Analog Electronics
The common-source JFET amplifier has

  a very high input impedance and a relatively low voltage
  a high input impedance and a very high voltage gain.
  a high input impedance and a voltage gain less than 1.
  no voltage gain.

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

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

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