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Control Systems

Control Systems
Given a unity feedback system with G(s) = k/s(s+4), the value of k for damping ratio of 0.5 is

 16
 1
 4
 64

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Control Systems
A second order under damped system has damping ratio of 0.3. Find the phase margin of the system?

 3°
 20°
 30°
 60°

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Control Systems
Given the transfer function of a system. Which of the following characteristics does it have?

 Critical damped
 Over damped
 Under damped
 any of the above

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Control Systems
The unit impulse response of second order system is 1/6 * e-0.8t sin(0.6t). THen the natural frequency is

 2 rad/s
 1 rad/s
 0.8 rad/s
 0.6 rad/s

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Control Systems
The characteristic equation of a feedback control system is given by s³ + 5s² + (k + 6)s + k = 0. In the root loci diagram, the asymptotes of the root loci for large 'k' meet at a point in the s-plane whose coordinates are

 (1,0)
 (2,0)
 (-2,0)
 (-1,0)

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Control Systems
The open loop transfer function of a unity feedback system is given by G(s) = 1/(s+2)². The closed loop transfer function will have poles at

 -2,-1
 -2,-2
 -2+j,-2-j
 -2,2

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