An AC diesel-electric drive ship with...

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Question 1 of 2066636eed28f7522a1c51d2e9

An AC diesel-electric drive ship with synchronous propulsion motors has the capability for power factor correction. If the power factor associated with the main power distribution including all motors is unity (1.0). What statement is true?

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Question 1 of 20

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🔍 Key Concepts

• Synchronous motor excitation and power factor (under‑excited vs. over‑excited vs. normal excitation) • Relationship between leading/lagging reactive power (kVAR) and the overall power factor of the ship’s power system • What it means physically when the overall system power factor is unity (1.0)

💭 Think About

• For a synchronous motor, what kind of excitation (under, normal, or over) causes it to draw lagging, unity, or leading current? • If the ship’s overall power factor is exactly 1.0, what must the net reactive power (kVAR) in the system be? How can the synchronous motors contribute to this condition? • How is the term “power factor correction” usually achieved in AC systems, and what role does a synchronous motor’s excitation play in that correction?

✅ Before You Answer

• Identify which excitation condition makes a synchronous motor behave like a source of reactive power (leading PF) and which makes it a consumer of reactive power (lagging PF). • Confirm what unity power factor (1.0) implies about the total reactive power seen by the generators. • Make sure you distinguish between the power factor of an individual motor and the combined power factor of the whole distribution system, including correction.

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