A cup of $$10$$ $$cm$$ height and $$5$$ $$cm$$ diameter is to be made from a sheet metal of $$2mm$$ thickness. The number of deductions necessary will be

In .................. A ................. operation the diameter of the desired hole will be smaller than the diameter of the .................... B ......................

A. blanking / piercing
B. punch / die

In progressive die (for sheet metal), spring loaded stripper plate is used to clamps the stock until:

At $${1000^ \circ }C$$ the crystallographic structure of iron is ....................