Automatic Control Systems
In root locus analysis the breakaway and break in points

None of these
lie on the real axis
Either lie on the real axis or occur in complex conjugate pairs
Always occur in complex conjugate pairs

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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 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 big positive number for zero and completing the array
Routh criterion can be used by substituting a small negative number for zero and complet-ing the array

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