ISRO Electrical Engineering (EE) 2015 - Question 57

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The transient current in a loss free LC circuit when excited from an AC source results in ______ sine wave.

  • A. Under damped
  • B. Un damped
  • C. Over damped
  • D. Critically damped

Answer: B. Un damped

Explanation: A loss-free LC circuit has zero resistance (R = 0), so its characteristic roots lie purely on the imaginary axis (s = ±jω0), producing undamped, sustained harmonic oscillations.

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