Analog Electronics
The value of total collector electric current in a CB circuit is

  IC = αIE - ICO.
  IC = αIE.
  IC = βIE.
  IC = αIE + ICO.

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Analog Electronics
Pinch-off voltage in a JFET is

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

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