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

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

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Heat Transfer
Steam trap is used to

Remove water resulting from partial condensation of steam
Stop the supply of steam
Condense the steam flowing in the pipeline
None of these

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