Workshop Technology
During drawing operation, the states of stress in cup would include

Tensile stress in the wall
None of these
Both (A) and (B)
Compressive stress in the flange

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Workshop Technology
Riddle is used for

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

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