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Control Systems

Control Systems
The closed loop transfer function of a unity feedback control system is 9/(s² + 3s + 9), then the type of the system is

 3
 0
 2
 1

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Control Systems
The unit step response of the system is 1 - e-t(1+t). Which is the system?

 oscillatory
 critically stable
 unstable
 stable

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Control Systems
When the system gain is doubled the gain margin becomes?

 2 times
 Remains unaffected
None of these
 1/2 times

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Control Systems
Force balancing equation for elastic element (K) is (where, x = displacement)

None of these
 K dx/dt
 K d2x/dt2
 K *x

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Control Systems
For a unity feedback control system open loop transfer function then acceleration error constant is

 0.
 20.
 50.
 infinity.

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Control Systems
Which of the following is/are the advantages of a closed loop control system?

 The closed loop systems are less affected by noise.
 The closed loop systems are accurate.
 both 1 and 2.
 nether 1 nor 2.

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