Analog Electronics
For a diode, reverse recovery time is defined as the time between the instant diode current becomes zero and the instant reverse recovery current decays to

 15% of reverse peak current.
 10% of reverse peak current.
  25% of reverse peak current.
 0.

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

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