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 remains at one polarity but changes value 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

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Electronic Principles
Which one of the following statements applies to common auto batteries?

Auto batteries are primary wet-cell batteries
Auto batteries are secondary dry-cell batteries
None of these
Auto batteries are primary dry-cell batteries
Auto batteries are secondary wet-cell batteries

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Electronic Principles
In a pure inductor:

None of these
ac current leads the voltage by 90 degree
ac current lags the voltage by 90 degree
ac current and voltage are exactly in phase
ac current is converted to dc voltage

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