Questions & Answers of Bode Plots

A Bode magnitude plot for the transfer function G(s) of a plant is shown in the figure. Which one of the following transfer functions best describes the plant?

The Bode magnitude plot of the transfer function GS=K1+0.5s1+ass1+s81+bs1+s36 is shown below: Note that -6 dB/octave = -20 dB/decade. The value of abk is_____________.

For the transfer function

GS=5s+4ss+0.25s2+4s+25

The values of the constant gain term and the highest corner frequency of the Bode plot respectively are

The Bode plot of a transfer function G(s) is shown in the figure below.

The gain (20logG(s)) is 32 dB and –8 dB at 1 rad/s and 10 rad/s respectively. The phase is negative for all ω. Then G(s) is