A diesel engine with a full speed of 1000 RPM drives a propeller at 300 RPM. What is the speed reduction ratio?
Official USCG Answer & Rule Citation
Correct Answer: Option B — 3.33 to 1
Speed reduction ratio is calculated by dividing input crankshaft RPM by output propeller RPM (1000 divided by 300), yielding a reduction ratio of 3.33 to 1.
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