?

A. To increase heat transfer by convection

B. To ensure uniform temperature

C. In furnaces, operating below 750°C

D. All A., B. and C.

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.

Flue gas outlet temperature from the chimney of any furnace should be ideally about ______________ °C?

A. 50

B. 100

C. 150

D. 250