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Control Systems

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

 4.
 0.
 2.
 3.

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Control Systems
For a lead compensator, the poles lie:

  on origin.
  on LHS before zero.
  on LHS.
  on RHS.

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Control Systems
Find the angles of asymptotes of the open loop transfer function G(s) = k(s + 1)/((s(s+2)(s+4)?

 90°,270°
 0°, 180°
 60°,240°
 90°,180°

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Control Systems
Transfer function of a control system depends on

 nature of input.
 system parameters alone.
 nature of output.
 initial conditions of input and output.

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Control Systems
A property of phase lead compensation is that the

 overshoot is increased.
 bandwidth of closed loop system is reduced.
 gain margin is reduced.
 rise time of closed loop system is reduced.

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Control Systems
The transfer function of phase lead compensator is given by , where, T > 0, α < 0. What is the maximum phase shift provided by this compensator?

 cos-1((1 - α)/(1 + α)
 both 1 and 3
 tan-1((1 - α)/(2√α)
 sin-1((1 - α)/(1 + α)

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