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Control Systems

Control Systems
Find the corner frequency for the following transfer function? G(s) = 1/(s+2)

 2 rad/s
 1/4 rad/s
 1/2 rad/s
 4 rad/s

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Control Systems
If the transfer function of a phase lead compensator is (s+a)/(s+b) and that of a lag compensator is (s+p)/(s+q), then which one of the following sets of conditions must be satisfied?

 a > b, p > q
 a > b, p < q
 a < b, p < q
 a < b, p >q

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Control Systems
A unity feedback control system has an open loop transfer function G(s) = k/(s(s² + 7s + 12) The gain k for which s = -1 + j1 will lie on the root locus of the system is

 4
 5
 6.5
 10

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Control Systems
The open loop transfer function for unity feedback system is given by 5(1+0.1s) / (s(1+5s)(1+20s)) Find the steady state error for a step input of magnitude 10 is equal to

 5.
 2.
 zero.
 infinite.

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Control Systems
Which of the following are the disadvantages of a closed loop control system?

 Complex and costly.
 Reduces the overall gain.
All of these
 Oscillatory response.

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Control Systems
The open loop transfer function of a unity feedback control system is given by G(s) = k/s(s+1). If gain k is increased to infinity, then damping ratio will tend to become

 0.707
 zero
 unity
 infinite

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