Analog Electronics
Pinch-off voltage in a JFET is

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

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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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