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
D. Deliver the molten metal from pouring basin to gate
Answer: Option C
Solution(By Examveda Team)
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.
This Question Belongs to Mechanical Engineering >> Workshop Technology
Join The Discussion
Comments ( 3 )
Related Questions on Workshop Technology
The brass and bronze are welded by _________ flame.
A. Neutral
B. Oxidizing
C. Carburising
D. All of these
In TIG arc welding, the welding zone is shielded by an atmosphere of
A. Helium gas
B. Argon gas
C. Either (A) or (B)
D. None of these
In sheet metal blanking, shear is provided on punches and dies so that
A. Press load is reduced
B. Good cut edge is obtained
C. Warping of sheet is minimized
D. Cut blanks is straight
solid shrinkage and liquid shrunkage density of liquid is less than density of solid of molten metal so during solidification material will shrink is called nehative shrinkage
solid shrinkage and liquid shrunkage
positive shrinkage allowances in the cast iron