Analog Electronics
Avalanche breakdown in a diode occurs when

  forward electric current exceeds certain value.
None of these
  reverse bias exceeds a certain value.
  potential barrier is reduced to zero.

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

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

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