Automatic Control Systems
A conditionally stable system is stable for the value of gain between two critical values. It is unstable if

None of these
The gain is decreased below lower critical value
Both A and B
The gain is increased beyond upper critical value

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Automatic Control Systems
Which of the following features is not associated with Nichols chart?

It is symmetric about -180°
(0 dB, -180°) point on Nichols chart represent critical Point (-1, 0)
The frequency at intersection of G(j?) locus and M = +3 dB locus gives bandwidth of closed loop system
M loci are centred about (0 dB, -180°) point

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