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

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

It is symmetric about -180°
M loci are centred about (0 dB, -180°) point
(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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Automatic Control Systems
A lag compensator

Speeds up the transient response 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
Improves steady state behavior of the system

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