Q. 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) S.I. unit of fouling factor is Watt/m².°K
• (C) In a shell and tube heat exchanger, the shell pressure drop is maximum for orifice baffles
• (D) Longitudinal fins are used in extended surface heat exchangers, when the direction of fluid flow is parallel to the axis of the tube