Heat Transfer
For a cold dilute feed to produce thick viscous liquor, backward feeding as compared to forward feeding results in

Increased economy
Decreased economy
Lower capacity
No effect on economy

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

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

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