Automatic Control Systems - Engineering

Q1:

The slope of log-magnitude asymptote changes by - 40 dB/ decade at a frequency ω1. This means that

A a double pole is present

B a pair of complex conjugate poles is present

C either a double pole or a pair of complex conjugate poles is present

D a pole or zero at origin is present

ANS:C - either a double pole or a pair of complex conjugate poles is present

A double pole or pair of complex poles result in - 40 dB/decade slope in log magnitude graph.