GATE 2021 IN – Question 60
A 3½-digit rectifier-type digital meter is on its 2000 V range. It measures a symmetrical 50 Hz square wave of amplitude ±100 V. Its reading is ______ V.
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Show answer and explanation
Correct answer: 111 to 111
Explanation
The meter senses the mean rectified voltage and multiplies by the sinusoidal form factor π/(2√2)≈1.11. For a ±100-V square wave, the mean of |v| is 100 V. The displayed sine-calibrated reading is therefore **111 V**, even though the square wave’s true RMS is 100 V.