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

chemical cell
thermocouple
piezoelectric devices
solar cell
None of these

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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
reduces the level of all frequencies by a significant amount
None of these
has no effect on ac signals

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Electronic Principles
The rms value of a sine waveform is:

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

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Electronic Principles
Which one of the following is a statement of Kirchhoffs current law?

The algebraic sum of currents in a loop is equal to zero
The current through a resistance is proportional to the value of resistance and the IR drop across it
None of these
The algebraic sum of currents entering and leaving a point is equal to zero
The total current in a parallel circuit is less than the value of the smallest current

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Electronic Principles
Which one of the following statements best applies to a series RLC circuit?

None of these
The current waveform for each component always has the same amplitude and phase as the applied current
The voltage waveform for each component always has the same amplitude and phase as the applied voltage
The sum of the current is always less than the applied current
All of these

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