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R.M.S value of the periodic square waveform of amplitude 72 V.

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R.M.S value of the periodic square waveform of amplitude 72 V.

(a) 72 V

(b) 56 V

(c) 12 V

(d) 33 V

I got this question in an international level competition.

Query is from Induction Motors Speed Control in portion Speed Control of Direct Current Motors & Induction Motors of Electric Drives

1 Answer

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Right choice is (a) 72 V

To explain I would say: R.M.S value of the periodic square waveform is Vm and r.m.s value of the trapezoidal waveform is Vm÷3^½. The peak value of the periodic square waveform is Vm.

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