Electronic Principles
What is a negative ion?

An atom that contains more electrons than protons
An atom that contains more protons than neutrons
None of these
An atom that contains more electrons than neutrons
An atom that contains more protons than electrons

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Electronic Principles
A low-pass filter:

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

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Electronic Principles
The total impedance of a parallel RLC circuit:

always decreases as the applied frequency increases
is equal to the sum of the values of resistance, inductive reactance and capacitive reactance
always increases as the applied frequency increases
is maximum at the resonant frequency
None of these

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

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