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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

 3.
 2.
 0.
 4.

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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?

 -1
 2
 1
 -2

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Control Systems
Slope of asymptote in Bode plot of 2nd order system is _____________________ per octave.

 6 dB
 12 dB
 18 dB
 3 dB

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Control Systems
The system having characteristic equation is used to be an oscillator. What is the value of k?

 2
 3
 4
 1

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Control Systems
A system has poles at 0.01 Hz, 1 Hz and 80 Hz; zeros at 5 Hz, 100 Hz and 200 Hz. The approximate phase of the system response at 20 Hz is

 180°
 -180°
 90°
 -90°

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Control Systems
When the system gain is doubled the gain margin becomes?

 1/2 times
 Remains unaffected
 2 times
None of these

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