Control Systems - GATE practice papers - Electronics & Communication for Q. 503

Q.  Which among the below stated conditions is/are precise for non-minimum phase function? (Marks : 02)
- Published on 19 Oct 15

a. It consists of at least one pole or zero at RHS of an imaginary axis
b. It consists of symmetric poles and zeros about imaginary axis in s-plane
c. It consists of at least one symmetric pair of pole & zero at RHS of real axis
d. It does not contain any poles or zeros in the RHS of an imaginary axis

ANSWER: It consists of at least one pole or zero at RHS of an imaginary axis
 
If the transfer function possesses at least one pole or zero at RHS of an imaginary axis, then the system is said to be in ' Non-minimum Phase while options (b) &(d) represent the conditions of all-pass and minimum phase systems/transfer functions respectively

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