A. ram the sand harder at the pattern face with decreasing hardness towards the back of the mould

B. ram the sand harder at the back of the mould and softer on the pattern face

C. produce uniform sand hardness throughout the mould

D. produce uniform packing of sand in the mould

A. poor surface finish is produced

B. scale is formed on the metal surface

C. close tolerances can not be maintained

D.  All of he above

A. steel, cast iron, copper, aluminium etc

B. brass and bronze

C.  hard surfacing materials such as stellite

D. All of the above

A. at the same speed and in the same direction

B. at the same speed but in opposite direction

C. at different speeds and in the same direction

D.  at different speeds and in the opposite direction

A. flat chisel

B. cape chisel

C. round nose chisel

D. diamond pointed chisel