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Practical dividing line between a ductile and brittle materials is suggested, when the ultimate elongation is about 5%. Generally, larger the knuckle radius, stronger is the corner torus section of a head. The knuckle radius provided should be less than __________ of the head. | |
A. | 6% of I.D. [Wrong Answer] |
B. | 3 times the thickness [Wrong Answer] |
C. | either (a) or (b), whichever is larger [Correct Answer] |
D. | either (a) or (b), whichever is smaller [Wrong Answer] |