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

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

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Workshop Technology
Piercing is an operation of cutting

A hole (other than cylindrical) in a sheet of metal by the punch and the die
A flat sheet to the desired shape
A cylindrical hole in a sheet of metal by the punch and the die
A number of holes evenly spaced in a regular pattern on a sheet of metal

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