Analog Electronics
The collector characteristics of a common - emitter connected transistor may be used to find its

  output resistance .
  base current.
  input resistance.
  voltage gain.

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

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

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Analog Electronics
For transistor action

  all of these.
  the base region must be very thin and lightly doped.
  the emitter should be heavily doped.
  Je must be forward biased and Jc should be reverse biased.

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