Ceramic slurry is used in making the molds for

The optimum pouring time for a casting depends on several factors. One important factor among them is

Low permeability molds and low pouring temperature of the molten metal causes ......................... defect in castings.

The problem of shrinkage cavity is more likely to occur while casting ......... A ............ B.......... a chill block

(A.) metal / plastic , (B.) with / without.