Stability Theory » Exercise - 135. The terms in the first column of the Routh array of characteristic equation of a certain system are 5, 7, 4, 3, -2. The number of roots of the characteristic equation in the right-half of the s-plane is equal to : (a) 2 (b) 1 (c) 3 (d) none of these
Stability Theory » Exercise - 129. The terms in the first column of the Routh array of the characteristic equation of a certain system are 4, 7, 6, -5, -4, -3. The number of roots of the characteristic equation in the right-half of the s-plane is equal to : (a) 2 (b) 1 (c) 3 (d) none of these
Stability Theory » Exercise - 138. The terms in the first column of the Fouth array of the characteristic equation of certain system are 2, 1, 8, -7, 2, 6 The number of roots of the characteristic equation in the right-half of the s-plane is equal to : (a) 2 (b) 3 (c) 1 (d) none of these
Stability Theory » Exercise - 130. The characteristic equation 1 + G(s)H(s) = 0 of a system is given by s4 + 8s3 +12s2 +8s + K = 0 For the system to remain stable, the value of gain K should be : (a) zero (b) 0< K (c) >11 (d) positives
Stability Theory » Exercise - 253. The phase margin of a system is 40˚. The damping ratio of the system ξ is approximately : (a) 0.04 (b) 0.4 (c) 4 (d) cannot be estimated