Discussion
Which measurement detects a failed diode in the rectifier?
Answer: D
A meter on its alternating current range should read only a few tens of millivolts, and a failed diode raises it sharply. An oscilloscope shows the missing peak directly and is the better tool, which makes the last option a real and superior method. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Tracing the requirement back to the physical constraint that produces it makes the answer follow.
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