Analog Electronics
The following are the necessary requirements of an oscillator

 Both A and B
 Amplitude stability
 Frequency stability
 Power stability

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Analog Electronics
Pinch-off voltage in a JFET is

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

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