In figure "4" of the diagram shown in the...

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Question 1 of 205eccefa4bacbc34ba4d48106

In figure "4" of the diagram shown in the illustration, the three phase step down power transformer has a turns ratio of four to one. If a three-phase 440 volt supply is connected to terminals 'A1-B1-C1', what voltage should develop across terminals 'A2-B2-C2'? See illustration EL-0084.

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Question 1 of 20

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🔍 Key Concepts

• Transformer turns ratio and how it affects primary vs. secondary voltage • Whether the windings at A1‑B1‑C1 and A2‑B2‑C2 in figure 4 are connected line‑to-line (delta) or line‑to-neutral (wye) • Relationship between line voltage and phase voltage in three‑phase wye and delta systems

💭 Think About

• First, decide if the 440 V given is a line voltage or phase voltage in this connection, based on how A1‑B1‑C1 are drawn in figure 4. • Next, use the 4:1 turns ratio to find the secondary phase voltage from the primary phase voltage. • Finally, convert the secondary phase voltage to line voltage (or vice‑versa) as required by the way A2‑B2‑C2 are connected, and then compare to the answer choices.

✅ Before You Answer

• Confirm whether both primary and secondary are wye‑connected, both delta‑connected, or one wye/one delta in figure 4. • Check that you are applying the turns ratio to the phase voltage, not directly to the wrong quantity (line voltage in the wrong configuration). • Verify your final number against the multiple‑choice options; it should be close to your calculated secondary line voltage across A2‑B2‑C2.

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