Question

Which of the following is not an actuator?

• A. Hydraulic actuator
• B. Digital actuator
• C. Pneumatic actuator
• D. Electric actuator

Hint:

An actuator generates physical movement, while "digital" refers to control signals rather than a physical mechanism.

Answer 1

The Correct Option is B

Step 1: Understand the definition of an actuator.
An actuator is a device that converts energy into motion. Common types of actuators include:
- Hydraulic actuators (1) use fluid pressure to produce mechanical movement,
- Pneumatic actuators (3) use compressed air to create motion,
- Electric actuators (4) use electric power to create movement.
A digital actuator (2) is not a recognized physical actuator type. Digital refers to control signals or logic, not a direct means of motion generation.
Step 2: Conclusion
Thus, a digital actuator is not a type of actuator.
Final Answer: \[ \boxed{\text{Digital actuator}} \]