Q16
The purpose of a riser is to
A.
Deliver molten metal into the mould cavity
B.
Act as a reservoir for the molten metal
C.
Feed the molten metal to the casting in order to compensate for the shrinkage
AnswerD.
Deliver the molten metal from pouring basin to gate
Answer: Option C
Solution
Answer: Option C
Solution:
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.