Automatic Control Systems
For any transfer function, the constant phase angle loci are

A family of circles
Neither (a) nor (b)
A family of straight lines
Either (a) or (b)

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Automatic Control Systems
A lag compensator

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

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