Workshop Technology
If an aluminium pattern made from a wooden master pattern is to be used for grey iron castings, then the shrinkage allowance allowed on the wooden pattern should be

10 mm/m
16 mm/m
26 mm/m
20 mm/m

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Workshop Technology
Riddle is used for

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

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Workshop Technology
Notching is the operation of

Cutting a sheet of metal in a straight line along the length
Cutting a sheet of metal through part of its length and then bending the cut portion
Removal of metal to the desired shape from the edge of a plate
Bending a sheet of metal along a curved axis

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