Electronic Principles
A high-pass filter:

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

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Electronic Principles
Which one of the following phrasers best describes flux density?

The opposition to a build-up of magnetic fields
The force that maintains lines of force
None of these
The rate of change of the number of lines of magnetic force
The concentration of lines of magnetic force

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Electronic Principles
The south pole of a magnet is the one:

None of these
that would be attracted to the earths north magnetic pole
that would be attracted to the earth's south magnetic pole
that has its molecules arranged in a random pattern
that would be repelled by the north pole of another magnet

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Electronic Principles
Doubling the operating frequency of a purely inductive circuit:

cuts the current through the inductors one-half
increases the current, but by an amount that can be determined only by doing a complete analysis of the circuit
None of these
doubles the amount of current through the inductors
has no effect on the current through the inductors

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