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Control Systems

Control Systems
The magnitude of a transfer function G(jω)H(jω) at gain cross over frequency is

 infinity
 any of the above
 1
 0

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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

 (2,0)
 (-1,0)
 (-2,0)
 (1,0)

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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

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

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Control Systems
The system function N(s) = V(s)/I(s) = (s+3)/(4s+5). The system is initially at rest. If the excitation i(t) is a unit step, which of the following is the initial value?

 3/9
 1/4
 3/5
 0

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Control Systems
For the polynomial , number of roots which lie in the right half of s-plane is

 2
 3
 4
 1

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

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

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