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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:

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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°

This question was posed to me during an interview.

My doubt is from Construction of Root Loci topic in division The Root Locus Technique of Control Systems

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Best answer
The correct option is (b) 180°,0°

Best explanation: As it is type zero system therefore the angle of arrival can be either 180°, 0°.

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