While standing an "at sea watch" onboard an...

Question 1 / 2066636eed28f7522a1c51dbd0

Question 1 of 2066636eed28f7522a1c51dbd0

While standing an "at sea watch" onboard an AC diesel-electric drive ship with a synchronous propulsion motor with the ability to vary the field excitation strength and still remain in synchronism. Ideally what would be the character of the power factor associated with the main power distribution system including all motors?

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🔍 Key Concepts

• Power factor and its meaning in AC electrical systems • How synchronous motors can adjust reactive power by changing field excitation • What an engineer ideally wants for the overall ship service power factor on a diesel‑electric vessel

💭 Think About

• Think about what happens to power factor when a synchronous motor is over‑excited versus under‑excited. Which way (leading or lagging) does each condition push the system? • If you can freely adjust the field excitation and still stay in synchronism, what power factor condition would you try to achieve for the entire main power distribution system to minimize current and losses? • Among lagging, leading, zero, and unity power factor, which one is most desirable from the standpoint of generator loading and efficiency in normal operation?

✅ Before You Answer

• Be clear on the definition: power factor = real power (kW) / apparent power (kVA) and its maximum theoretical value • Recall whether unity power factor means no reactive power flow, and how that compares to ‘purely leading’ or ‘purely lagging’ conditions • Verify which option corresponds to the most efficient and desirable normal operating condition for shipboard generators when you have the ability to trim excitation.

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Question 1 of 20

lagging

leading

zero

unity

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Question 1 / 2066636eed28f7522a1c51dbd0

Question 1 of 2066636eed28f7522a1c51dbd0

Back

Question 1 of 20

66636eed28f7522a1c51dbd0

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

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