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Control Systems

Control Systems
The unit step error coefficient of a system with unity feedback is

 infinity.
 0.
 1/6.
 1.

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Control Systems
Find the stability for the following transfer function G(s) = 50/s(s+5) ?

 Marginally stable
 Critically stable
 Stable
 Unstable

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Control Systems
The transfer function of a plant is T(s) = 5/(s+5)(s² + 5 + 1). The second order approximation of T(s) using dominant pole concept is

 1/(s+1)(s+5)
 5/(s+1)(s+5)
 1/(s² + 5 + 1)
 5/(s² + 5 + 1)

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Control Systems
A linear time invariant system has an impulse response e2t for t > 0 . If initial condition are 0 and input is e3t, the output for t > 0 is

  e2t - e3t.
  e2t + e3t.
  e3t - e2t.
  e5t.

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Control Systems
The impulse response of a linear system is e-t, (t > 0). The corresponding transfer function is

 s/(s+1)
 1/s(s+1)
 1/(s+1)
 1/s

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Control Systems
Time constant is defined as the time taken by the response of the system to reach ----------- ?

 50% of the final value
 100% of the final value
 63% of the final value
 70.7% of the final value

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