Electronic Principles
A low-pass filter:

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

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

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
Unless specified otherwise, the frequency of a waveform is assumed to be 60 Hz
The actual frequency of a sine waveform is 1.41 times the working frequency

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Electronic Principles
Which one of the following phrases most accurately describes a purely capacitive circuit?

Capacitive reactance provides the only opposition to current flow
The ac voltage leads the current by 90 degree
Resistances provide the only opposition to current flow
None of these
Combinations of resistance and capacitive reactance provide any opposition to current flow

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