ECE :: Automatic Control Systems
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A lead compensator is basically a
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In Bode diagram (log magnitude plot) of the factor 1/(1 + jωT) in the transfer function the log magnitude for ω << 1/T can be approximated by
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Assertion (A): The part of root locus on the real axis is not dependent on the poles and zeros which are not on the real axis.
Reason (R): Poles and zeros which are not on the real axis occur in conjugate pairs
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For underdamped second order systems the rise time is the time required for the response to rise from
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The open loop frequency response of a unity feed back system is as under
The gain margin and phase margin respectively are -
Assertion (A): A large negative feedback is deliberately introduced in an amplifier to make its gain independent of variation in parameters of active device.
Reason (R): A large negative value of feedback results in a high value of return difference compared to unity which makes the feedback gain inversely proportional to the feedback factor.
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The transfer function
can be for -
In response to a unit step input the controller output in given figure is for
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An electromechanical device which actuates a train of step angular movements in response to a train of input pulses on one to one basis is
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is constant and equal to - 90° for all values of ω
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and 
is more than 
.