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

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

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Electronic Principles
Which one of the following statements is true for the currents in a parallel RL circuit?

None of these
The total current leads the total voltage by less than 90
The total current is less than the sum of the currents through the resistance and inductance
The total current is equal to the sum of the currents through the resistance and inductance
The current always has the same amplitude and phase for every part of the circuit

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Electronic Principles
The total inductance of a series inductor circuit is:

None of these
equal to the source voltage divided by total current
equal to the sum of the individual inductive-reactance values
less than the value of the smallest inductor
equal to the sum of the individual inductance values

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

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
Hysteresis is most apparent when a steady amount of current is lowing through the coil of an electromagnet
None of these
Hysteresis is most apparent when the current through the coil of an electromagnet changes frequently

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