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

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

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

Primary-cell batteries must be recharged at a much slower rate that secondary-cell batteries
None of these
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
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

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

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

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