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Control Systems

Control Systems
The unit step response of the system is 1 - e-t(1+t). Which is the system?

 unstable
 oscillatory
 critically stable
 stable

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Control Systems
A control system has open loop transfer function G(s) = k/(s(s + 2). Find the break away point?

 2
 -1
 -2
 1

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

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Control Systems
Type and order of transfer function G (s) = K / {s(s + 2)}

 1, 2.
 2, 1.
 1, 1.
 0, 2.

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Control Systems
The open loop transfer function of a unity feedback control system is given by G(s) = k/s(s+1). If the gain k is increased to infinity, then damping ratio will tend to become

 zero
 infinite
 0.707
 unity

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Control Systems
The system is initially critical damped. If the gain of the system is doubled, then it will exhibit

 critical damped characteristics.
 over damped characteristics.
 undamped characteristics.
 under damped characteristics.

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