Analog Electronics
Thermal runaway is not possible in FET because as the temperature of FET increases

The drain current increases
The mobility decreases
None of these
The transconductance increases

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Analog Electronics
The common-source JFET amplifier has

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

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