Workshop Technology
When the molten metal is fed in the cavity of a metallic mould by gravity, the method of casting is known as

Die casting method
Centrifugal casting method
Slush casting method
Permanent mould casting method

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Workshop Technology
Riddle is used for

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

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