Analog Electronics
The Barkhausen criterion for an oscillator

 Both A and C
 Loop gain should be unity
 The phase of a feedback signal with respect to input should be 0° or 360°
 Loop gain should be less than unity

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Analog Electronics
When a transistor is connected in common emitter mode, it with have

High input resistance and low output resistance
Medium input resistance and high output resistance
Negligible input resistance and high output resistance
Low input resistance as well as output resistance

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Analog Electronics
For an NPN transistor in normal bias

  Je is forward biased and Jc is reverse biased.
  only holes cross the collector junction.
  the emitter junction has high resistance.
  only majority carriers cross the collector junction.

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