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

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