1.

Which of the following is not ac waveform?(a) sinusoidal(b) square(c) constant(d) triangular

Answer» The correct answer is (c) constant

Explanation: AC waveforms are those which periodically changes polarity with time.                                    Sinusoidal wave, square wave, triangular wave change their polarity at regular intervals so they are ac wavefoms. Constant wave doesnot change its polarity so it is not an ac waveform.


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