As shown in the illustration, by what means are all the 'MS' contacts are opened and closed? EL-0073
Official USCG Answer & Rule Citation
Correct Answer: Option D — manual operation of the master switches
The 'MS' master switch contacts are mechanically actuated directly by operator manipulation of the master switch handle, directing control power without relying on solenoid coils, magnets, or auxiliary relays for their immediate physical positioning.
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