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

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

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Automatic Control Systems
If any term in the first column of a Routh array becomes zero, then

Routh criterion can be used by substituting a small positive number for zero and completing the array
Routh criterion can be used by substituting a small negative number for zero and complet-ing the array
Routh criterion can be used by substituting a big positive number for zero and completing the array
Routh criterion cannot be used to determine stability

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Automatic Control Systems
In a two phasor servomotor, the direction of rotation of the rotating field depends on

Magnitudes of voltages applied to the two stator windings
Phase relation of voltages applied to the two stator windings
Both magnitude and phase relationship of voltages applied to the two stator windings
None of these

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