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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

 4
 64
 16
 1

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Control Systems
When the polynomial is Routh Hurwitz,

 all zeroes lie in the right half of the s-plane.
 the function is not real.
 the roots of function have real parts which are to be zero/negative.
 none of these.

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Control Systems
The second order system defined by 25/(s2 + 5s + 25) is given a step input. The time taken for the output to settle with in 2 % of input is

 1.2 sec.
 0.4 sec.
 2 sec.
 1.6 sec.

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Control Systems
The characteristic equation of a feedback control is 2s4 + s3 + 3s2 + 5s + 10 = 0. The no of roots in the right half of the s-plane is

 3.
 2.
 4.
 0.

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Control Systems
The compensator would provide a maximum phase shift of

 20o.
 60o.
 30o.
 45o.

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Control Systems
The input-output relationship of a linear time invariant continuous time system is given by r(t) = d²c(t)/dt² + 3 dc(t)/dt + 2 c(t) Where r(t) and c(t) are input and output respectively. What is the transfer function of the system equal to?

 1/(s² + 3s + 2)
 1/(s² + s + 2)
 2/(s² + s + 2)
 2/(s² + 3s + 2)

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