Analog Electronics
The arrow direction in diode symbol indicates

  none of these.
  opposite to the direction of hole flow.
  direction of hole flow.
  direction of electron flow.

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Analog Electronics
In all base driver amplifiers

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
ac emitter voltage is 180° out of phase with ac base voltage

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