Analog Electronics
Pinch-off voltage in a JFET is

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

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Analog Electronics
When a transistor is connected in common emitter mode, it with have

Low input resistance as well as output resistance
Negligible input resistance and high output resistance
Medium input resistance and high output resistance
High input resistance and low output resistance

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