Manufacturing And Production Technology
Which of the following statement is correct in regard to centreless grinding?

All of these
It is a continuous process and adopted for production work
The workpiece is supported throughout its entire length as grinding takes place
It requires no holding device for the work

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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
5.03 rpm, 600 joules
6.8 rpm, 6 joules

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