Heat Transfer
A backward feed multiple effect evaporator is better than forward feed for concentrating cold feed, because it provides

Both A & B
Lower capacity
Higher economy
Lower economy

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Heat Transfer
Leidenfrost point is a term concerned with the

Condensation of the saturated vapor on a cold surface
Concentration of a corrosive solution by evaporation
Boiling of a liquid on a hot surface
Heat transfer between two highly viscous liquids

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