Analog Electronics
The silicon transistor are more widely used than germanium transistors because

  they have larger electric current carrying capacity.
  they have smaller depletion layer.
  they have smaller leakage current.
  they have better ability to dissipate heat.

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

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

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