Question 261Electricity & Electronics - 1st Asst/Chief
70% to passWhile 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?
Azero
Bunity
Clagging
Dleading
AI Explanation
The correct answer is B) unity. The power factor of the main power distribution should be unity (1.0) for an AC diesel-electric drive ship with a synchronous propulsion motor. This is because synchronous motors can be operated at a unity power factor by adjusting the field current to maintain the desired power factor. The other options are incorrect because: A) zero power factor is not desirable, C) lagging power factor would indicate that the system is drawing more reactive power, and D) leading power factor, while better than lagging, is still not the ideal unity power factor.
Related Questions
Q@q.QuestionNumber:Why are external shunts sometimes used with ammeters? Q@q.QuestionNumber:What do the devices labeled "L" in Panel 2 of the illustrated switchboard repres... Q@q.QuestionNumber:As shown in figure "B" of the illustration, what is the purpose of the synchrono... Q@q.QuestionNumber:Modern ships use multiple computers arranged in a client/server network to perfo... Q@q.QuestionNumber:As shown in the illustrated switchboard, what is the function of the switch labe...
Ready to test your knowledge?
Take a Electricity & Electronics - 1st Asst/Chief Practice ExamOfficial Resources
Want to practice with timed exams?
Download Coast Guard Exams for the full exam experience.
Get the App