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
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AA-3, B-1, C-2, D-4
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BA-4, B-3, C-2, D-1
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CA-3, B-4, C-1, D-2
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DA-3, B-4, C-2, D-1
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EA-2, B-4, C-1, D-3
Answer
Correct Answer: A-3, B-4, C-1, D-2
Explanation
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:
A (Servomotor) → actuator converting control signals to motion/torque ⇒ 3.B (Amplidyne) → power amplifier with high gain for heavy loads ⇒ 4.C (Potentiometer) → error detector via differential voltage ⇒ 1.D (Flapper valve) → pneumatic transducer (displacement→pressure) ⇒ 2.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