Question

A pneumatic actuator converts:

• A. The pneumatic signal into electrical signal
• B. The pneumatic signal into position
• C. The pneumatic signal into pressure
• D. The electrical signal into pneumatic signal

Hint:

Actuators always produce mechanical movement (displacement, velocity, or position).
Pneumatic actuators use air pressure as input to position a valve plug or mechanical link.
Converters change signal types (e.g., current to pressure), while actuators perform physical work.

Answer 1

The Correct Option is B

Step 1: Understanding the Question:
The question asks about the operational function of a pneumatic actuator, specifically identifying the physical input and output conversion process.

Step 2: Detailed Explanation:

• An actuator is a device responsible for moving or controlling a mechanism or system (such as opening or closing a control valve).

• A pneumatic actuator uses compressed air as its energy source.

• The input to the actuator is a modulated pneumatic pressure signal (typically in the standard range of $3\text{ to }15\text{ psi}$).

• This pneumatic signal acts on a flexible diaphragm or a piston inside a cylinder, opposing the force of a range spring.

• The resulting force causes physical displacement of the actuator stem, thereby converting the fluid pressure signal into linear or rotational mechanical position (or displacement).

• Hence, it converts a pneumatic signal into physical position.

Step 3: Final Answer:
A pneumatic actuator converts the incoming pneumatic signal into physical position.