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Control Systems

Control Systems
The closed loop transfer function of a unity feedback control system is 9/(s² + 3s + 9), then the type of the system is

 2
 3
 0
 1

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Control Systems
Which of the following is the correct expression for the transfer function of an electrical RC phase lag compensating network?

 RCS/(1+RCS)
 C/(1+RCS)
 RC/(1+RCS)
 1/(1+RCS)

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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
 -2,2
 -2+j,-2-j

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Control Systems
A linear time invariant system, initially at rest when subjected to a unit step input gave response c(t) = te-t (t ≥ 0). The transfer function of the system is

 s/(s+1)
 s/(s+1)2
 1/s(s+1)2
 (s+1)2/s

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Control Systems
A linear time invariant system has an impulse response e2t for t > 0 . If initial condition are 0 and input is e3t, the output for t > 0 is

  e3t - e2t.
  e2t - e3t.
  e5t.
  e2t + e3t.

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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

 0.
 3.
 2.
 4.

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