ANS:C - hammering

The powder metallurgy process does not make metal powder by hammering. Powder metallurgy is a manufacturing process that involves shaping metal powders into desired components or products. The process typically includes steps such as powder production, mixing or blending, compacting, sintering, and finishing. While metal powders can be produced by methods such as atomization (breaking up molten metal into fine droplets), grinding or milling (reducing bulk metal into powder form), and electrolytic deposition (electroplating), hammering is not a method used to create metal powders for powder metallurgy. Hammering is a mechanical process used for shaping or forging metals into desired shapes or forms, but it does not involve reducing metal into powder form. Therefore, hammering is not used in the production of metal powders for powder metallurgy.