1. Which of the following P/M parts exhibit a short cutting tool life?
A. Dense
B. Very dense
C. Sintered
D. Porous
.Answer: D
2. What should be added to the iron powder mix to improve the speed capability?
A. Lead
B. Molybdenum
C. Bismuth
D. Vanadium
.
Answer: A
3. 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
Answer: D
4. 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
Answer: A
5. 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
Answer: A
6. Which of the following solution is used to fill the dew cup for carrying out moisture analysis?
A. Acetone
B. Carboxylic acid
C. Propane
D. Ethyl alcohol
Answer: A
7. Which of the following is not a characteristic of infiltrant?
A. Must not alloy or react with the skeleton metal
B. Good or perfect wetting
C. High surface tension
D. Melting point lower than the skeleton metal
Answer: A
8. Which of the following treatment is given to a thin-walled bushing that is oversize on both inside and outside diameter?
A. Negative sizing on both inside and outside
B. Positive sizing on both inside and outside
C. Positive sizing on inside, and negative sizing on outside
D. Positive sizing on outside, and negative sizing on inside
Answer: D
9. Which of the following is not a benefit of impregnation?
A. Dimensional tolerance
B. Improved machinability
C. Pressure-tightness
D. Porosity elimination
.
Answer: A
10. Which of the following are major components of atomization set-up?
A. Melting, atomization chamber, collection tank
B. Melting and superheating facility
C. Melting, atomization chamber, dry collection
D. Melting, atomization chamber
Answer: A
11. Which of the following are the stages of sintering, according to Sauerwald theory?
A. Adhesion, crystallization
B. Adhesion, recrystallization
C. Adhesion, bonding
D. Adhesion
Answer: A
12. Which of the following is not a mechanism of by which surface transportation occur during solid-state sintering?
A. Viscous flow
B. Volume diffusion
C. Surface diffusion
D. Plastic flow
Answer: C
13. Which of the following condition is necessary for obtaining consistent and satisfactory sintered components?
A. Short sintering time
B. Long sintering time
C. High power consumption
D. More labour cost
Answer: A
14. Which of the following are the important temperature controls used in sintering furnace?
A. Radiation pyrometers
B. Thermocouple
C. On-off controllers and proportional controllers
D. On-off controllers
Answer: A
15. Which of the following treatment fives a ferrito-pearlitic structure in P/M steel forgings?
A. Hardening
B. Nitrocarburizing
C. Tempering
D. Annealing
Answer: D
16. Which of the following kind of porosity leads to longer tool life?
A. Either very high or very low
B. Very high
C. Moderate
D. Very low
Answer: A
17. Which of the following is not a characteristic of the bearings produced from iron?
A. High porosity
B. Good wear resistance
C. Low-oil-volume capacity
D. High-oil-volume capacity
Answer: C
18. Which of the following is not a type of bearing?
A. Babbit backed steel
B. Steel backed steel
C. Unbacked bearings
D. Teflon bearing
Answer: A
19. 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
.
Answer: C
20. 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
Answer: B
21. 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
Answer: A
22. 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
Answer: A
23. 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
Answer: D
24. 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
Answer: C
25. 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
Answer: C
26. Which of the following is used to prepare SiN?
A. Hot forging
B. Liquid phase sintering
C. Reaction sintering
D. Solid-state sintering
Answer: C
27. Which of the following additive is added to improve the tool life of steel parts?
A. Lead
B. Copper
C. Sulphur
D. Bismuth
Answer: C
28. 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
Answer: D
29. Tin powder is made by _________
A. Electrolysis
B. Cold stream process
C. Atomization
D. Reduction
Answer: C
30. Which of the following changes do not occur on during recrystallization?
A. Phase changes
B. Grain shrinkage
C. Precipitation
D. Pore shrinkage
Answer: C
31. 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
Answer: B
32. 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
Answer: A
33. 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
Answer: C
