Investment casting uses ......... (wax / resin coated sand) as pattern material and is preferred for small parts with ................. (simple/intricate) designs

If the freezing ratio equal to (casting area/casting volume)/(riser area/riser volume) & the volumetric ratio equal to riser volume/casting volume, for a disc casting of $$20cm$$ diameter and $$10$$ $$cm$$ thick are $$1.4$$ and $$0.8$$ respectively. The corresponding values for a square disc of $$20$$ $$cm$$ side and $$10$$ $$cm$$ thick if the same cylindrical riser with a height to diameter ratio of unity is used in both cases.

Match the application with type of pattern

The type of coated electrode most widely used for welding low carbon steel is