Analog Electronics
In a bipolar junction transistor the base region is made very thin so that

  recombination in base region is minimum.
  base can be easily fabricated.
  electric field gradient in base is high.
  base can be easily biased.

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

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