Control Components: Match Each Device to Its Function in a Control System List I A. Servomotor B. Amplidyne C. Potentiometer D. Flapper valve (pneumatic) List II Error detector Transducer Actuator Power amplifier

Introduction / Context:
Classical control systems combine sensing, power amplification, and actuation. Correctly identifying each component’s role helps in designing and troubleshooting servo loops, especially in electro-mechanical and pneumatic systems.

Given Data / Assumptions:

• Servomotor provides mechanical actuation under command signal control.
• Amplidyne is an electromechanical power amplifier capable of large gain.
• Potentiometer commonly serves as an error detector by comparing reference and feedback positions via voltage division.
• Flapper-nozzle pneumatic element converts displacement to pressure change, serving as a transducer in pneumatic controllers.

Concept / Approach:

Map each device to its canonical function: actuator for motion, power amplifier for control power, error detection for command-feedback difference, and transduction for physical-to-signal conversion (here, displacement to pressure).

Step-by-Step Solution:

Verification / Alternative check:

Block diagrams of servo mechanisms place potentiometers in the error-summing junction, amplidynes before servomotors for high-power drive, and flapper-nozzle stages at pneumatic controller inputs.

Why Other Options Are Wrong:

Assigning the servomotor as a power amplifier is incorrect; it is the load actuator. The flapper valve is not an error comparator; it transduces mechanical displacement into pneumatic pressure.

Common Pitfalls:

Confusing transducers (sensor/pressure conversion) with actuators (motion/force). Also, mixing an electronic power amplifier with an amplidyne’s electromechanical amplification concept.

Final Answer:

A-3, B-4, C-1, D-2