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Control Systems

Control Systems
Name test signals used in time response analysis?

  Impulse.
  Unit step.
  Unit ramp.
  All of B, C, D.

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Control Systems
Which of the following transfer functions represent under damped second order systems?

 2/(s² + 2s + 2)
 1/(s² + s + 1)
 4/(s² + 2s + 4)
All of these

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Control Systems
Sparking between the contacts can be reduced by inserting

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

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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 characteristic equation has the following roots for over damped stable system?

 -2,2
 -2,-4
 -2,-2
 -2±j4

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Control Systems
The device necessarily used for automatic temperature control in a furnace is

 Thermocouple.
 Thermostat.
 Auto-transformer.
 Any of above.

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