ECE :: Automatic Control Systems
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Coulomb friction is
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A feedback amplifier has forward gains A1, A2 and feedback factor β as shown in signal flow graph of the given figure. Because of feedback as shown in signal noise ratio at output will
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The damping ratio of a pair of complex poles when expressed in terms of angle θ measured from jω axis equal to
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Assertion (A): Derivative control action is also called rate control and has an anticipatory character.
Reason (R): Derivative control amplifies noise signals.
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Assertion (A): When a PID controller is added to a system, the peak overshoot to step input cannot be determined easily.
Reason (R): Use of PID controller introduces a zero in the forward path.
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For the system shown in the given figure the time response to unit step input is
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The slope of log magnitude asymptote changes by - 40 dB/ decade at a certain frequency and the error between asymptote and actual curve is - 6 dB. This means that
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Friction forces acts in a direction
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Assertion (A): Integral control action is sometimes called reset control.
Reason (R): Reset rate is expressed as number of repeats per unit time.
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. Then steady state error is
