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Control Systems

Control Systems
Given a unity feedback system with G(s) = k/s(s+4), the value of k for damping ratio of 0.5 is

 4
 64
 16
 1

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Control Systems
The transfer function of the control system depends on

 initial conditions of input and output.
 nature of the output.
 nature of the input.
 the system parameters alone.

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Control Systems
The characteristic equation of a control system is given by What are the angles of asymptotes of the root loci for k ≥ 0?

 60°, 180°, 300°
 0°, 120°, 240°
 120°, 180°, 240°
 0°, 180°, 300°

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Control Systems
A property of phase lead compensation is that the

 bandwidth of closed loop system is reduced.
 rise time of closed loop system is reduced.
 gain margin is reduced.
 overshoot is increased.

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Control Systems
Negative feedback in a closed loop control system

 reduces sensitivity to parameter variation.
 reduces gain.
All of these
 improves disturbance rejection.

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

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

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