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Control Systems

Control Systems
The open loop transfer function for unity feedback system is given by Find the steady state error for a ramp input of magnitude 10?

 infinite
 2
 0
 5

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Control Systems
Which of the following is/are the disadvantages of an open loop control system?

 Inaccurate.
 Unreliable.
 both 1 and 2.
None of these

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Control Systems
A second order control system is defined by the following equation: 4 d²c(t)/dt² + 8 dc(t)/dt + 16 c(t) = 16 u(t) The damping ratio and natural frequency for this system are respectively

 0.25 and 4 rad/s
 0.50 and 2 rad/s
 0.25 and 2 rad/s
 0.50 and 4 rad/s

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

 critically stable
 stable
 oscillatory
 unstable

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Control Systems
Time response for a second order system depends on the value of τ. If τ= 0 then the system is called as

  under damped system.
  over damped system.
  undamped system.
  critically damped system.

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Control Systems
The following transfer function represents a phase-lead compensator?

 (4s+2)/(6s+1)
 (s+4)/(3s+6)
 1/s
 (s+4)/(s+6)

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