Analog Electronics
The voltage divider biasing circuit is used in amplifiers quite often because it

  makes the operating point almost independent of β.
  reduces the cost of the circuit.
  reduces the DC base electric current.
  limits the AC signal going to base.

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Analog Electronics
Pinch-off voltage in a JFET is

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

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