Electronic Principles
The period of a waveform is:

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

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Electronic Principles
Doubling the operating frequency of a purely inductive circuit:

None of these
cuts the current through the inductors one-half
has no effect on the current through the inductors
increases the current, but by an amount that can be determined only by doing a complete analysis of the circuit
doubles the amount of current through the inductors

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