Electronic Principles
A low-pass filter:

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

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Electronic Principles
A farad is defined as the amount of capacitance necessary for:

changing the voltage on the plates at the rate of 1 V per second when 1 A of current is flowing
causing an ac phase shift greater than 90 degree
storing 1 V for 1 second
dissipating 1 W of power
None of these

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Electronic Principles
The total capacitive reactance of a parallel capacitor circuit is:

equal to the source voltage divided by total current
None of these
equal to the sum of the individual capacitive-reactance values
equal to the sum of the individual capacitance values
less than the capacitance value of the smallest capacitor

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