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

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Manufacturing And Production Technology
In plunge grinding

The work is reciprocated as the wheel feeds to produce cylinders shorter than the width of wheel face
The work rotates in a fixed position as the wheel feeds to produce cylinders equal to or shorter than the width of wheel face
The work is reciprocated as the wheel feeds to produce cylinders longer than the width of wheel face
The work rotates in a fixed position as the wheel feeds to produce cylinders longer than the width of wheel face

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