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

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

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

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

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