Manufacturing And Production Technology
What is the method of brazing used to join relatively small assemblies made from materials that either do not oxidize at the brazing temperature or can be protected from oxidation with a flux?

Furnace brazing
Torch brazing
Resistance brazing
Dip brazing

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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
5.03 rpm, 600 joules
2.17 rpm, 600 joules
22 rpm, 600 joules

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

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

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