Analog Electronics
The electric current ICBO flows in the

  emitter and base leads.
  collector and base leads.
  none of them.
  emitter and collector leads.

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Analog Electronics
In all base driver amplifiers

ac emitter voltage is 180° out of phase with ac base voltage
ac collector voltage is in phase with ac base voltage
ac collector voltage is 180° out of phase with ac base voltage
None of these

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