Direct motion command is most closely associated with which component?

• A. Valve actuator
• B. Servo motor
• C. Pressure transducer
• D. Temperature sensor

Answer: (B)

Direct motion command means a control signal that tells an actuator exactly how to move, including where to go and how fast. A servo motor is built to take that direct command from a controller—typically a position or velocity setpoint—and drive the motor to reach it, using an encoder to provide feedback and correct any error along the way. This closed-loop arrangement lets the system achieve precise, repeatable motion, which is why a servo motor is the best match for translating a motion command into actual movement.

The other options don’t provide motion control in the same way. A pressure transducer or a temperature sensor measures a process parameter rather than moving anything. A valve actuator can move a valve, but without the integrated feedback and precise positioning typical of servo systems, it isn’t the component most closely associated with issuing and executing a direct motion command.