Analog Electronics
The fact that there are many free electrons in a transistor emitter region means the emitter is

 undoped.
  heavily doped.
None of these
 lightly doped.

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

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

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