Electronic Principles
Which one of the following phrases most accurately describes a purely inductive circuit?

The ac voltage lags the current by 90 degree
Inductive reactance provides the only opposition to current flow
Combinations of resistance and inductive reactance provide any opposition to current flow
Resistances provide the only opposition to current flow
None of these

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

None of these
Primary-cell batteries must be recharged at a much slower rate that secondary-cell batteries
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
Secondary-cell batteries can be recharged and used many times, whereas primary-cell batteries cannot be properly recharged

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