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

Actual deviation
Fundamental deviation
Upper deviation
Lower deviation

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Workshop Technology
The purpose of a riser is to

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

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Workshop Technology
Riddle is used for

Smoothing and cleaning out depressions in the mould
Reinforcement of sand in the top part of moulding box
Cleaning the moulding sand
Moistening the sand around the edge before removing pattern

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