______________ is an indirectly heated furnace?
Correct answer: B. Muffle furnace
- A. Open hearth furnace
- B. Muffle furnace
- C. Soaking pit
- D. Reheating furnace
Explanation
A muffle furnace heats the charge indirectly through a surrounding refractory chamber, so the material does not contact the flame or combustion gases. Open-hearth, soaking-pit, and ordinary reheating furnaces expose the charge more directly to furnace gases and radiation.
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