Manufacturing And Production Technology
What is the type of joining process called, where the parts to be welded are kept in contact and rotated relative to each other and axial pressure is applied when the desired temperature is obtained?

Forge welding
Friction welding
Electron beam welding
Ultrasonic welding

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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.

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
Which of the following statement is correct regarding grinding of high carbon steel?

The grinding wheel has to be of open structure.
Aluminium oxide wheels are employed.
All of these
Grinding at high speed results in the reduction of chip thickness and cutting forces per grit.

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