In: Mechanical Engineering
7. Identify the three sources of contraction in a metal casting after pouring. 8. What is directional solidification and what is chill in casting? 9. Total solidification time is defined as (select one): (a) time between pouring and complete solidification, (b) time between pouring and cooling to room temperature, (c) time between solidification and cooling to room temperature, (d) time to give up the heat of fusion? 10. What is the difference between a pattern and a core in making sand casting mould? 11. What is function of riser? 12. What properties determine the quality of a sand mould for sand casting?