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In pneumatic control systems the control valve used as final control element converts

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In pneumatic control systems the control valve used as final control element converts

(a) Pressure signal to electric signal

(b) Pressure signal to position change

(c) Electric signal to pressure signal

(d) Position change to pressure signal

The question was posed to me in an online quiz.

This intriguing question comes from Pole Placement by State Feedback in division State Variable Analysis and Design of Control Systems

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Correct option is (b) Pressure signal to position change

For explanation I would say: In pneumatic control system the control force is the air and and can be used as final control element converts the pressure signal to position change.

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