Analog Electronics
Avalanche breakdown in a diode occurs when

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

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Analog Electronics
For an NPN transistor in normal bias

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

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