Which of the following are common types of machine-sewed seams?

The choice referring to plain overlap, folded-fell, and French-fell represents common types of machine-sewed seams that are frequently used in various sewing applications, including garment construction and industrial sewing.

Plain overlap seams involve laying one piece of fabric over another and sewing through both layers, creating a simple yet effective join. This type is often used for basic seam constructions, where visibility and bulk are not concerns.

Folded-fell seams are particularly strong and durable, as they encase the raw edges of the fabric within the folded hem, which prevents fraying while also providing a clean finish. This method is commonly used in heavy-duty fabrics and has applications in both clothing and upholstery.

French-fell seams are known for their neat and enclosed finish, making them suitable for lightweight and delicate fabrics. This type of seam involves folding the raw edges inward before sewing, which results in a polished look and further prevents fraying.

Combining these three seam types illustrates a range of techniques that ensure strength and aesthetics in sewn products, which is why this option is identified as correct. Each of these seams serves specific functions based on the type of fabric and the desired durability, showcasing the versatility and various applications of machine-sewing techniques.