NCCER Millwright Practice Exam

The speed at which an actuator moves depends on the ________

1. Diameter of the actuator

2. Flow rate

3. Type of fluid

4. Size of the motor

The correct answer is: Flow rate

The speed at which an actuator moves is primarily influenced by the flow rate of the fluid being used. In hydraulic systems, for example, the flow rate directly affects how much hydraulic fluid is delivered to the actuator, which in turn determines how quickly it can move. Higher flow rates result in faster movement, while lower flow rates mean slower movement. Other factors, such as the diameter of the actuator, type of fluid, and size of the motor, can affect performance characteristics but do not directly control the speed of movement as the flow rate does. The diameter of the actuator can influence the force produced, the type of fluid can impact efficiency and power, and the size of the motor can determine the overall capability of the system; however, it is ultimately the flow rate that dictates how quickly the actuator will respond and perform its work.