Analog Electronics
A quartz crystal oscillator consists of

 both series and parallel frequencies.
 only series resonant frequency.
 only parallel resonant frequency.
 neither series nor parallel frequency.

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Analog Electronics
Voltage Series (feedback also called series-shunt feedback) results in

Decreases in both input & output impedances
Increase in input impedance & decreases in output impedance
Increase in both input & output impedances
Decrease in input impedance & increase in output impedance

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