Analog Electronics
In CE configuration, the input V-I characteristics are drawn by taking

  VBE versus IB for constant value of VCE.
  VBE versus IB for constant value of IC.
  VBE versus IE for constant value of VCE.
  VCE versus IC for constant value of IE.

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

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