Heat Transfer
The advantage of using a 1 - 2 shell and tube heat exchanger over a 1 - 1 shell and tube heat exchanger is

Lower tube side pressure drop
Lower shell side pressure drop
Higher shell side heat transfer co-efficient
Higher tube side heat transfer co-efficient

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Heat Transfer
Steam trap is used to

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

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