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Control Systems

Control Systems
What is the order of a closed loop control system for a plant with a transfer function equal to G(s) = k/s²(1+Ts) and with unity feedback

 1
 0
 2
 3

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Control Systems
A unity feedback control system has forward loop transfer function as e-Ts/s(s+1). Its phase value will be zero at frequency ω1. Which of the following equations should be satisfied by ω1?

 ω1 = cot(Tω1)
 Tω1 = cot(ω1)
 Tω1 = tan(ω1)
 ω1 = tan(Tω1)

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Control Systems
Find the type of the system given by

 3.
 4.
 2.
 1.

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Control Systems
None of the poles of a linear control system lie in the right half of s plane. For a bounded input, the output of this system

  tends to zero.
  always bounded.
  could be unbounded.
  none of these.

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Control Systems
Time taken for the response to rise from zero to 100 % for very first time is called

 Peak time.
 Rise time.
 Settling time.
 Delay time.

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

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