Analog Electronics
For transistor action

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

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Analog Electronics
The ICBO is the electric current that flows when some DC voltage is applied

  in the forward direction to the emitter junction with collector open.
  in the reverse direction to the collector junction with emitter open.
  in the reverse direction to the emitter junction with collector open.
  in the forward direction to the collector junction with emitter open.

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Analog Electronics
The magnitude of electric current ICBO

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

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