1.

The OLTF of a unity feedback system is K(s+2)(s+4)/(s+5)(s+6) the angle of arrival of the root loci as s =-2, and s =-4 respectively are:

A. 0 ,180
B. 180 ,0
C. 90 ,180
D. 180 , 90
Answer» C. 90 ,180


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