Heat Transfer
The average heat transfer co-efficient for laminar film condensation on vertical surface is inversely proportional to (where, ΔT = Temperature drop across condensate film )

ΔT
(ΔT)2
(ΔT)1/4
None of the listed here

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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
Through a metallic wall
By heating an intermediate material (like chequor bricks) and then heating the air from this hot material

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