Electronic Principles
The period of a waveform is:

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

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Electronic Principles
Which one of the following statements best describes magnetic hysteresis?

None of these
Hysteresis is most apparent when the current through the coil of an electromagnet changes frequently
Hysteresis is most apparent when a steady amount of current is lowing through the coil of an electromagnet
Hysteresis is the amount of magnetic flux that is not confined to the core material of an electromagnet
Hysteresis is most apparent when the core material is saturated

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Electronic Principles
Which one of the following principles best describes the basic operation of a generator?

Like magnetic poles repel; unlike poles attract
Current flowing through a conductor generates a magnetic field
None of these
Like magnetic poles attract; unlike poles repel
Current is induced in a conductor that is moving through a magnetic field

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