Automatic Control Systems
Which dc servomotor requires strongest permanent magnet?

Surface wound armature
Either A or B
Surface wound with stationary rotor
Slotted armature

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

M loci are centred about (0 dB, -180°) point
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

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