Electronic Principles
A low-pass filter:

has no effect on ac signals
None of these
reduces the level of all frequencies by a significant amount
passes higher-frequency signals and reduces lower-frequency signals
passes lower-frequency signals and reduces higher-frequency signals

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

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

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