Analog Electronics
The input stage of an op amp is usually a

  CE amplifier.
  swamped amplifier.
  differential amp.
  class B push-pull amplifier.

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Analog Electronics
The magnitude of electric current ICBO

  depends largely upon emitter-base junction base potential.
  increases with the increase in temperature.
  is generally greater in silicon than in germanium transistor.
  depends largely upon the emitter doping.

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