Heat Transfer
A dilute aqueous solution is to be concentrated in an evaporator system. High pressure steam is available. Multiple effect evaporator system is employed, because

Total heat transfer area of all the effects is -less than that in a single effect evaporator system
Boiling point elevation in a single effect system is much higher than that in any effect in a multieffect system
Heat transfer co-efficient in a single effect is much lower than that in any effect in a multieffect system
Total amount of vapor produced per Kg of feed steam in a multiple effect system is much higher than in a single effect

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Heat Transfer
In a heat exchanger, one transfer unit means

None of these
The size of the exchanger in which heat transfer rate is 1 kcal/hr
Both A and B
A section of the exchanger in which change in temperature of one stream equals the average driving force in the section

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

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

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