NEIEP Mechanics Practice Exam

How many rectifiers does a three-phase, full-wave power supply utilize?

1. 4

2. 2

3. 6

4. 3

The correct answer is: 6

A three-phase, full-wave power supply uses six rectifiers to convert alternating current (AC) into direct current (DC). This setup is crucial for ensuring that each phase of the AC supply is effectively utilized, allowing for smoother and more efficient conversion and providing a stable output voltage. In a three-phase system, there are three distinct phase inputs, each contributing to the overall supply. A full-wave rectification approach allows for the conduction of current during both the positive and negative cycles of the AC waveform. By employing six rectifiers arranged in a specific configuration, each phase can be connected to two rectifiers. This means that each phase will provide three outputs during successive cycles, resulting in a continuous DC output with minimal ripple. The design of using six rectifiers enhances the performance of the power supply by distributing the load and improving efficiency, which is essential in industrial applications where high power levels and reliability are critical.