Automatic Control Systems
Nichols chart consists of

None of these
Constant phase angle loci
Constant magnitude loci
Magnitude and phase angle loci in log-magnitude versus phase diagram

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Automatic Control Systems
A lag compensator

Improves steady state behavior and speeds up the transient response of the system
Speeds up the transient response of the system
Improves steady state behavior of the system
Improves steady state behavior and preserves the transient response of the system

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