The design Power Factor (PF) of a vessel's...

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Question 1 of 205eccefa4bacbc34ba4d480f4

The design Power Factor (PF) of a vessel's electrical system is generally 0.8 - 0.9. The system's greatest load is inductive. One notices a slow, gradual decrease, over time, in the PF, from normal/design. What can one do on board to maintain the normal, design PF and thus maintain electrical system's efficiency?

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🔍 Key Concepts

• Power factor (PF) in AC electrical systems and what causes it to drop below 1.0 • Behavior of inductive loads (motors, transformers) and their relationship to reactive power (lagging current) • How capacitive and resistive loads each affect power factor and system efficiency

💭 Think About

• When the majority of loads are inductive, is the current typically leading or lagging the voltage, and how does that influence PF? • Which type of added load (capacitive or resistive) is commonly used in industry to correct a lagging power factor caused by motors? • Would changing system frequency be a practical on‑board method, and is it normally adjustable on shipboard power systems?

✅ Before You Answer

• Clarify whether a vessel’s generators/frequency are normally fixed or variable in normal operation • Review how capacitors vs resistors affect reactive power and whether they increase or decrease PF in a lagging system • Confirm that just ensuring motors run at design load does not directly correct a steadily worsening PF caused by inductive loads over time

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