Correct option is C
Knurling is the
odd one out because it is a
machining process used to create patterns (usually diamond or straight lines) on the surface of a workpiece to improve grip. In contrast,
rolling, extrusion, and forging are all
metal forming processes, where the shape of the metal is changed by applying compressive forces.
Rolling:
· Metal is passed between rollers to reduce thickness or change its shape.
· Used to produce sheets, plates, and structural sections.
Extrusion:
Metal is forced through a die to create long shapes with a uniform cross-section (e.g., pipes and rods).
Forging:
Metal is shaped by hammering or pressing, typically when hot, to improve strength and toughness.
Knurling:
· Performed on a lathe by using a knurling tool to create a textured surface.
· Used to enhance the grip on components like tool handles and fasteners.
