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- Assistant Engineer (Motor Plants (OSV)) »
- Q654 - Electrical, Electronic, & Control Engineering
63. Which of the illustrated motors has an open motor enclosure
Choice B is correct; it is the only motor with windings and rotor fully exposed through large openings, defining an open motor enclosure. Other options have solid frames, limited ventilation, or enclosed housings, indicating totally enclosed or drip-proof designs. An open enclosure is characterized by unobstructed access to the internal components.
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