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Control Systems

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

 ±2 db
 ±1 db
 ±3 db
 ±4 db

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Control Systems
The value of gain margin of the system having G ( s )H ( s ) = 8 / ( s + 2 )3 is

 4.
  8.
 6.
 2.

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Control Systems
Lead compensator is used to improve ------------------

 Steady state response
 Both 1 and 2
None of these
 Transient response

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Control Systems
Which of the following represents the value of resonant frequency (ωr)?

 (ωn) √(1-2ζ²)
 (ωn) √(1-ζ²)
 (ωn) √(1-ζ²/2)
 2*(ωn) √(1-ζ²)

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Control Systems
The open loop transfer function of a unity feedback system is given by G(s) = 1/(s+2)². The closed loop transfer function will have poles at

 -2,-1
 -2,2
 -2+j,-2-j
 -2,-2

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Control Systems
Find the corner frequency for the following transfer function? G(s) = 1/(s+2)

 1/2 rad/s
 4 rad/s
 2 rad/s
 1/4 rad/s

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