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

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

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Workshop Technology
Sand wash is a casting defect which

Occurs near the ingates as rough lumps on the surface of a casting
Results in general enlargement of the casting
Results in a mismatching of the top and bottom parts of a casting
Occurs as sand patches on the upper surface of a casting

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