Analog Electronics
Avalanche breakdown in a diode occurs when

  potential barrier is reduced to zero.
None of these
  forward electric current exceeds certain value.
  reverse bias exceeds a certain value.

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Analog Electronics
The common-source JFET amplifier has

  a high input impedance and a very high voltage gain.
  a very high input impedance and a relatively low voltage
  a high input impedance and a voltage gain less than 1.
  no voltage gain.

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