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Control Systems

Control Systems
The phase margin of a system having the loop transfer function G(s)H(s) = 2√3/s(s+1) is

 60°
 45°
 30°
 80°

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Control Systems
The magnitude condition for root locus is ..................

 |G(s)H(s)| = ∞
 |G(s)H(s)| = 0
 |G(s)H(s)| = 1
 |G(s)H(s)| = 2

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

 1/2 times
 Remains unaffected
None of these
 2 times

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Control Systems
Open loop transfer function,

 band reject filter.
 all pass filter.
None of these
 band stop filter.

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Control Systems
A function y (t) satisfies the following differential equation : Where, δ (t) is the delta function. Assuming zero initial condition and denoting the unit step function by u(t), y(t) can be formed as

 et.
 e-t.
 etu(t).
 e-tu(t).

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Control Systems
The characteristic equation of a control system is give by s(s + 4)(s² + 2s + 1) + k(s + 1) = 0. Find the angle between the asymptotes?

 360°
 180°
 120°
 60°

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