Ceramic recuperators (made of SiC) is economical, only when used for preheating combustion air above __________ °C.

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Ram Sharma

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Q. Ceramic recuperators (made of SiC) is economical, only when used for preheating combustion air above __________ °C.

(A) 250
(B) 650
(C) 850
(D) 1000

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✅ Correct Answer: (B) 650

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