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

None of these
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
Primary-cell batteries must be recharged at a much slower rate that secondary-cell batteries
Secondary-cell batteries can be recharged and used many times, whereas primary-cell batteries cannot be properly recharged
Primary-cell batteries can be recharged and used many times, whereas secondary-cell batteries cannot be properly recharged

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Electronic Principles
Which one of the following phrasers best describes flux density?

The opposition to a build-up of magnetic fields
The force that maintains lines of force
The rate of change of the number of lines of magnetic force
None of these
The concentration of lines of magnetic force

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

The current waveform for each component always has the same amplitude and phase as the applied current
All of these
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
None of these

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