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An autotransformer is particularly advantageous when it comes to its design and performance characteristics, and the reason for this choice pertains to its ability to efficiently provide multiple secondary taps at low transformation ratios.

In an autotransformer, a single winding serves both as the primary and the secondary, allowing for various output voltages to be tapped from the same winding. This flexibility enables the use of many secondary voltage levels in a compact and efficient manner, making it ideal for applications that require a range of voltages without the need for multiple separate transformers.

Additionally, the reduced number of turns needed when compared to a conventional transformer for lower transformation ratios leads to increased efficiency and cost-effectiveness. This is particularly beneficial in applications where space and weight are key considerations, as well as in preventing unnecessary losses that would arise from using multiple transformers for different output voltages.

These advantages highlight why an autotransformer is preferred in scenarios necessitating various secondary taps combined with low ratios, capturing the essence of its operational efficiency and functionality in electrical systems.