Analog Electronics
Colpitts oscillator is also called as

 Tank circuit oscillator
All of these
 Resonant circuit oscillator
 LC oscillator

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

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