Which of the following is the preferred runner shape?

Understand the Problem

The question asks about runner shapes and which one is generally considered the best. It seems like the question might be related to manufacturing, engineering or a similar field where the design of runners is important. Runners are channels in molds that allow molten material to flow into the cavity.

More Information

Full round runners have the lowest pressure drop for a given volume of material, making them the most efficient.

Tips

While full round runners are the most efficient, they can be more expensive to manufacture due to machining and alignment requirements. Other shapes like trapezoidal or parabolic runners are sometimes preferred by designers and mold makers because of the reduced costs.

Sources

• Injection Molding Glossary - beaumontinc.com