Back pressure porosity can be avoided by________________?

A.\tUsing asbestos linear

B.\tPlacing the sprue at least one quarter inch away form the end of casting ringCorrect Answer

C.\tPreventing rapid heating the investment in burnout oven

D.\tUsing a short and wide sprue

Correct Option: B.\tPlacing the sprue at least one quarter inch away form the end of casting ring

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