List of top Electronics and Communication Engineering Questions on Stability of Systems

The value of K for which the unity feedback system \( G(s) = \frac{K{S(S+2)(S+4)} \) crosses the imaginary axis is
The characteristic equation of a system is $s^3 + 3s^2 + 3s + 1 = 0$. How many poles lie in the right half plane?
Which of the following system is not stable with input \( x(n) \) and output \( y(n) \)?