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Control Systems

Control Systems
A second order control system has a transfer function 16/(s² + 4s + 16). Find the settling time for 2% tolerance?

 4 sec
 2 sec
 10 sec
 5 sec

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Control Systems
A property of phase lead compensation is that the

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

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Control Systems
In which of the following controller band width is increased?

 nether 1 nor 2
 both 1 and 2
 proportional plus integral controller
 proportional plus derivative controller

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Control Systems
Number of roots in left hand half of s plane if characteristic equation is s3 - 4s2 + s + 6 = 0 ?

 0.
 3.
 2.
 1.

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Control Systems
When the system gain is doubled the gain margin becomes?

 2 times
 Remains unaffected
 1/2 times
None of these

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Control Systems
The characteristic equation of a feedback control system is given by s³ + 5s² + (k + 6)s + k = 0. In the root loci diagram, the asymptotes of the root loci for large 'k' meet at a point in the s-plane whose coordinates are

 (1,0)
 (2,0)
 (-2,0)
 (-1,0)

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