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

nicad cell
solar cell
photodiode
piezoelectric device
None of these

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Electronic Principles
A low-pass filter:

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

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Electronic Principles
The rms value of a sine waveform is:

equal to 1.41 times the peak amplitude
the number of cycles completed in one second
None of these
the time required to complete one full cycle
equal to 0.707 times the peak amplitude

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Electronic Principles
Which one of the following statements is true for current flowing in a parallel circuit?

None of these
The total current in a parallel circuit is always less than the smallest amount of current
The amount of current flow through each branch of a parallel circuit can be different, depending on the resistance of each branch part and the amount of voltage applied to it
The same current always flows through every part of a parallel circuit
The total current in a parallel circuit is equal to the total voltage multiplied by the total resistance

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