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

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

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

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

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Electronic Principles
Which one of the following statements is true for the voltages in a series RC circuit?

The voltage always has the same amplitude and phase for every part of the circuit
The total voltage is equal to the sum of the voltages across the resistance and capacitance
The total voltage is greater than the sum of the voltages across the resistance and capacitance
The total voltage is less than the sum of the voltages across the resistance and capacitance
None of these

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