Heat Transfer
In case of vertical tube evaporator, with increase in liquor level, the overall heat transfer co-efficient

Increases
Decreases
May increase or decrease; depends on the feed
Is not affected

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Heat Transfer
Water always boils when its

Vapour pressure equals 76 cm of Hg
Saturated vapour pressure is less than the atmospheric pressure
Saturated vapour pressure equals the external pressure on its surface
Temperature reaches 100° C

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