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

Auto batteries are secondary dry-cell batteries
Auto batteries are primary wet-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
A low-pass filter:

passes lower-frequency signals and reduces higher-frequency signals
reduces the level of all frequencies by a significant amount
has no effect on ac signals
passes higher-frequency signals and reduces lower-frequency signals
None of these

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