Analog Electronics
The encapsulation of transistor is necessary for

Preventing photo-emission effects
Mechanical ruggedness
Avoiding loss of free electrons
Preventing radio interference

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Analog Electronics
For transistor action

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

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