Workshop Technology
The blank diameter used in thread rolling will be

Equal to pitch diameter of the thread
A little larger than the minor diameter of the thread
A little larger than the pitch diameter of the thread
Equal to minor diameter of the thread

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Workshop Technology
For arc welding

Direct current is used
Alternating current with high frequency is used
Alternating current with low frequency is used
Any one of these

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Workshop Technology
The purpose of a gate is to

Delivers molten metal into the mould cavity
Feed the molten metal to the casting in order to compensate for the shrinkage
Delivers molten metal from pouring basin to gate
Act as a reservoir for the molten metal

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