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

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

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Analog Electronics
When a transistor is connected in common emitter mode, it with have

Medium input resistance and high output resistance
Low input resistance as well as output resistance
Negligible input resistance and high output resistance
High input resistance and low output resistance

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