41. Sinusoidal oscillators are :
(a) stable
(b) unstable
(c) marginally stable
(d) conditionally stable
42. The openloop transfer function of a control system is given by G(s) = (K(s+8))/(S( s+4)(s+a)) The smallest possible value of a for which the system is stable in the closedloop for all positive value of K is :
(a) 0
(b) 4
(c) 8
(d) 12
43. The routh stability criterion for testing the stability of system is :
(a) an algebraic method
(b) a graphical method
(c) combination of a and b
(d) none of these
44. The openloop transfer function of a unity negative feedback control system is given by G(s) = (K(s+4))/(S( s+2)(s+6)) For K >4, the stability characteristics of the openloop and closedloop configurations of the system are, respectively
(a) stable and stable
(b) unstable and stable
(c) stable and unstable
(d) unstable and unstable
45. Because of the addition of a zero to G(s)H(s), the stability of the system is :
(a) improved
(b) reduced
(c) not affected
(d) none of these
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