Workshop Technology
A two high rolling mill consists of two rolls which rotate

At different speeds and in the opposite direction
At the same speed and in the same direction
At different speeds and in the same direction
At the same speed but in opposite direction

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Workshop Technology
Riddle is used for

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

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