Manufacturing and Industrial Engineering - GATE practice papers - Mechanical for Q. 383

Q.  What is the cause of formation of blow holes in metal casting? (Marks: 02)
- Published on 19 Oct 15

a. excessive moisture
b. presence of such ingredients which produce gas
c. fine grains
d. all of the above

ANSWER: all of the above
 
Blow holes appear as cavities in the casting. They are the entrapped bubbles of gases caused by excessive moisture, gas producing ingredients as well as fine grains.

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