Analog Electronics
The most commonly used transistor circuit arrangement is

  common emitter.
  common base.
  common collector.
None of these

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Analog Electronics
The arrowhead on the transistor symbol points in the direction of

  minority carrier flow in the emitter region.
  electron flow in the emitter region.
  majority carrier flow in the emitter region.
  conventional electric current flow in the emitter region.

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