Analog Electronics
The emitter of the transistor is generally doped the heaviest because it

  must possess low resistance.
  has to dissipate maximum power.
  is the first region of transistor.
  has to supply the charge carriers.

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Analog Electronics
Pinch-off voltage in a JFET is

 the drain voltage that gives infinite drain current.
 the drain voltage that gives zero drain current.
 the gate to source voltage that gives unity drain current.
 the gate to source voltage that gives zero drain current.

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