Heat Transfer
For condensation of pure vapors, if the heat transfer co-efficients in filmwise and drop-wise condensation are respectively hf and hd, then

hf < hd
hf > hd
hf = hd
hf could be greater or smaller than hd

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Heat Transfer
Finned tube heat exchangers

are used for smaller heat load
use metal fins of low thermal conductivity
give larger area per tube
facilitate very large temperature drop through tube wall

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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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