Analog Electronics
The magnitude of electric current ICBO

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

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

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