Workshop Technology
The algebraic difference between the minimum limit and the basic size is called

Upper deviation
Lower deviation
Fundamental deviation
Actual deviation

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Workshop Technology
The purpose of a riser is to

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

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