Electronic Principles
Which one of the following principles best describes the basic operation of an electromagnet?

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

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

Hysteresis is most apparent when the current through the coil of an electromagnet changes frequently
None of these
Hysteresis is most apparent when the core material is saturated
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

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Electronic Principles
Which one of the following phrasers best describes flux density?

The opposition to a build-up of magnetic fields
The concentration of lines of magnetic force
None of these
The rate of change of the number of lines of magnetic force
The force that maintains lines of force

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Electronic Principles
The peak value of a sine waveform is:

None of these
the amplitude at 70.7% of the maximum value
the amplitude at 1.41 times the maximum value
the maximum positive or negative value
the amplitude at 90% of the maximum value

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