Workshop Technology
Piercing is an operation of cutting

A cylindrical hole 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 flat sheet to the desired shape
A hole (other than cylindrical) in a sheet of metal by the punch and the die

ANSWER DOWNLOAD EXAMIANS APP

Workshop Technology
Swab is used for

Moistening the sand around the edge before removing pattern
Cleaning the moulding sand
Reinforcement of sand in the top part of the moulding box
Smoothing and cleaning out depressions in the mould

ANSWER DOWNLOAD EXAMIANS APP