Analog Electronics
In modern the MOSFET, the material used for the gate is

  high - purity silicon.
  high - purity silica.
  epitaxially grown silicon.
  heavily doped poly crystalline silicon.

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Analog Electronics
For transistor action

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

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