Analog Electronics
When the diode is forward biased, it is equivalent to

None of these
  an off switch.
  a high resistance.
  an on switch.

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Analog Electronics
The common-source JFET amplifier has

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

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