Suppose the photodetector of an optical tachometer detects a time interval of 0.05 seconds between the leading edges of the pulses created by the reflective stripe during shaft rotation. What is the rpm of the shaft?
Official USCG Answer & Rule Citation
Correct Answer: Option C — 1200 rpm
Under USCG National Maritime Center examination standards, the accepted correct answer is: 1200 rpm.
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