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Q#1 Root Locus Technique GATE EE 2015 MCQ +2 marks -0.66 marks

The open loop poles of a third order unity feedback system are at 0, -1, -2. Let the frequency corresponding to the point where the root locus of the system transit to unstable region be K. Now suppose we introduce a zero in the open loop transfer function at -3, while keeping all the earlier open loop poles intact. Which one of the following is TRUE about the point where the root locus of the modified system transits to unstable region?

It corresponds to a frequency greater than K

It corresponds to a frequency less than K

It corresponds to a frequency K

Root locus of modified system never transits to unstable region.

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