Electronic Principles
At room temperature an intrinsic semiconductor has

many holes
None of these
No holes
a few free electrons and holes
many free electrons

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Electronic Principles
The total capacitive reactance of a parallel capacitor circuit is:

equal to the source voltage divided by total current
None of these
less than the capacitance value of the smallest capacitor
equal to the sum of the individual capacitance values
equal to the sum of the individual capacitive-reactance values

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Electronic Principles
What is the primary difference between primary and secondary cell batteries?

Primary-cell batteries use chemical cells, whereas secondary-cell batteries use an alternative energy source, such as thermal or magnetic energy, to supplement their outputs
Secondary-cell batteries can be recharged and used many times, whereas primary-cell batteries cannot be properly recharged
None of these
Primary-cell batteries can be recharged and used many times, whereas secondary-cell batteries cannot be properly recharged
Primary-cell batteries must be recharged at a much slower rate that secondary-cell batteries

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Electronic Principles
Which one of. the following phrases most accurately describes the nature of a pulsating dc voltage?

The voltage causes current to flow in two directions at the same time
The voltage reverses polarity periodically
None of these
The voltage remains at one polarity but changes value periodically
The voltage remains at one polarity and at a steady level

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