M

Mr. Dubey • 52.30K Points
Coach 

Q. Which defect is caused due to the conversion of moisture to steam because of the heat of molten metal?

(A) blow holes
(B) open blows
(C) air inclusions
(D) cold shut
Correct : Option (A)

Explanation: 
 blow holes are entrapped gases, which are formed as a result of gases from mould, molten metal and stream sand. further these are caused due to the conversion of moisture to steam because of the heat of molten metal.

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