Q.1
Which of the following conditions are necessary for the development of fluid film in porous bearings?
  • a) High speed
  • b) Viscosity
  • c) High speed and viscosity
  • d) Low speed
Q.2
What is metallurgy?
  • a) Technology of designing metals
  • b) Art and science of extracting metals from their ores
  • c) Technology of welding metals
  • d) None of the mentioned
Q.3
What is powder metallurgy?
  • a) Production and working of metals as fine powders
  • b) Working with metals as fine powders
  • c) Methods for utilizing metals as fine powders
  • d) None of the mentioned
Q.4
Which of the following is the application of powder metallurgy?
  • a) create unique materials with specific qualities that are impossible to accomplish using melting or shaping
  • b) create unique materials with specific qualities that are possible to accomplish using melting or shaping
  • c) All of the mentioned
  • d) None of the mentioned
Q.5
Which of the following is a step of powder metallurgy?
  • a) The production of metal powder
  • b) The consolidation and fusing of the powder into a solid metal
  • c) The compaction and shaping of the powder
  • d) All of the mentioned
Q.6
What is powder sintering process?
  • a) Cold treatment used to improve a material’s strength and structural integrity
  • b) Metal freezed to improve its strength and structural integrity
  • c) Thermal treatment used to improve a material’s strength and structural integrity
  • d) None of the mentioned
Q.7
Which of the following transforms compacted mechanical bonds between powder particles into metallurgical bonds?
  • a) SHP
  • b) Metal Injection Molding
  • c) Sintering
  • d) Mechanical alloying
Q.8
Which of the following is used to prepare SiN?
  • a) Hot forging
  • b) Liquid phase sintering
  • c) Reaction sintering
  • d) Solid-state sintering
Q.9
Which of the following additive is added to improve the tool life of steel parts?
  • a) Lead
  • b) Copper
  • c) Sulphur
  • d) Bismuth
Q.10
Steam treatment is not applicable for which of the following parts?
  • a) annealed parts
  • b) normalized parts
  • c) stress relived parts
  • d) hardened and tempered parts
Q.11
Tin powder is made by _________
  • a) Electrolysis
  • b) Cold stream process
  • c) Atomization
  • d) Reduction
Q.12
Which of the following changes do not occur on during recrystallization?
  • a) Phase changes
  • b) Grain shrinkage
  • c) Precipitation
  • d) Pore shrinkage
Q.13
Which of the following substance is added to iron powder to improve the compressive strength of bearing?
  • a) Lead
  • b) Copper
  • c) Sulphur
  • d) Bismuth
Q.14
Which of the following material on addition to the powder mix lowers the strength of the bearing?
  • a) Graphite
  • b) Oil
  • c) Sulphur
  • d) Bismuth
Q.15
Which of the following is not a characteristic of powder produced by precipitation from an aqueous solution method?
  • a) Low apparent density
  • b) Difficult to remove the adherent salts
  • c) High apparent density
  • d) Porous in nature
Q.16
Which of the following P/M parts exhibit a short cutting tool life?
  • a) Dense
  • b) Very dense
  • c) Sintered
  • d) Porous
Q.17
What should be added to the iron powder mix to improve the speed capability?
  • a) Lead
  • b) Molybdenum
  • c) Bismuth
  • d) Vanadium
Q.18
Which of the following powder production method is used for the production of non-porous bearing with steel backing?
  • a) Mechanical alloying
  • b) Water atomization
  • c) Electrolysis
  • d) Gas atomization
Q.19
Which of following is the correct set of material variables in sintering?
  • a) Green density and particle size
  • b) Particle structure and sintering atmosphere
  • c) Green density and sintering time
  • d) Particle composition, particle shape, green density and sintering temperature
Q.20
Which of the following are the essential parts of a sintering furnace?
  • a) Burn-off zone, sintering zone, and cooling zone
  • b) Sintering zone and cooling zone
  • c) Burn-on zone, sintering zone, and cooling zone
  • d) Preheat zone and sintering zone
0 h : 0 m : 1 s