Manufacturing And Production Technology
Volume of a cube of side ‘l’ and volume of a sphere of radius ‘r’ are equal. Both the cube and the sphere are solid and of same material. They are being cast. The ratio of the solidification time of the cube to the same of the sphere is

(4π/6)² × (r/l)⁴
(4π/6)³ × (r/l)⁶
(4π/6) × (r/l)²
(4π/6)² × (r/l)³

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Manufacturing And Production Technology
The effect of setting a boring tool above center height leads to

Increase in the effective rake angle and a decrease in the effective clearance angle
Decrease in both effective rake angle and effective clearance angle
Decrease in the effective rake angle and an increase in the effective clearance angle
Increase in both effective rake angle and effective clearance angle

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