Discussion
A PMMC instrument is connected in a circuit fed with an AC signal of high frequency, the rms value of the AC signal is \(\sqrt{2}\) V. The PMMC instrument will read ______ V.
Answer: D
A permanent magnet moving coil instrument responds to the average value of the current through its coil. For a high-frequency AC signal the average over a cycle is zero, and also the moving system is too slow to follow the rapid changes, so the pointer stays at zero. The rms value of the signal, root 2 volt, does not matter. So the PMMC instrument reads 0 V, option (D). The values root 2, 2 and 1 would apply to an instrument that measures rms or peak values.
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