Analog Electronics
When the two input terminals of a differential amplifier are grounded

  the base currents are equal.
  an output error voltage usually exists.
  the collector currents are equal.
  the ac output voltage is zero.

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

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

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