In regenerative air preheater (as practised in heating of coke ovens), the heat is transferred

Question: In regenerative air preheater (as practised in heating of coke ovens), the heat is transferred
[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

Explanation:

No answer description available for this question.