Motor Plants & Auxiliary Boilers USCG Question #223 (Set 5)

The load is always placed on the lower half of the main bearings in a/an __________.

Official USCG Answer & Rule Citation

Correct Answer: Option A — two-stroke cycle engine

Two-stroke cycle engines experience continuous downward forces on the piston during both the power and scavenging strokes, ensuring the load remains permanently on the lower half of the main bearings. This eliminates the alternating bearing loads seen in four-stroke designs.

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