Heat Transfer
During crystallisation, formation of crystal can occur in __________ solution only.

Saturated
Undersaturated
Supersaturated
All of these

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Heat Transfer
Vacuum is generally maintained in the vapour space of an evaporator mainly to

Concentrate heat sensitive materials
Get economical temperature difference by using moderate pressure steam
Facilitate forward feeding in multiple effect evaporation
Achieve very high concentration of the final product

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