Electronic Principles
Current and voltage are said to be in phase when:

All of these
None of these
they have the same amplitude and frequency
their waveforms cross through zero and reach positive and negative peaks at the same time
their waveforms are both ac or both dc

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

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

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Electronic Principles
The total inductance of a series inductor circuit is:

less than the value of the smallest inductor
None of these
equal to the source voltage divided by total current
equal to the sum of the individual inductive-reactance values
equal to the sum of the individual inductance values

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