Analog Electronics
The β of a transistor is the ratio of the

  collect current to base current.
 collect current to emitter current.
 base current to collector current.
 emitter current to collector current.

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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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