Multiple choice

Among the following which one acts as a reservoir in metal casting mold to prevent cavities due to shrinkage?

  1. Pattern

  2. Flask

  3. Core

  4. Riser

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A riser, also known as a feeder, is a reservoir built into a metal casting mold to prevent cavities due to shrinkage. Most metals are less dense as a liquid than as a solid so castings shrink upon cooling, which can leave a void at the last point to solidify.