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

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

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Workshop Technology
Riddle is used for

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

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Workshop Technology
For arc welding

Alternating current with low frequency is used
Direct current is used
Alternating current with high frequency is used
Any one of these

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