Stability Theory » Exercise - 134. For the application of Routh’s test, all the coefficients of the characteristic equation must be : (a) real (b) imaginary (c) complex (d) none of these
Stability Theory » Exercise - 12. A unity feedback system has In the root-locus, the break-away point occurs between : (a) s = 0 and -1 (b) s = -1 and -∞ (c) s = -1 and -2 (d) s = -2 and -∞
Stability Theory » Exercise - 262. The Nyquist plot intersects the real axis at –a = -0.02, the gain margin is : (a) -0.02 (b) +0.02 (c) 50 (d) cannot be estimated
Stability Theory » Exercise - 254. The damping ratio of a second-order system is 0.2. Its phase margin is approximately : (a) 0.4˚ (b) 2˚ (c) 20˚ (d) 40˚
Stability Theory » Exercise - 255. A polar plot crosses the real axis at (-1 + j0) point. The gain margin of the system is : (a) -1˚ (b) 0˚ (c) -180˚ (d) +180˚