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Control Systems

Control Systems
The closed loop transfer function of a unity feedback control system is 9/(s² + 3s + 9), then the type of the system is

 3
 0
 1
 2

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Control Systems
What is the order of a closed loop control system for a plant with a transfer function equal to G(s) = k/s²(1+Ts) and with unity feedback

 0
 3
 1
 2

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Control Systems
In polar plots if the critical point '-1+j0' is enclosed then the system is --------

 marginally stable
 stable
 unstable
 critical stable

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Control Systems
A second order system has peak over shoot = 50% and period of oscillations 0.2 seconds. Find the resonant frequency?

 30.63 rad/s
 29.74 ra/s
 32.16 rad/s
 31.41 rad/s

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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)?

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

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Control Systems
First Foster form of a LC network represents which element in the beginning?

 Inductor.
 Resistor.
 Capacitor.
 Both A and B.

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