Analog Electronics
In a differential amplifier, the CMRR is limited mostly by the

  tolerance of the resistors.
  gain - bandwidth product.
  supply voltages .
  CMRR of the opamp.

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

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

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