The component shown in the illustration, labeled "IV", is the __________. SE-0013
Official USCG Answer & Rule Citation
Correct Answer: Option A — bull gear
In double-reduction marine propulsion gear trains, the large final bull gear receives torque from the low-speed pinions and directly drives the main shaft line. Labeled component "IV" represents this massive main reduction gear, essential for turning high-torque propeller revolutions.
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