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Control Systems

Control Systems
What is the open loop DC gain of a unity feedback control system having closed loop transfer function as

 9/4
 13/4
 4/13
 4/9

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Control Systems
Resonant peak of a marginally stable system is

 finite value
 any of the above
 0
 infinite

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Control Systems
If the magnitude of G(jω)H(jω) at phase crossover frequency is 0.5. Find the gain margin of the given system?

 2
 1
 0.5
 4

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Control Systems
The initial slope of Bode plot for a transfer function having no poles at the origin is

 +10dB/decade.
 -20dB/decade.
 0 dB/decade
 -10dB/decade.

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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

 2
 0
 1
 3

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Control Systems
Which of the following represents the value of resonant frequency (ωr)?

 2*(ωn) √(1-ζ²)
 (ωn) √(1-ζ²/2)
 (ωn) √(1-2ζ²)
 (ωn) √(1-ζ²)

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