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Control Systems

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

 ±4 db
 ±2 db
 ±3 db
 ±1 db

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Control Systems
If the magnitude of G(jω)H(jω) at phase crossover frequency is 0.5. Find the gain margin of the given system?

 0.5
 4
 1
 2

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Control Systems
Which of the following are the disadvantages of a closed loop control system?

 Reduces the overall gain.
All of these
 Complex and costly.
 Oscillatory response.

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Control Systems
The phase of lead compensator of the system G ( s ) = ( s + a ) / ( s + b ) is at its maximum at:

  a / b.
  ab.
 √( a / b).
  √( ab ).

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Control Systems
Force balancing equation of a mass element is (where, x = displacement)

 any of the above
 M d2x/dt2
 M *x
 M dx/dt

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Control Systems
The transfer function of a system is G(s) = 100/((s+1)(s+100)). For unit step input to the system the approximate settling time for 2% criterion is

 400 sec
 10 sec
 4 sec
 100 sec

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