Analog Electronics
The most commonly used transistor circuit arrangement is

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

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

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

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