NEIEP Mechanics Practice Exam

Which of the following rectified power supplies is known for being the most efficient?

1. Single-phase, Half-Wave

2. Three-phase, Full-Wave

3. Single-phase, Full-Wave

4. Three-phase, Half-Wave

The correct answer is: Three-phase, Full-Wave

The three-phase, full-wave rectified power supply is recognized for its high efficiency due to several key factors. First, a three-phase system uses three separate AC sources, which means it can deliver power more consistently and smoothly than single-phase supplies. This results in a more continuous output with less ripple voltage, leading to improved efficiency in energy conversion. Second, the full-wave rectification process in this type of power supply utilizes both the positive and negative halves of the AC waveform, allowing it to make use of the entire input signal. This contrasts with half-wave rectification, which only captures one half of the waveform, wasting energy and producing more ripple. Additionally, three-phase full-wave rectifiers typically have lower losses in the diodes or transistors because they conduct more efficiently during a greater portion of the cycle. As a result, these systems can handle higher loads while generating less heat, which enhances overall performance and longevity. Because of these characteristics, the three-phase, full-wave rectified power supply stands out as the most efficient option in the context of power conversion and electrical supply systems.