Question 3General Subjects - QMED

The correct answer is D) Cross flow. In a forced-convection finned-coil heat exchanger like an air-cooled hydraulic oil cooler, the air flow and the fluid flow (oil) are perpendicular to each other, resulting in a cross-flow heat exchange pattern. This cross-flow configuration maximizes the heat transfer between the two fluids by exposing a larger surface area of the coils to the air flow. The other options are incorrect because: A) Counter flow refers to the fluids flowing in opposite directions, B) Series flow means the fluids flow one after the other, and C) Parallel flow means the fluids flow side-by-side, none of which accurately describe the configuration of a finned-coil heat exchanger.