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Control Systems

Control Systems
First Foster form of a LC network represents which element in the beginning?

 Inductor.
 Both A and B.
 Capacitor.
 Resistor.

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Control Systems
The second order system defined by 25/(s2 + 5s + 25) is given a step input. The time taken for the output to settle with in 2 % of input is

 1.2 sec.
 0.4 sec.
 2 sec.
 1.6 sec.

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Control Systems
A first order control system is initially at 0 V and subjected to a sudden input at t=0. Its output reaches 1.1 V in 4 sec and eventually reaches steady state of 2 V. Find the time constant?

 2 sec
 6 sec
 4 sec
 5 sec

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Control Systems
When the input to a system was with drawn at t = 0, its output was found to decrease exponentially from 1000 units to 500 units in 1.386 sec. The time constant of the system is

 0.693.
 0.500.
 2.000.
 1.386.

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Control Systems
A proportional plus derivative controller

 has high sensitivity
 improves the steady state accuracy
 both 1 and 2
 increases the stability of the system

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

 unstable
 stable
 marginally stable
 critical stable

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