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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

 0.
 2.
 4.
 3.

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Control Systems
A system of constant voltage and constant frequency is called _________________ system.

  infinite.
None of these
  feedback.
  zero.

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

 2
 4
 1
 3

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Control Systems
A proportional plus derivative controller

 increases the stability of the system
 improves the steady state accuracy
 has high sensitivity
 both 1 and 2

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Control Systems
Consider the following statements for phase lead compensation:

 both 1 and 2
 Phase lead compensation shifts the gain crossover frequency to the right
 nether 1 nor 2
 The maximum phase lag occurs at the arithmetic mean of the two corner frequencies.

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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?

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

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