Red Seal Industrial Mechanic (Millwright) Practice Exam

The key components of a hydraulic system include the hydraulic pump, actuators, valves, and hydraulic fluid. The hydraulic pump is essential as it converts mechanical energy into hydraulic energy by circulating the hydraulic fluid throughout the system. This fluid is then directed to actuators, which are devices that convert the hydraulic energy back into mechanical energy to perform work, such as moving parts or lifting loads. Valves play a critical role in controlling the flow and pressure of the hydraulic fluid; they direct the fluid to different parts of the system and regulate the speed and force of the actuators. Finally, hydraulic fluid is necessary for transmitting power within the system while also providing lubrication and cooling. This combination of components allows hydraulic systems to operate effectively and efficiently in various industrial applications, making answer B the most accurate representation of a hydraulic system's fundamental parts. Other options do not contain the essential components necessary for the operation of hydraulic systems.