Thermal efficiency of blast furnace stoves used for heating blast (air) may be about _______________ percent.

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Ram Sharma

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📊 Furnace Technology

Q. Thermal efficiency of blast furnace stoves used for heating blast (air) may be about _______________ percent.

(A) 20
(B) 40
(C) 60
(D) 80

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✅ Correct Answer: (D) 80

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