Workshop Technology
Piercing is an operation of cutting

A cylindrical hole in a sheet of metal by the punch and the die
A number of holes evenly spaced in a regular pattern on a sheet of metal
A flat sheet to the desired shape
A hole (other than cylindrical) in a sheet of metal by the punch and the die

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Workshop Technology
A progressive limit gauge has

'Go' member at one end and 'Not go' member at the other end
'Go' and 'Not go' member on the same side of the gauge
Separate 'Go' and 'Not go' members
None of the listed here

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Workshop Technology
The purpose of a riser is to

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

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