To overcome the problems like blow holes in casting
109. Dental castings and turbine blades are produced by a. Centrifugal casting b. Investment casting c. Die casting d. Sand casting (Ans:b) 110. The slurry in Plaster mould casting consists of a. 100 parts of plaster and 160 parts of water b. 130 parts of plaster and 120 parts of water c. 110 parts of plaster and 150 parts of water d. 150 parts of plaster and 110 parts of water (Ans:a) 111.
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