Analog Electronics
In a nonlinear op-amp circuit, the

  output shape is the same as the input shape.
  opamp may saturate.
  feedback loop is never opened.
  opamp never saturates.

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Analog Electronics
In all base driver amplifiers

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

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