Heat Transfer
Vent pipes are provided in a condenser to

Purge the condenser
Remove non-condensable gases
Facilitate easy cleaning of tubes
None 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
Achieve very high concentration of the final product
Facilitate forward feeding in multiple effect evaporation
Get economical temperature difference by using moderate pressure steam

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