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

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

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Analog Electronics
In all base driver amplifiers

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

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