Final answer:
A single journal bearing with square shaft support experiences radial load only, as it is designed to support loads perpendicular to the shaft's axis, with thrust bearings handling axial loads.
Step-by-step explanation:
The question pertains to the type of load that a single journal bearing with a square shaft support will experience. In this case, the correct answer is B. Radial Load Only. A journal bearing is designed to support a rotating shaft and typically handles radial loads that act perpendicular to the axis of the shaft. Axial loads, which act along the axis of the shaft, would instead be handled by thrust bearings. Therefore, when considering a single journal bearing designed for a square shaft support, it primarily handles radial loads, as the square shaft prevents rotation about the shaft's axis, which would introduce axial load.