Pick out the wrong statement

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Pick out the wrong statement.

A. Superheated steam is preferably not used for process heating because of its low heat transfer film co-efficient

B. In a shell and tube heat exchanger, the shell pressure drop is maximum for orifice baffles

C. S.I. unit of fouling factor is Watt/m².°K

D. Longitudinal fins are used in extended surface heat exchangers, when the direction of fluid flow is parallel to the axis of the tube

Answer: Option C

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