Example of an indirectly heated furnace is__________________?
Correct answer: B. Both A. and B.
- A. Hood annealing furnace
- B. Both A. and B.
- C. Muffle furnace
- D. Neither A. nor B.
Explanation
A muffle furnace heats the charge through a surrounding hot wall rather than exposing it directly to combustion gases. Hood annealing also uses an enclosing hood or cover for indirect heating, so both listed examples qualify.
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