Which of the following is not an actuator ?

A. DC Motor

B. Stepper Motor

C. Relay

D. Shutter doors

Correct Answer is :

D. Shutter doors

Explanation

An actuator is a device that converts control signals into physical movement or action. Let’s look at each option:

• DC Motor – Actuator (converts electrical energy into rotation).
• Stepper Motor – Actuator (provides precise rotational movement).
• Relay –Actuator (electrically operated switch).
• Shutter doors – Not an actuator themselves, but actuated by motors or other actuators.