Analog Electronics
A D - MOSFET can operate in the

  low - impedance.
  enhancement - mode only.
  depletion - mode only .
  depletion - mode or enhancement - mode.

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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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