Workshop Technology
The purpose of a gate is to

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

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Workshop Technology
A progressive limit gauge has

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

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