Manufacturing And Production Technology
Calculate the weld per minute, 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.

22 welds/min, 55 mm/min
500 welds/min, 1250 mm/min
600 welds/min, 1500 mm/min
3000 welds/min, 75 mm/min

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

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

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Manufacturing And Production Technology
Trepanning is an operation of

Making a cone-shaped enlargement of the end of a hole
Producing a hole by removing metal along the circumference of a hollow cutting tool
Sizing and finishing a small diameter hole
Smoothing and squaring the surface around a hole

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