Electronic Principles
For a pure capacitor:

None of these
ac current and voltage are exactly in phase
ac current is converted to dc voltage
ac current leads the voltage by 90 degree
ac current lags the voltage by 90 degree

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Electronic Principles
What is the primary difference between primary and 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 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
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 most accurately describes the nature of inductive reactance?

Inductive reactance is a force that tends to overcome the effects of counter emf
Inductive reactance is an opposition to current flow in dc circuits
Inductive reactance is another term for counter emf
None of these
Inductive reactance is an opposition to current flow in ac circuits

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