Workshop Technology
Notching is the operation of

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

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Workshop Technology
In permanent mould casting method

None of these
Molten metal is poured and allowed to solidify while the mould is revolving
Molten metal is forced into mould under high pressure
Molten metal is poured in a metallic mould, retained in the mould long enough for the outer skin to solidify and finally mould is turned over to remove molten metal still in molten condition

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Workshop Technology
Sand wash is a casting defect which

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

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