Powder Metallurgy

A part produced after compaction in powder metallurgy is termed as ______________

• Welded part

• Cast part

• Forged part

• Green compact

Which of the following method is used to make powder for brittle metals?

• Mechanical Pulverisation

• Electrolytic process

• Chemical Reduction

• Atomization

Which method is used to make powder of metals having low melting point?

• Mechanical pulverisation

• Electrolytic process

• Chemical reduction

• Atomization

In atomization

• passing molten metal through orifice and cooling it by dropping into water

• molten metal is forced through a small orifice and broken up by a stream of compressed air

• powder of metal is made by ball milling

• the hydrogen reduces the oxide to metallic powder

The process carried out in powder metallurgy is as follows

i.) preparation of powder ii.) Blending of powder iii.) Compacting of powder iv.) Sintering

• i, ii, iii, iv

• i, iii, ii, iv

• ii, i, iii, iv

• iii, i, ii, iv

The parts produced by Powder metallurgy

• always require machining

• are of higher dimensional accuracy

• can not be heat treated

• none of the above

Which of the following tool is manufactured by powder metallurgy?

• High speed steel

• Sintered carbides

• High carbon steel

• Low carbon steel

Sintering increases

• electrical conductivity, density and ductility

• electrical conductivity, density and brittleness

• porosity, electrical conductivity and brittleness

• porosity, density and ductility

Density in sintered product is improved by

i.) hot pressing ii.) Cold pressing iii.) Machining iv.) Coining

• i, ii & iv

• ii & iv

• i & iv

• i, ii, iii & iv

Porous product can be effectively produced using powder metallurgy

• True

• False