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Control Systems

Control Systems
The open loop transfer function of non unity negative feedback system is , then the number of root locus branches equal to

 3.
 0.
 2.
 1.

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Control Systems
Which of the following is/are the characteristics of negative feedback control system?

 Reduction in gain at the expense of better stability
 Rejection of disturbance signals
 Low sensitivity to parameter variations
All of these

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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?

 0.5
 1
 4
 2

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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

 4 sec
 10 sec
 400 sec
 100 sec

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

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

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Control Systems
The open loop transfer function of a unity feedback control system is given by G(s) = k/s(s+1). If gain k is increased to infinity, then damping ratio will tend to become

 infinite
 0.707
 zero
 unity

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