Workshop Technology
For arc welding

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

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Workshop Technology
Notching is the operation of

Removal of metal to the desired shape from the edge of a plate
Cutting a sheet of metal through part of its length and then bending the cut portion
Cutting a sheet of metal in a straight line along the length
Bending a sheet of metal along a curved axis

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Workshop Technology
The purpose of a riser is to

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

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