Question 563Electricity & Electronics - Assistant Engineer

70% to pass

While standing an "at sea watch" onboard an AC diesel-electric drive ship with a synchronous propulsion motor, you notice that the kwatt load is at roughly 75% of capacity with a leading power factor less than 1. Ideally what would be the character of the power factor associated with the main power distribution including all motors?

Aunity
Bzero
Cleading
Dlagging
AI Explanation

The correct answer is A) unity. The power factor of the main power distribution, including all motors, should ideally be unity (1.0) for optimal efficiency and performance. With the synchronous propulsion motor operating at 75% capacity and a leading power factor less than 1, the system would benefit from adjusting the power factor to unity. The other options are incorrect because: B) zero power factor is not the ideal condition, as it would indicate a completely reactive load. C) leading power factor is not the ideal, as it can cause issues with voltage regulation and stability. D) lagging power factor is also not the ideal, as it can lead to increased power losses and reduced efficiency.

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Official Resources
46 CFR Electrical Engineering 46 CFR Machinery & Electrical USCG National Maritime Center
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