Analog Electronics
If the series resistance increases in an unloaded zener regulator, the zener current

  stays the same.
  increases.
  decreases.
  equals the voltage divided by the resistance.

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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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