Workshop Technology
Piercing is an operation of cutting

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

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

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Workshop Technology
During hot working of metals

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

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