Analog Electronics
A small collector current with zero base current is caused by the leakage current of the

 emitter diode.
  collector diode.
 transistor.
 base diode.

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

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