About Powder Metallurgy

Following are some of the multiple choice questions on the Powder Metallurgy with answers that will help the students in developing their knowledge.

Powder Metallurgy MCQ

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

  • Mechanical pulverisation
  • Electrolytic process
  • Chemical reduction
  • Atomization

2. Powder metallurgy process consist of the following operations, in sequence:

  • powder production, blending, compaction, sintering
  • powder production, sintering, compaction, blending
  • powder production, compaction, blending, sintering
  • None of these

3. This is the pre-alloyed powder used in powder metallurgy, except ?

  • stainless steel
  • cooper alloy
  • high speed steel
  • aluminum

4. The two types of metals are Ferrous and Nonferrous.

  • True
  • False

5. What process of rapidly cooling are used.

  • Air quenching
  • Oil quenching
  • Water quenching
  • All Of above

6. Which one is not the powder metallurgy product ?

  • iron & steel
  • aluminium
  • tin
  • zinc

7. Stainless steel contains which elements.

  • Iron
  • Carbon
  • Both A & B
  • None of these

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

  • Mechanical Pulverisation
  • Electrolytic process
  • Chemical Reduction
  • Atomization

9. Which of the following tool is manufactured by powder metallurgy?

  • High speed steel
  • Sintered carbides
  • High carbon steel
  • Low carbon steel

10. What is Mesh Count

  • refers to the number of openings per linear inch of screen
  • refers to the number of inch of screen
  • refers to the numbers of particles
  • all of above

11. Based on answer below, which is not the type of particle shape in Powder Metallurgy?

  • spherical
  • diamond
  • spongey
  • flakey

12. What is the disadvantage of powder metallurgy ?

  • no skill labor required
  • reduction in production time
  • close dimensional tolerence
  • die design limit the size of product

13. Which one is not the particle shape in powder metallurgy ?

  • cylindrical
  • rectangular
  • spherical
  • cubic

14. Which one is the third process occur in sintering sequence ?

  • point bonding
  • grain boundary
  • pores
  • necks

15. Which of the following is the advantages of powder metallurgy except?

  • composition of product can be controlled
  • close dimensional tolerances can be mantained
  • there are no lost of material
  • the product has high porosity

16. What occupation is most likely to specialize in the materials science.

  • Engineers
  • Metallurgist
  • Welder
  • Machinist

17. What property defines a metals ability to withstand twisting, bending, stretching, or deformation without breaking.

  • Hardness
  • Brittleness
  • Ductility
  • Toughness

18. What property defines the manner in which various metals will react to cutting tools.

  • Tensile strength
  • Strength
  • Machinability
  • Finish

19. Which of the processes listed below is NOT included in powder metal compaction

  • Pressing
  • Casting
  • Extrusion
  • Iso-static pressing

20. Which of below is the limitation / disadvantage of powder metallurgy?

  • pure metal powders are very expensive to produce
  • wide range of metaal powder like steels,bronze etc
  • poor plastic properties except good strength and elongation
  • the geometries are very limit

21. Metal consists of one or more chemical elements having a crystalline structure.

  • Atoms
  • Nuclei
  • Grains
  • All Of above

22. Powder metallurgy is a process whereby metallic shapes are manufactured from

  • metallic powders
  • plastic
  • machining
  • grinding

23. The following are the advantages of powder metallurgy EXCEPT?

  • composition of product can be controlled
  • close dimensional tolerances can be mantained
  • there are no lost of material
  • the product has high porosity

24. A atom that gains electrons in the reaction is ...

  • being reduced
  • the reducing agent
  • always a nonmetal
  • none of the above

25. The process of crushing the ore into a powder is called _______.

  • pulverization
  • powderation
  • smelting
  • calcination

26. Which of below is the limitations and disadvantage of powder metallurgy?

  • pure metal powders are very expensive to produce
  • wide range of metaal powder like steels,bronze etc
  • poor plastic properties except good strength and elongation
  • the geometries are very limit

27. 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

28. Green strength is

  • Strength of unsintered components
  • Strength sintered components
  • Strength of raw metals
  • Difference in strength of sintered and unsintered components

29. ___________ 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

30. 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

31. Copper is the primary metal produced by ______________

  • Atomisation
  • Crushing
  • Electrolysis
  • Compaction

32. 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

33. ___________ is simply the empty space in the product material.

  • Viscosity
  • Malleability
  • Porosity
  • Ductility

34. 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

35. 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

36. 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

37. 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

38. 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

39. 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

40. Sintering increases

  • electrical conductivity, density and ductility
  • electrical conductivity, density and brittleness
  • porosity, electrical conductivity and brittleness
  • porosity, density and ductility

41. 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

42. The parts produced by Powder metallurgy

  • always require machining
  • are of higher dimensional accuracy
  • can not be heat treated
  • none of the above

43. The process carried out in powder metallurgy is as followsi.) 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

44. 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

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

  • Welded part
  • Cast part
  • Forged part
  • Green compact

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