Analog Electronics
When a reverse bias is applied to a diode, it will

  increases the majority carrier an electric current greatly.
  lower the potential barrier.
  raise the potential barrier.
  none of these.

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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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Analog Electronics
The magnitude of electric current ICBO

  increases with the increase in temperature.
  depends largely upon the emitter doping.
  is generally greater in silicon than in germanium transistor.
  depends largely upon emitter-base junction base potential.

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