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The block diagram of a system with a proportional controller is shown below


A unit step is introduced in the set point. The value of K${_c}$ to provide a critically damped response for U = 0, $\tau{_p}$ = 8 and $\tau{_m}$ = 1 is

  1. 3.34
  2. 2.58
  3. 1.53
  4. 1.12
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