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

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

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Electronic Principles
One henry of inductance is defined as:

the amount of counter emf required to reduce a current to 1 A
the number of turns of wire in an inductor multiplied by the amount of current flowing through it
the amount of inductance required for generating 1 V of counter emf when the current changes at the rate of 1 A per second
None of these
the amount of inductance required to change the frequency of a current by 1 Hz

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