Analog Electronics
When testing an npn transistor using an ohmmeter, the collector-emitter resistance will be low when

  the transistor is defective.
 the transistor is normal.
 the emitter is positive in respect to the collector.
 the collector is positive in respect to the emitter.

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Analog Electronics
In all base driver amplifiers

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