Analog Electronics
The load voltage is approximately constant when a zener diode is

  operating in breakdown region.
  reverse biased.
  unbiased.
  forward biased.

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

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