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

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Workshop Technology
Riddle is used for

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

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