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Control Systems

Control Systems
The following transfer function represents a phase-lead compensator?

 (s+4)/(s+6)
 1/s
 (s+4)/(3s+6)
 (4s+2)/(6s+1)

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

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

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

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Control Systems
The value of gain margin of the system having G ( s )H ( s ) = 8 / ( s + 2 )3 is

  8.
 4.
 6.
 2.

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Control Systems
A unity feed back system has forward transfer function The range of k for the system to be stable is

 0 < k < 3900.
None of these
 0 < k < 390.
 0 < k < 39.

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Control Systems
The characteristic equation of a control system is given by What are the angles of asymptotes of the root loci for k ≥ 0?

 0°, 120°, 240°
 120°, 180°, 240°
 0°, 180°, 300°
 60°, 180°, 300°

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