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

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Manufacturing And Production Technology
Work speed of circular electrode of 220 mm diameter for carrying out seam welding at 4 welds per cm on 1.6 mm thick mild steel tube. Welding cycle consists of 3 cycles ‘on’ and 2 cycles ‘off’ Power supply is at 50 Hz. Calculate R.P.M. and energy requirement of the above circular electrodes assuming effective resistance between electrodes as 100 ohm.

22 rpm, 600 joules
2.17 rpm, 600 joules
6.8 rpm, 6 joules
5.03 rpm, 600 joules

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