Electronic Principles
The total impedance of a series RLC circuit:

is minimum at the resonant frequency
always increases as the applied frequency increases
None of these
always decreases as the applied frequency increases
is maximum at the resonant frequency

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Electronic Principles
Which one of the following phrases best describes residual magnetism?

The circular magnetic field that surrounds a conductor carrying a current
The amount of magnetic flux that is not confined to the core material of an electromagnet
The force of attraction between the poles of a permanent and temporary magnetic field
Magnetism that remains in the core of an electromagnet after the current through the coil is turned off
None of these

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

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

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

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