31. In the formulation or the Routh array, when ever difficulty 1 or difficulty 2 arises, it can be concluded that the system is :

(a) unstable

(b) conditionally stable

(c) marginally stable

(d) stable

32. If all the roots of the characteristic equation have negative real parts, then the system is :

(a) stable

(b) unstable

(c) conditionally stable

(d) marginally stable

33. If the system has non repeated poles on the jω axis, the system is :

(a) stable

(b) unstable

(c) marginally stable

(d) conditionally stable

34. 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

35. 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

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