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

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Manufacturing And Production Technology
The primary purpose of a sprue in a casting mould is to

Feed the casting at a rate consistent with the rate of solidification
Act as a reservoir for molten metal
Help feed the casting until all solidification takes place
Feed molten metal from the pouring basin to the gate

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Manufacturing And Production Technology
In plunge grinding

The work is reciprocated as the wheel feeds to produce cylinders longer than the width of wheel face
The work rotates in a fixed position as the wheel feeds to produce cylinders equal to or shorter than the width of wheel face
The work rotates in a fixed position as the wheel feeds to produce cylinders longer than the width of wheel face
The work is reciprocated as the wheel feeds to produce cylinders shorter than the width of wheel face

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