Multiple choice

Despite the presence of negative feedback, control systems still have problems of instability because the

  1. used components have nonlinearities

  2. dynamic equations of the subsystems are not known

  3. mathematical analysis involves approximations

  4. system has large negative phase angle at high frequencies
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A Correct answer
Explanation

Despite the presence of negative feedback, control systems still have problems of instability because used components have nonlinearity. There are always some variations as compared to ideal characteristics.

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