As shown in the illustration, what is the...

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Question 1 of 205eccefa4bacbc34ba4d48171

As shown in the illustration, what is the purpose of the second set of primary windings (PRI.2) of the static excitation transformer of the compounded self-excited alternator? See illustration EL-0079.

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🔍 Key Concepts

• Role of compounding in a self-excited alternator and what it is trying to correct as load increases • Difference between the base/no-load excitation (usually from one primary winding) and the load‑sensitive excitation (from another primary winding) • How excitation must change (increase or decrease) as real load current increases in order to keep terminal voltage approximately constant

💭 Think About

• Look at how PRI.1 and PRI.2 are each connected in the diagram. Which one appears to be tied directly to the stator output for normal excitation, and which one is arranged so that its effect depends on the load current? • If the alternator’s terminal voltage tends to drop as load current increases, should the additional excitation from PRI.2 increase with load, decrease with load, or stay the same to compensate for that drop? • Which choices clearly describe a "no‑load" function, and which describe an "additional" excitation that responds to load changes?

✅ Before You Answer

• Identify which primary winding is responsible for no‑load excitation versus load‑dependent excitation • Decide whether proper voltage regulation requires excitation to change in the same direction or opposite direction as the load current • Eliminate any option that suggests PRI.2 only smooths transients or only provides the basic no‑load excitation, since its label and placement indicate a compounding (load‑sensing) role

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