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.

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

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Manufacturing And Production Technology
In centreless grinding, work place centre will be

Above the line joining the two wheel centres
On the line joining the two wheel centres
At the intersection of the line joining the wheel centres with the work place plane
Below the line joining the two wheel centres

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