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Control Systems

Control Systems
For type 1 system with parabolic input, the steady state error is

 zero.
 indeterminate.
 finite constant.
 infinite.

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Control Systems
Certain control system has input u(t) and output c(t). If the input is first passed through a block having transfer function e-s and unit gain is applied to the applied to the system. The modified output will be

 c(t-1).u(t-1)
 c(t-1).u(t)
 c(t).u(t-1)
 c(t)u(t)

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Control Systems
Angle condition for complimentary root locus or inverse root locus is

 ± (2q) 360°
 ± (2q + 1) 360°
 ± (2q) 180°
 ± (2q + 1) 180°

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Control Systems
Sparking between the contacts can be reduced by inserting

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

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Control Systems
Which system is also known as automatic control system?

 Closed loop control system
 Either 1 or 2
 Open loop control system
 Nether 1 nor 2

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Control Systems
A proportional plus derivative controller

 increases the stability of the system
 improves the steady state accuracy
 has high sensitivity
 both 1 and 2

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