ARRT Practice Exam 2025 – Complete Study Guide for Radiologic Technologists

Question: 1 / 400

What does a half of the expected arc in three-phase equipment indicate?

Tube overloading

Rectifier failure

A half of the expected arc in three-phase equipment is indicative of rectifier failure. In three-phase systems, the operation relies on rectifiers to convert alternating current (AC) into direct current (DC). When a rectifier fails, it can no longer efficiently convert the input AC, leading to the production of a partial waveform. This partial waveform results in only a half of the expected arc, as the electrical current is not being effectively channeled through the system as designed.

In a properly functioning three-phase system, the rectifiers maintain the appropriate waveforms necessary for consistent performance and effective operation of the equipment. Therefore, the presence of half the expected arc serves as a signal of rectifier malfunction, emphasizing the importance of rectifiers in maintaining the integrity of the output current and overall equipment operation.

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Current leakage

Low voltage

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