Workshop Technology
The casting method adopted for ornaments and toys of nonferrous alloys, is

Permanent mould casting
Slush casting
Centrifugal casting
Die casting

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Workshop Technology
During hot working of metals

Porosity of the metal is largely eliminated
Grain structure of the metal is refined
Mechanical properties are improved due to refinement of grains
All of the listed here

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Workshop Technology
Notching is the operation of

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
Cutting a sheet of metal through part of its length and then bending the cut portion
Bending a sheet of metal along a curved axis

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