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

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

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Analog Electronics
For transistor action

  all of these.
  Je must be forward biased and Jc should be reverse biased.
  the base region must be very thin and lightly doped.
  the emitter should be heavily doped.

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