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

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

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Electronic Principles
Which one of the following phrases most accurately describes a purely inductive circuit?

None of these
The ac voltage lags the current by 90 degree
Combinations of resistance and inductive reactance provide any opposition to current flow
Resistances provide the only opposition to current flow
Inductive reactance provides the only opposition to current flow

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Electronic Principles
The rms value of a sine waveform is:

None of these
the time required to complete one full cycle
the number of cycles completed in one second
equal to 1.41 times the peak amplitude
equal to 0.707 times the peak amplitude

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