Question

Calculate the value measured by PMMC when a sinusoidal voltage signal is applied to it.

(a) 15 V

(b) 0 V

(c) 16 V

(d) 18 V

I had been asked this question by my college director while I was bunking the class.

The origin of the question is Electric Traction Services topic in section Traction Drives of Electric Drives

Answer 1

Right option is (b) 0 V

The best I can explain: PMMC instrument measures the average of the input signal. The sinusoidal voltage signal is symmetric about the origin. The average value measured by PMMC is zero.