Question

While cooling, a cubical casting is the side 40 mm undergoes 3%, 4% and 5% volume shrinkage during the liquid state, phase transition and solid state, respectively. The volume of metal compensated from the riser is

• A. 9%
• B. 2%
• C. 8%
• D. 7%

Answer 1

The correct option is D 7%

The volume of metal compensated by a riser does not constitute cooling during solid state. Riser can compensate for volume shrinkage only in the liquid stage and transition stage.

$\therefore \text{Volume compensated by riser = 3 + 4 = 7\%}$