Pick out the wrong statement

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Pick out the wrong statement.

A. By increasing the number of shell passes, the temperature cross in a shell and tube heat exchanger can be prevented

B. An underdesigned steam trap will back up the condensate instead of discharging it out

C. Steam condensate is corrosive because of the presence of dissolved oxygen in it

D. Film boiling is desirable in commercial equipments due to high heat transfer rate at low temperature drop

Answer: Option D

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