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

Thermal conductivity of the charge & structural materials of furnace
Nature of process ; whether batch, continuous or intermittant
All of these
Rate of firing and emissivity of flame

ANSWER DOWNLOAD EXAMIANS APP

Furnace Technology
Recuperator is

Heavier than regenerator meant for the same duty
Not used for fuel gas preheating
A continuous waste heat recovery equipment
An intermittant waste heat recovery equipment

ANSWER DOWNLOAD EXAMIANS APP