Analog Electronics
Avalanche breakdown in a diode occurs when

  reverse bias exceeds a certain value.
  potential barrier is reduced to zero.
None of these
  forward electric current exceeds certain value.

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Analog Electronics
For an NPN transistor in normal bias

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

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