Q. The defect blow hole in castings is caused due to (Solved)
1. Hard ramming
2. Excessive moisture
3. Improper venting
4. Excessive carbouacious material
5. Any of the above
- e. Any of the above
1. Hard ramming
2. Excessive moisture
3. Improper venting
4. Excessive carbouacious material
5. Any of the above