Electronic Principles
What is the smallest number of polarities required for current flow?

Three - negative, positive and neutral terminals
None of these
Two - a negative terminal and a positive terminal
One - a negative terminal
Four - two negative and two positive

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Electronic Principles
Which one of the following phrases best describes residual magnetism?

The circular magnetic field that surrounds a conductor carrying a current
The force of attraction between the poles of a permanent and temporary magnetic field
Magnetism that remains in the core of an electromagnet after the current through the coil is turned off
The amount of magnetic flux that is not confined to the core material of an electromagnet
None of these

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

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
The higher the amplitude of a waveform, the higher its frequency
The longer the period of a waveform, the lower its frequency
None of these

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

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

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