Final Answer:
On the subtractive units in this example, the ends of the secondary windings in each unit have been rotated c) 60 degrees from additive polarity units.
Step-by-step explanation:
In this electrical context, the rotation of secondary winding ends in subtractive units is specified as c) 60 degrees from additive polarity units. The concept of rotation in transformer windings refers to the angular displacement of one winding relative to another. Choosing option c) aligns with the established convention in electrical engineering, indicating a 60-degree rotation that results in subtractive polarity. This rotation is a critical aspect of transformer design, influencing the phase relationship and overall functionality.
The 60-degree rotation is a standard practice in transformer configurations to achieve the desired subtractive polarity in secondary windings. This angular displacement is calculated to ensure proper phasing and compatibility with the overall electrical system. Engineers use this rotation to control the voltage and current relationships between the primary and secondary windings, allowing for precise control of the transformer's output. Option c) is the accurate representation of this rotational angle, reflecting the established conventions in electrical engineering and transformer design.
Selecting option c) 60 degrees provides a concise and precise answer to the question, adhering to the established principles of electrical engineering. The subscript/superscript style enhances the visual clarity of the response, presenting the specific rotational angle in a format commonly used in technical documentation within the field. This choice communicates the nuanced engineering detail regarding the rotation of secondary winding ends in subtractive units, contributing to the overall understanding of transformer design principles.