How is the main propeller shaft rotation of a rectified DC diesel-electric drive normally reversed?
Official USCG Answer & Rule Citation
Correct Answer: Option A — reversing the field polarity in the DC motor
Reversing main propeller shaft rotation in a DC diesel-electric drive is achieved by reversing the armature or field polarity in the DC motor via control circuits. Per IEEE 45 standards, this alters current direction through the motor windings, changing rotation smoothly.
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