Electronic Principles
The knee voltage of a diode is approximately equal to the

Forward voltage
Breakdown voltage
None of these
Applied voltage
Barrier potential

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

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
None of these
has no effect on the current through the inductors
cuts the current through the inductors one-half

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