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Control Systems

Control Systems
The characteristic equation has the following roots for over damped stable system?

 -2,-4
 -2,2
 -2±j4
 -2,-2

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Control Systems
The magnitude condition for root locus is ..................

 |G(s)H(s)| = ∞
 |G(s)H(s)| = 0
 |G(s)H(s)| = 1
 |G(s)H(s)| = 2

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Control Systems
Which of the following is/are the advantages of a closed loop control system?

 The closed loop systems are accurate.
 both 1 and 2.
 nether 1 nor 2.
 The closed loop systems are less affected by noise.

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Control Systems
Negative feedback in a closed loop control system

 improves disturbance rejection.
 reduces sensitivity to parameter variation.
All of these
 reduces gain.

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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?

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

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Control Systems
For a unity feedback control system open loop transfer function then position error constant is

 0.
 20.
 40.
 infinity.

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