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Control Systems

Control Systems
The open loop transfer function of non unity negative feedback system is , then the number of root locus branches equal to

 0.
 3.
 1.
 2.

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Control Systems
Time response for a second order control system depends on value of ξ. If ξ>1 then the system is called as

 over damped system.
 undamped system .
 under damped system.
 critically damped system.

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

 ±4 db
 ±1 db
 ±3 db
 ±2 db

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Control Systems
Sparking between the contacts can be reduced by inserting

 a reactor in the line.
  a capacitor in parallel with the contacts.
 a capacitor in series with the contacts.
 a resistor in the line.

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Control Systems
What is the order of a closed loop control system for a plant with a transfer function equal to G(s) = k/s²(1+Ts) and with unity feedback

 0
 1
 3
 2

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Control Systems
A transfer function is given as The steady state sinusoidal response will become zero at a frequency response of

 4 rad/s
 3 rad/s
 2 rad/s
 9 rad/s

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