GATE EE 2014 Set 2 — Question 29
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Electrical & Electronic Measurements → AC Power & Three-Phase → PMMC & Moving Iron
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Question
The saw-tooth voltage waveform shown in the figure is fed to a moving iron voltmeter. Its reading would be close to _____________
Correct answer
56 to 59
Solution
A moving iron voltmeter measures the Root Mean Square (RMS) value of the input voltage. For a periodic saw-tooth waveform with a peak value , the RMS value is given by:From the figure, the peak voltage V. Thus, the reading of the voltmeter is approximately 57.74 V, which falls within the range of 56 to 59.
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