Q1. It is known that pouring metal at a high rate into a mold can have certain disadvantages.Are there any disadvantages to pouring it very slowly? (10)Q2 Why does porosity have detrimental effects on the mechanical properties of castings?Would physical properties, such as thermal and electrical conductivity, also be adverselyaffected by porosity? Explain. (10)Q3. Pure aluminum is poured into a sand mold. The metal level in the pouring basin is 10 in.above the metal level in the mold, and the runner is circular with a 0.3-in. diameter. What is thevelocity and rate of the flow of the metal into the mold? (20)Q4. A sprue is 12 in. long and has a diameter of 3 in. at the top. The molten metal level in thepouring basing (which is much larger than the top of the sprue) is taken to be 3 in. from the topof the sprue for design purposes. If a flow rate of 30 in3/s is to be achieved, what should be thediameter at the bottom of the sprue? (20)Q5 What differences, if any, would you expect in the properties of castings made by permanentmold versus sand-casting processes? (10)Q6. What are the benefits to heating the mold in investment casting before pouring in themolten metal? Are there any drawbacks? (10)Q7. Draw a schematic of sand-casting mold showing various features. (20)
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