Electronic Principles
Which one of the following phrases best describes residual magnetism?

None of these
The amount of magnetic flux that is not confined to the core material of an electromagnet
Magnetism that remains in the core of an electromagnet after the current through the coil is turned off
The circular magnetic field that surrounds a conductor carrying a current
The force of attraction between the poles of a permanent and temporary magnetic field

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Electronic Principles
Waveforms are graphs that show:

the passage of time on the vertical axis and amplitude on the horizontal axis
None of these
amplitude on the vertical axis and the passage of time on the horizontal axis
amplitude on the vertical axis and frequency on the horizontal axis
frequency on the vertical axis and amplitude on the horizontal axis

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Electronic Principles
The total inductive reactance of a parallel inductor circuit is:

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

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Electronic Principles
Which one of the following is a statement of Kirchhoffs current law?

The algebraic sum of currents entering and leaving a point is equal to zero
The algebraic sum of currents in a loop is equal to zero
The total current in a parallel circuit is less than the value of the smallest current
None of these
The current through a resistance is proportional to the value of resistance and the IR drop across it

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