Electronic Principles
Norton's theorem replaces a complicated circuit facing a load by an

Ideal voltage source and parallel resistor
None of these
Ideal voltage source and series resistor
Ideal current source and series resistor
Ideal current source and parallel resistor

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

has no effect on the 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
cuts the current through the inductors one-half
doubles the amount of current through the inductors

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Electronic Principles
A low-pass filter:

has no effect on ac signals
passes lower-frequency signals and reduces higher-frequency signals
reduces the level of all frequencies by a significant amount
None of these
passes higher-frequency signals and reduces lower-frequency signals

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

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