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Math model, Block Diag & SF Graph

Quick practice

Question 1 of 5

Consider a unity feedback closed loop control system having loop gain transfer function given by G(s) H(s)=\frac{4}{(s+2)^{2}}.  From its root locus diagram which of the following options can be correct:-

1. Stable system for K > –4

2. GM = 1

3. PM = 180°

The correct statements are

A

1 and 2

B

All

C

1 and 3

D

2 and 3

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