For ingot breakdown by hot rolling, the rolls are generally grooved paralled to the roll axis in order to
P. increase the arigle of bite
Q. decrease the rolling load
R. achieve larger reduction
S. decrease roll flattening
A. P, Q
B. Q, R
C. P, R
D. Q, S
Answer: Option D
This Question Belongs to Metallurgical Engineering >> Mechanical Metallurgy
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In a tensile test of ductile material, necking starts at
A. lower yield stress
B. upper yield stress
C. ultimate tensile strength
D. just before fracture
A. $$2 + \frac{{\sigma 3}}{2}$$
B. $$4 + \frac{{\sigma 3}}{5}$$
C. $$5 + \frac{{\sigma 3}}{2}$$
D. $$5 + \frac{{\sigma 3}}{3}$$
A. P-1, Q-2, R-3
B. P-4, Q-3, R-1
C. P-3, Q-1, R-4
D. P-2, Q-1, R-3
A. the outer edges of the rod
B. $$\frac{r}{3}$$ from the centre
C. $$\frac{r}{2}$$ from the centre
D. the centre
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