Workshop Technology
A basic hole is one whose

Upper deviation is zero
None of these
Lower deviation is zero
Lower and upper deviations are zero

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Workshop Technology
Shift is a casting defect which

Results in general enlargement of a casting
Results in a mismatching of the top and bottom parts of a casting
Occurs as sand patches on the upper surface of a casting
Occurs near the ingates as rough lumps on the surface of a casting

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Workshop Technology
Swab is used for

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

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