Analog Electronics
Feedback circuit in an oscillator can be accomplished by

 Any one or combinations of the above methods
 Resistive coupling between input and output
 Capacitive coupling between input and output
 Inductive coupling between input and output

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

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