If a hydraulic system is in continuous operation, and is equipped with an air cooled heat exchanger, the fan should __________.

Correct Answer: Option A — be in continuous operation as long as the main pump prime mover is in operation

Air-cooled heat exchangers in continuous-duty hydraulic systems must operate whenever the pump is running to prevent thermal degradation of the oil. Excessive heat lowers viscosity, leading to internal leakage, reduced volumetric efficiency, and accelerated wear of precision hydraulic components like pumps and valves.