Electronic Principles
The period of a waveform is:

the number of cycles completed in one second
equal to 0.707 times the peak amplitude
the time required to complete one full cycle
the time required for the voltage to rise from 10% to 90% of the peak amplitude
None of these

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

The actual frequency of a sine waveform is 1.41 times the working frequency
None of these
The longer the period of a waveform, the lower its frequency
The higher the amplitude of a waveform, the higher its frequency
Unless specified otherwise, the frequency of a waveform is assumed to be 60 Hz

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

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
The circular magnetic field that surrounds a conductor carrying a current
None of these
The force of attraction between the poles of a permanent and temporary magnetic field

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Electronic Principles
A high-pass filter:

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

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