Q20 — Control Systems

Q20

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In the Bode plot shown, the gain margin is the gain at the frequency represented by which point?

Two graphs showing the frequency response of a system. The top graph shows the gain in decibels as a function of frequency, ω. The gain starts at a high value, decreases gradually, and then drops off more steeply. Five points labeled A, B, C, D, and E are marked on the horizontal axis. The gain is zero at point C. The bottom graph shows the phase angle in degrees as a function of frequency, omega. The phase angle starts at 0 degrees, decreases gradually, and then drops off more steeply, approaching negative 270 degrees. Five points labeled A, B, C, D, and E are marked on the horizontal axis, corresponding to the same frequencies as in the top graph. The phase angle is negative 180 degrees at point B.