• 1. 
    Green strength is

  • Strength of unsintered components
  • Strength sintered components
  • Strength of raw metals
  • Difference in strength of sintered and unsintered components
  • 2. 
    Sintering is done to _____________

  • increase final strength
  • decrease final strength
  • initially increase and then to decrease the strength
  • initially decrease and then to increase the strength
  • 3. 
    Process of forming metal powder by directing molten metal through an orifice after which it is break into small particle using high pressure fluid is known as?

  • Atomization
  • Reduction
  • Crushing
  • Electrolysis
  • 4. 
    ___________ is simply the empty space in the product material.

  • Viscosity
  • Malleability
  • Porosity
  • Ductility
  • 5. 
    Density in sintered product is improved byi.) hot pressing ii.) Cold pressing iii.) Machining iv.) Coining

  • i, ii & iv
  • ii & iv
  • i & iv
  • i, ii, iii & iv
  • 6. 
    The _________________ process yields net-shape, or near-net-shape parts, so that little or no machining is required to obtain a finished part in many cases.

  • Pulverisation
  • powder metallurgy
  • Atomic Reduction
  • Electrolytic process
  • 7. 
    Which method is used to make powder of metals having low melting point?

  • Mechanical pulverisation
  • Electrolytic process
  • Chemical reduction
  • Atomization
  • 8. 
    The process which allows us to create high-quality components, while near-net-shape dimensional control provides a high degree of control over the manufacturing process, facilitating the production of complex shapes is _________________

  • Powder metallurgy
  • Sand Casting
  • Machining
  • Metal casting
  • 9. 
    Which of the following tool is manufactured by powder metallurgy?

  • High speed steel
  • Sintered carbides
  • High carbon steel
  • Low carbon steel
  • 10. 
    Sintering increases

  • electrical conductivity, density and ductility
  • electrical conductivity, density and brittleness
  • porosity, electrical conductivity and brittleness
  • porosity, density and ductility
  • 11. 
    Range of particle size in powder to be used for powder metallurgy should vary from ___________________. Powder metallurgy has small wastage of material.

  • 4 microns to 200 microns
  • 0.300 to 0.003 microns
  • 12. 
    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
  • 13. 
    Which of the following method is used to make powder for brittle metals?

  • Mechanical Pulverisation
  • Electrolytic process
  • Chemical Reduction
  • Atomization
  • 14. 
    The parts produced by Powder metallurgy

  • always require machining
  • are of higher dimensional accuracy
  • can not be heat treated
  • none of the above
  • 15. 
    Sintering is a ____________________process commonly used to increase the strength and structural integrity of a material. Powder metallurgy use sintering to convert metal powders to end-use parts.

  • Mixing
  • heat treatment
  • Pressing
  • All the above
  • 16. 
    ___________ is the process of formation of metal powder to use in powder metallurgy by reducing some compound with CO or other reducing agents.

  • Reduction
  • Atomisation
  • Pulverisation
  • Electrolytic Process
  • 17. 
    The production of highly porous parts by ________ using suitable spacer materials is a well-established technique for titanium and stainless steel.

  • Press forming
  • Sand casting
  • Metal casting
  • powder metallurgy
  • 18. 
    The disintegration of a molten metal into particles by a rapidly moving gas or liquid stream or by other means is known as ____________

  • Mechanical Pulverisation
  • Atomization
  • Chemical reduction
  • Electrolytic Process
  • 19. 
    Porosity of sintered products can be improved by process of ____________ by which the pores are filled with a lower melting point metal by capillary action

  • Polymerisation
  • Pulverisation
  • Fragmentation
  • Infiltration
Report Question