Q
Back pressure porosity can be avoided by________________?
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A
A. Using asbestos linear
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B
B. Placing the sprue at least one quarter inch away form the end of casting ring
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C
C. Preventing rapid heating the investment in burnout oven
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D
D. Using a short and wide sprue
Correct Answer:
B. B. Placing the sprue at least one quarter inch away form the end of casting ring
