Electronic Principles
An intrinsic semiconductor has some holes in it at room temperature. What causes these holes?

Free electrons
Thermal energy
Doping
Valence electrons
None of these

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Electronic Principles
A low-pass filter:

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

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

The total voltage of a parallel circuit is the same as the voltages across each branch
The total voltage in a parallel circuit is always less than the value of the smallest voltage
The total voltage in a parallel circuit is equal to the average value of the individual voltages
The total voltage is equal to the sum of the voltages across the individual branches in a parallel circuit
None of these

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