Heat Transfer
Heat transfer in the laminar sublayer in case of a liquid flowing through a pipe, is mostly by

Convection
Conduction
None of these
Eddies current

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

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

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