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Control Systems

Control Systems
Error at corner frequency ωcf of first order control system is -------

 ±4 db
 ±1 db
 ±2 db
 ±3 db

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Control Systems
A proportional plus integral controller

 both 2 and 3
 it increases rise time
 increases the stability of the system
 has high sensitivity

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Control Systems
Differentiation of parabolic response is a -------------- response?

 impulse
 step
 ramp
 parabolic

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Control Systems
Consider the following statements for phase lead compensation:

 nether 1 nor 2
 both 1 and 2
 The maximum phase lag occurs at the arithmetic mean of the two corner frequencies.
 Phase lead compensation shifts the gain crossover frequency to the right

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Control Systems
To achieve the optimum transient response, the indicating instruments are so designed as to

 provide damping which is slightly more than the critical value.
 be critically damped.
 provide damping which is slightly less than the critical value.
 be undamped.

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Control Systems
In polar plots if the critical point '-1+j0' is enclosed then the system is --------

 stable
 marginally stable
 unstable
 critical stable

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