41. A system is critically damped. If the gain of the system is increased, the system will behave as :

(a) undamped

(b) underdamped

(c) overdamped

(d) no effect of gain

42. The effect of increase in the forward path gain of a control system on the damping ratio is that the damping ratio is :

(a) increased

(b) reduced

(c) not effected

(d) made zero

43. For a second – order systems as ξ is increased from zero, the response becomes :

(a) Progressively more oscillatory

(b) Progressively less oscillatory

(c) zero

(d) infinity

44. The roots of the characteristic equation are the same as the poles of the :

(a) closed-loop transfer function

(b) open –loop transfer function

(c) forward path transfer function

(d) none of these

45. The rise time of a second – order underdamped system is the time taken by the output to rise :

(a) from 10% to 90% of its final steady – state value

(b) from 0%to 100% to 100% of its final steady – state value

(c) from 5% ato 95% of its final steady – state value

(d) from 0% to 50% its final steady – state value

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