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Control Systems

Control Systems
In a control system, an integrator is represented by

  s.
  1 / s.
 1 / s2.
  s2.

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Control Systems
A system is stable for (where GM = Gain Margin and PM = Phase Margin):

 GM -ve.
 GM and PM both -ve.
 PM - ve.
 GM and PM both +ve.

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Control Systems
The value of 'a' in to give phase margin = 45o will be

 0.707.
 0.9.
 1.414.
 1.18.

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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

 2.000.
 0.500.
 1.386.
 0.693.

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Control Systems
A open loop transfer function is given as G(s) = (s+2)/(s+1)(s-1). Find the number of encirclements about '-1+j0'?

 3
 0
 2
 1

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Control Systems
A system has poles at 0.01 Hz, 1 Hz and 80 Hz; zeros at 5 Hz, 100 Hz and 200 Hz. The approximate phase of the system response at 20 Hz is

 90°
 -90°
 -180°
 180°

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