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An average responding multimeter is used on a square wave of 10 V peak. It will read about

  • A.10 V
  • B.7.07 V
  • C.9 V
  • D.11.1 V

Answer: D

The rectified mean of the square wave is its peak, ten volts, and the instrument multiplies by 1.11 on the assumption of a sinusoid. The true rms value is ten volts, so the reading is eleven per cent high, and a true rms instrument would report it correctly.

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