USCG USCG Motor
Set 12 • Question #96 of 382
Launch Interactive Practice Room What is the speed of the crankshaft in a four-stroke/cycle engine when the camshaft is turning at 750rpm?
A
375 RPM
B
500 RPM
C
750 RPM
D
1500 RPM
✓ Correct Answer
USCG NMC Regulatory Explanation
Crankshaft deflection readings (measured between crankweb punch marks at bottom, port, top, and starboard) verify engine bedplate alignment, foundation chocking integrity, and main bearing wear.
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