Heat Transfer
In a co-current double pipe heat exchanger used for condensing saturated steam over the inner tube, if the entrance and exit conditions of the coolant are interchanged, then the rate of condensation will

Increase
Remain unchanged
Either increase or decrease; depends on the coolant flow rate
Decrease

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Heat Transfer
The advantage of backward feed multiple effect evaporators over forward feed units is that

Equal heat transfer co-efficients exist in various effects
Heat sensitive material can be handled
Most concentrated liquid is at highest temperature
There is no additional cost of pumping

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