Solution:

Significance of Gating system in casting process: The term gating system refers to all passageways through which the molten metal passes to enter the mold cavity.

It provides continuous, uniform feed of molten metal, with as little turbulence as possible to the mould cavity. It supplies the casting with liquid metal at best location to achieve proper directional solidification and optimum feeding of shrinkage cavities.

It fills the mould cavity with molten metal in the shortest possible time to avoid temperature gradient. It provides with a minimum of excess metal in the gates and risers. Inadequate rate of metal entry, on the other hand, will result many defects in the casting. It prevents erosion of the mould walls. It prevents slag, sand and other foreign particles from entering the mould.