Electronic Principles
Which one of the following statements is true?

Power dissipation of a pure capacitor increases with operating frequency
None of these
Power dissipation of a pure capacitor decreases with operating frequency
All of these
There is no meaningful relationship between the power dissipation of a pure capacitor and its operating frequency

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

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

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Electronic Principles
A high-pass filter:

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

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Electronic Principles
The core of an electromagnet is said to be in saturation when:

changing the polarity of the current in the coil changes the polarity of the magnetic field around the core
the core is permitted to move freely within the coil
None of these
frequent changes in the direction of current through the coil causes heating effects in the core material
an increase in current through the coil causes no further increase in the mmf

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