Electronic Principles
A low-pass filter:

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

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

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

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Electronic Principles
The period of a waveform is:

None of these
the time required to complete one full cycle
the time required for the voltage to rise from 10% to 90% of the peak amplitude
the number of cycles completed in one second
equal to 0.707 times the peak amplitude

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