Automatic Control Systems
Which of the following is open loop system?

System for controlling antirocket missiles
Wind screen wiper
Aqualing
Respiratory system of animal

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Automatic Control Systems
A lag compensator

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

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

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

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