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Control Systems

Control Systems
A second order under damped system has damping ratio of 0.3. Find the phase margin of the system?

 3°
 60°
 20°
 30°

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Control Systems
Negative feedback in a closed loop control system

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

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Control Systems
The transfer function for tachometer E(S)/θ(S) is

 KS
 KS2
 K/S
 K

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Control Systems
Time constant is defined as the time taken by the response of the system to reach ----------- ?

 100% of the final value
 50% of the final value
 63% of the final value
 70.7% of the final value

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Control Systems
The optimum values of damping ratio is --------------

 0.9 to 1.1
 0.3 to 5
 0.3 to 0.7
 0 to 2

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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.
 4.
 2.
 3.

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