Electronic Principles
A device that converts mechanical pressure to electrical energy is called a:

None of these
nicad cell
solar cell
photodiode
piezoelectric device

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Electronic Principles
What is the difference between a conductor and an insulator?

None of these
The difference between conductors and insulators depends on how they are used
An insulator has an excessive number of free electrons, while a conductor has a few free electrons or none at all
A conductor allows current to flow much easier than an insulator does
An insulator allows current to flow much easier than a conductor does

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Electronic Principles
A low-pass filter:

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

The ac voltage leads the current by 90 degree
None of these
Combinations of resistance and capacitive reactance provide any opposition to current flow
Resistances provide the only opposition to current flow
Capacitive reactance provides the only opposition to current flow

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