Q1: Baffles in the shell side of a shell and tube heat exchanger

ANS:C - increase the shell side heat transfer co-efficient.

Baffles in the shell side of a shell and tube heat exchanger serve several purposes, but they do not directly decrease the shell side heat transfer coefficient. Instead, they are typically designed to enhance heat transfer efficiency by promoting turbulence and mixing of the fluid. Therefore, the correct option is: "Baffles in the shell side of a shell and tube heat exchanger increase the shell side heat transfer coefficient." Baffles increase turbulence and disrupt laminar flow patterns, which can lead to improved heat transfer between the shell side fluid and the tube bundle. They also help in directing the fluid flow across the entire surface area of the tubes, preventing channeling and ensuring more uniform heat distribution. So, the statement "increase the shell side heat transfer coefficient" is accurate.