ISRO Electrical Engineering (EE) 2017 - Question 2

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The square waveform of current has following relation between r.m.s value and average value

  • A. r.m.s. value of current is greater than the average value
  • B. r.m.s. value of current is less than the average value
  • C. r.m.s. value of current is equal to the average value
  • D. There is no definite relation between the r.m.s. value and average value for a square wave

Answer: C. r.m.s. value of current is equal to the average value

Explanation: For a symmetrical square wave of amplitude Im, |i(t)| = Im at all times, so Irms = Iavg = Im.

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