Analog Electronics
The most commonly used transistor circuit arrangement is

  common emitter.
  common collector.
  common base.
None of these

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

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

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