Automatic Control Systems - ECE Questions and Answers

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Consider the following statements about root locus

The intersection of root locus branches with the imaginary axis can be determined by the use of Routh criterion
Segments of real axis having an odd number of real axis open loop poles plus zeros to their right are not parts of root locus
The number of root locus branches terminating on infinity is always zero

Which of the above statements are correct?

1, 2 and 3

1 and 2 only

1 only

2 and 3 only