Final answer:
The voltage from Aø to Bø in a 120/240-volt 3-phase system should be approximately 208 volts, calculated as √3 × Phase Voltage. The provided options do not include this value, suggesting a possible typo in the question.
Step-by-step explanation:
The student's question pertains to the voltage between two phases in a 120/240-volt, 3-phase, 4-wire supply system. In such a system, the voltage between any two phases (Aø to Bø in this case) is what is known as the 'line voltage', which can be found using this relationship: Line Voltage = √3 × Phase Voltage.
Since the phase voltage is 120 volts, the line voltage would be √3 × 120 volts, which equals approximately 208 volts. However, as this option is not given, it seems there might be a typo in the question as typically in a 120/240 system, phase to phase should indeed be 208 volts. The closest option provided is B) 240 volts, but this would typically be the phase to neutral voltage in a high leg delta system, which is not standard. Therefore, with the given options, an exact answer cannot be determined without further clarification.