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

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

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Analog Electronics
Conventional biasing of a BJT has

  EB forward biased and CB forward biased.
  EB reversed biased and CB forward biased.
  EB reversed biased and CB reversed biased.
  EB forward biased and CB reversed biased.

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