Automatic Control Systems - Engineering

Q1:

Consider the following statements:
  1. If any root of characteristic equation has a positive real part the impulse response is unbounded and system is unstable.
  2. If all the roots of a characteristic equation have negative real parts, the impulse response decays to zero.
  3. If one or more non-repeated roots of characteristic equation are on jω axis impulse response is bounded but the system is unstable.
Which of the above equations are correct?

A 1, 2 and 3

B 1 and 2 only

C 1 and 3 only

D 2 and 3 only

ANS:A - 1, 2 and 3

No answer description is available.