Heat Transfer
As the difference between the wall temperature and bulk temperature increases, the boiling heat transfer co-efficient

goes through a maximum.
continues to decrease
continues to increase
goes through a minimum

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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

Heat transfer co-efficient in a single effect is much lower than that in any effect in a multieffect system
Boiling point elevation in a single effect system is much higher 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
Total heat transfer area of all the effects is -less than that in a single effect evaporator system

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