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.
63) The purpose of a riser is to
Answer is:
feed the molten metal to the casting in order to compensate for the shrinkage
Explanation:
Related Workshop Technology MCQ with Answers
Answer is:
all of these
Explanation:
Cores are used to Form internal cavities in the casting and Improve mould surfaceand used to Form a part of a green sand mould.
core is a device used in casting and moulding processes to produce internal cavities and reentrant angles .
The core is normally a disposable item that is destroyed to get it out of the piece
Answer is:
drop core
Explanation:
When a hole or cavity to be cored is not in line with the parting surface, then a drop core is used.
Answer is:
steel
Explanation:
Steel will require the largest size of riser for the same size of casting.
Answer is:
chills and padding
Explanation:
A chill is an object used to promote solidification in a specific portion of a metal casting mold. The directional solidification in casting can be improved by using Chills and padding.