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An Intiative by Sri Chaitanya
a
In Blast furnace both fire box and hearth are combined in big chamber and ore and fuel also kept their
b
Reverberatory furnace has both fire box and hearth separated, but the vapours (flame) obtained due to the burning of the fuel touch the ore in the hearth and heat it
c
In furnaces like retort furnaces there is no direct contact between the hearth or fire box and even the flames do not touch the ore.
d
All
answer is D.
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