Electronic Principles
Doubling the diameter of the coil in an inductor:

reduces the value of inductance by one-half
multiplies the value of inductance by four
None of these
multiplies the value of inductance by two
reduces the value of inductance by one-fourth

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Electronic Principles
A low-pass filter:

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

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Electronic Principles
Waveforms are graphs that show:

amplitude on the vertical axis and the passage of time on the horizontal axis
amplitude on the vertical axis and frequency on the horizontal axis
frequency on the vertical axis and amplitude on the horizontal axis
the passage of time on the vertical axis and amplitude on the horizontal axis
None of these

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

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