Assuming that 450 VAC is the source voltage...

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Question 1 of 205eccefa4bacbc34ba4d48522

Assuming that 450 VAC is the source voltage at the circuit breaker, if 450 volts AC were measured across the load as shown in figure "B" of the illustration, what would this indicate? Illustration EL- 0083

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🔍 Key Concepts

• Autotransformer operation with tapped windings (25%, 50%, 75%) • What voltage the load is supposed to see when connected to a tap vs. across the full winding • Effect of an open winding segment on how much of the source voltage appears across the load

💭 Think About

• In figure B, trace the path of the load terminals: are they connected across the entire winding (X to Y) or only part of it when everything is normal? • If a section of the autotransformer winding opens, does the load end up connected to a smaller portion of the winding, the full winding, or possibly isolated? How would each case affect the measured load voltage? • Which single fault listed in the choices would cause the load to see the same 450 VAC as the source, instead of a reduced tap voltage?

✅ Before You Answer

• Determine what normal load voltage should be with the tap connection shown (less than 450 V or equal to 450 V?). • Identify which connections would make the load effectively sit directly across X and Y, bypassing the tap section you intended to use. • Confirm that the option you pick actually creates a condition where the voltmeter would read full source voltage (450 VAC) at the load terminals.

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