M

Mr. Dubey • 52.30K Points
Coach 

Q. Which of the following defect tends to draw surface oxides and impurities towards the centre of billet?

(A) blow hole
(B) cold shut
(C) surface cracking
(D) pipe defect
Correct : Option (D)

Explanation: 
 pipe defect is the formation of sin hole at the end of the billet. it is associated with direct extrusion. the use of

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