Workshop Technology
A three high rolling mill consists of three rolls placed one above the other. Which of the following statement is correct?

The upper and middle rolls rotate in the same direction whereas the bottom roll rotates in opposite direction
The bottom and middle roll rotate in the same direction
Any one of the above
The upper and bottom rolls rotate in the same direction whereas the middle roll rotates in opposite direction

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Workshop Technology
During hot working of metals

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

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