Workshop Technology
The metal extrusion process is generally used for producing

Uniform hollow sections
Uniform solid and hollow sections
Uniform solid sections
Varying solid and hollow sections

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Workshop Technology
Riddle is used for

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

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