Analog Electronics
When the pn junction is forward biased the sequence of events that take place are

  none of above.
  injection, diffusion and recombination.
  diffusion, drift and recombination.
  diffusion, injection and drift.

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Analog Electronics
For transistor action

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

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