Electronic Principles
Which one of. the following phrases most accurately describes the nature of a pulsating dc voltage?

None of these
The voltage reverses polarity periodically
The voltage causes current to flow in two directions at the same time
The voltage remains at one polarity but changes value periodically
The voltage remains at one polarity and at a steady level

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Electronic Principles
Which one of the following statements most accurately applies to the frequency of a waveform?

The actual frequency of a sine waveform is 1.41 times the working frequency
Unless specified otherwise, the frequency of a waveform is assumed to be 60 Hz
The higher the amplitude of a waveform, the higher its frequency
None of these
The longer the period of a waveform, the lower its frequency

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