Electronic Principles
What are the main parts of an atom?

Electrons, protons, and ions
Protons only
Electrons, ions, and neutrons
Electrons, protons, and neutrons
None of these

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Electronic Principles
A low-pass filter:

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

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Electronic Principles
Which one of the following phrases most accurately describes a purely inductive circuit?

Resistances provide the only opposition to current flow
Combinations of resistance and inductive reactance provide any opposition to current flow
Inductive reactance provides the only opposition to current flow
The ac voltage lags the current by 90 degree
None of these

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Electronic Principles
The period of a waveform is:

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

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Electronic Principles
What is a free electron?

An electron that has no electrical charge
An electron that costs nothing
An electron that has twice the amount of charge of a normal electron
An electron that has been freed from its parent atom
None of these

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