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

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

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Workshop Technology
A jolt machine is used to

Ram the sand harder at the pattern face with decreasing hardness towards the back of the mould
Produce uniform packing of sand in the mould
Ram the sand harder at the back of the mould and softer on the pattern face
Produce uniform sand hardness throughout the mould

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Workshop Technology
During hot working of metals

Porosity of the metal is largely eliminated
Grain structure of the metal is refined
Mechanical properties are improved due to refinement of grains
All of the listed here

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