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Which of the following is the non-linearity caused by servomotor?

(a) Static friction

(b) Backlash

(c) Saturation

(d) None of the mentioned

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This interesting question is from Mathematical Preliminaries topic in portion Stability in Frequency Domain of Control Systems

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The correct option is (c) Saturation

For explanation: Linearity in the servo-motor is due to the saturation present and which is the important consideration for any type of the practical device.

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