Analog Electronics
The input voltage to an emitter follower is usually

  less than the generator voltage.
 equal to the supply voltage.
 greater than the generator voltage.
 equal to the generator voltage.

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Analog Electronics
For transistor action

  the base region must be very thin and lightly doped.
  all of these.
  Je must be forward biased and Jc should be reverse biased.
  the emitter should be heavily doped.

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Analog Electronics
The common-source JFET amplifier has

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

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