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Control Systems

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?

 4
 0.5
 1
 2

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Control Systems
The Laplace transform of a transportation lag of 5 seconds is

 1/(s+5).
 e-5s.
 e5s.
 1/(s-5).

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

 3°
 30°
 20°
 60°

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Control Systems
The transfer function of a system is G(s) = 100/((s+1)(s+100)). For unit step input to the system the approximate settling time for 2% criterion is

 10 sec
 4 sec
 100 sec
 400 sec

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Control Systems
When the polynomial is Routh Hurwitz,

 the function is not real.
 the roots of function have real parts which are to be zero/negative.
 all zeroes lie in the right half of the s-plane.
 none of these.

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Control Systems
A second order control system has F(jω) = 100/(100 - ω² + 10√2 jω). Find the resonant peak?

 0.5
 1.5
 0.707
 1

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