Workshop Technology
In a four high rolling mill, the diameter of backing up rolls is ________ the diameter of working rolls.

None of these
Larger than
Equal to
Smaller than

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Workshop Technology
Piercing is an operation of cutting

A flat sheet to the desired shape
A hole (other than cylindrical) in a sheet of metal by the punch and the die
A number of holes evenly spaced in a regular pattern on a sheet of metal
A cylindrical hole in a sheet of metal by the punch and the die

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