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

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

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Analog Electronics
In an OP-amp differentiator

The amplitude of output is proportional to input
The amplitude of output is proportional to rate of change of input
Polarity of input and output is the same
Output occurs when input is finite and constant

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