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
Increase in both input & output impedances
Decreases in both input & output impedances

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Analog Electronics
The magnitude of electric current ICBO

  depends largely upon the emitter doping.
  depends largely upon emitter-base junction base potential.
  is generally greater in silicon than in germanium transistor.
  increases with the increase in temperature.

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