Heat Transfer
A composite wall consists of two plates A and B placed in series normal to the flow of heat. The thermal conductivities are kA and kB and the specific heat capacities are CPA and CPB for plates A and B respectively. Plate B has twice the thickness of plate A. At steady state, the temperature difference across plate A is greater than that across plate B, when

CPA < CPB
KA>2 kB
CPA > CPB
KA < 0.5kB

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

By direct contact of hot flue gas with air
None of these
By heating an intermediate material (like chequor bricks) and then heating the air from this hot material
Through a metallic wall

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