Analog Electronics
When the current gain increases from 50 to 300 in an emitter-biased circuit, the collector current

 is zero.
 decreases by a factor of 6.
  remains almost the same.
 increases by a factor of 6.

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Analog Electronics
The common-source JFET amplifier has

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

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