Analog Electronics
A JFET can operate in

  depletion and enhancement mode only.
  none of these.
  depletion mode only.
  enhancement mode only.

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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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