36. If the characteristic equation of a system is s^2+4s+10 =0, the system is :
(a) undamped
(b) overdamped
(c) critically – damped
(d) underdamped
37. The rise time is the time taken by the output to rise from 10% to 90% of its final steady state value, in case of :
(a) undamped systems
(b) underdamped systems
(c) overdamped systems
(d) critically – damped systems
38. As type of system is increased :
(a) more errors are eliminated
(b) more errors are introduced
(c) closed – loop transfer function
(d) none of these
39. If the characteristic equation of a system is s^2+6s+8 =0, the system is :
(a) undamped
(b) underdamped
(c) critically-damped
(d) overdamped
40. For critically – damped system, the damping ratio is :
(a) ξ=0
(b) ξ=∞
(c) ξ
(d) ξ=1
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