Analog Electronics
The following relationship between α and β are correct except

  1 - α = 1 / (1 + β).
  α = β / (1 + β).
  α = β / (1 - β).
  β = α / (1 - α).

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Analog Electronics
Pinch-off voltage in a JFET is

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

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