Manufacturing And Production Technology
The maximum possible draft in cold rolling of sheet increases with the

Decrease in coefficient of friction
Increase in coefficient of friction
Decrease in roll radius
Decrease in roll velocity

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

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Manufacturing And Production Technology
When the temperature of a solid metal increases,

Both strength and ductility of the metal increases
Strength of the metal decreases but ductility increases
Both strength and ductility of the metal decreases
Strength of the metal increases but ductility decreases

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