Consider the root locus shown in figure FIG.2 for the negative feedback control

Question

Consider the root locus shown in figure FIG.2 for the negative feedback control system with characteristic 1 + kG(s)H(s) = 0 as k varies from zero to infinity, answer questions (21)-(25): The open loop poles are at A. 0, -1 B 0, -1, -2 C. 0, -2 D. -1, -2 The open loop zeros are at A. 0.-1.-2 B.-2.-00 C.-1.0 D. none 23 The closed loop control system is stable when A 0 0 D. none The closed loop control system is unstable when A. 0 0 D. none The range of k > 0 such that the settling time is less than one second the unit step response has oscillations when A. 0 0 D. none

Explanation / Answer

Q21. open loop poles in root locus are represented using '×' in the plot. So, open loop poles are 0,-1.

So, Option A is correct.

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