In furnaces operating at very high temperature (say 1250°C, e.g. soaking pit), the maximum heat transfer takes place by
A : a. conduction
B : b. convection
C : c. radiation
D : d. can not be predicted.
In practical operation of any furnace, zero oxygen percentage or theoretical CO? percentage in flue gas is rarely achieved, because of
A : a. use of non-preheated combustion air.
B : b. use of pulverised solid fuels.
C : c. imperfect mixing of fuel & air and infiltration of air.
D : d. use of excessive positive draft in the furnace.