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Which of the following may result in instability problem?

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Which of the following may result in instability problem?

(a) Large error

(b) High selectivity

(c) High gain

(d) Noise

I had been asked this question in my homework.

The query is from Compensation Techniques topic in portion Digital Control Systems of Control Systems

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Correct choice is (c) High gain

Explanation: High gain results in instability problem and this is due to the low damping factor and damping factor is inversely proportional to the gain of the system.

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