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In regenerative air preheater (as practised in heating of coke ovens), the heat is transferred | |
A. | through a metallic wall. [Wrong Answer] |
B. | by direct contact of hot flue gas with air. [Wrong Answer] |
C. | by heating an intermediate material (like chequor bricks) and then heating the air from this hot material. [Correct Answer] |
D. | none of these. [Wrong Answer] |