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In an automatic control system which of the following elements is not used?

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In an automatic control system which of the following elements is not used?

(a) Error detector

(b) Final control element

(c) Sensor

(d) Oscillator

This question was addressed to me in a job interview.

My enquiry is from Linear Approximation of the Non-Linear System topic in chapter Control System and Components of Control Systems

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The correct option is (d) Oscillator

The explanation: In an automatic control system oscillator is not used because the oscillator increases the oscillations but our aim is to reduce the oscillations and hence oscillator is not used.

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