Workshop Technology
In a unilateral system of tolerance, the tolerance is allowed on

One side of the actual size
Both sides of the nominal size
One side of the nominal size
Both sides of the actual size

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Workshop Technology
The purpose of a riser is to

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

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