South Carolina Powder Metallurgy
Technician Certification License Exam
Practice Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. Powder metallurgy is best defined as the process of manufacturing
metal parts by
A. Compressing and sintering powdered metals
B. Casting molten metal into molds
C. Rolling metal into thin sheets
D. Welding individual components
Powder metallurgy involves compacting metal powders and then
sintering them to create solid components.
2. In powder metallurgy, sintering primarily serves to
A. Cool the compacted part rapidly
B. Bond powder particles through diffusion at elevated temperatures
C. Melt the part completely
D. Add alloying elements after compaction
Sintering strengthens a compact by diffusing atoms across particle
boundaries without melting the base material.
,3. The green strength of a powder metallurgy compact refers to
A. Its strength after heat treatment
B. Its strength after sintering
C. Its strength immediately after compaction, before sintering
D. Its strength in corrosive environments
Green strength is the mechanical integrity of the compact prior to
sintering.
4. Which of the following powders is most commonly used in powder
metallurgy for structural parts?
A. Aluminum oxide
B. Copper sulfate
C. Iron-based powders
D. Lead
Iron-based powders are predominant due to cost-effectiveness and
mechanical properties suitable for structural components.
5. The primary purpose of powder atomization in powder metallurgy is to
A. Harden the metal
B. Increase surface finish
C. Produce fine, uniform metal powders
D. Remove contaminants from metal
Atomization creates metal powders with controlled particle sizes
suitable for consistent compaction.
6. In a powder metallurgy process, lubrication is added to powder to
A. Increase hardness
B. Decrease sintering temperature
C. Reduce die wall friction during compaction
D. Prevent oxidation during sintering
Lubricants minimize friction between powder and die surfaces to
improve ejection and tool life.
, 7. Which compaction method applies pressure from multiple directions
simultaneously?
A. Uniaxial pressing
B. Roll compaction
C. Isostatic pressing
D. Hot forging
Isostatic pressing applies equal pressure in all directions to achieve
uniform density.
8. A powder metallurgy part with a relative density of 95% means it has
A. 5% more density than theoretical maximum
B. 95% of the theoretical maximum density
C. 5% porosity by mass
D. 95% porosity by volume
Relative density compares the part’s density to the theoretical fully
dense material.
9. The Hall flowmeter is used to measure
A. Thermal conductivity
B. Particle hardness
C. Flowability of metal powders
D. Electrical resistance
The Hall flowmeter quantifies how easily powders flow, critical for
die filling.
10. Green compacts must be carefully handled because they are
A. Extremely dense
B. Relatively weak before sintering
C. Already fully hardened
D. Corrosion-resistant
Before sintering, green compacts have low strength and can fracture
under stress.
Technician Certification License Exam
Practice Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. Powder metallurgy is best defined as the process of manufacturing
metal parts by
A. Compressing and sintering powdered metals
B. Casting molten metal into molds
C. Rolling metal into thin sheets
D. Welding individual components
Powder metallurgy involves compacting metal powders and then
sintering them to create solid components.
2. In powder metallurgy, sintering primarily serves to
A. Cool the compacted part rapidly
B. Bond powder particles through diffusion at elevated temperatures
C. Melt the part completely
D. Add alloying elements after compaction
Sintering strengthens a compact by diffusing atoms across particle
boundaries without melting the base material.
,3. The green strength of a powder metallurgy compact refers to
A. Its strength after heat treatment
B. Its strength after sintering
C. Its strength immediately after compaction, before sintering
D. Its strength in corrosive environments
Green strength is the mechanical integrity of the compact prior to
sintering.
4. Which of the following powders is most commonly used in powder
metallurgy for structural parts?
A. Aluminum oxide
B. Copper sulfate
C. Iron-based powders
D. Lead
Iron-based powders are predominant due to cost-effectiveness and
mechanical properties suitable for structural components.
5. The primary purpose of powder atomization in powder metallurgy is to
A. Harden the metal
B. Increase surface finish
C. Produce fine, uniform metal powders
D. Remove contaminants from metal
Atomization creates metal powders with controlled particle sizes
suitable for consistent compaction.
6. In a powder metallurgy process, lubrication is added to powder to
A. Increase hardness
B. Decrease sintering temperature
C. Reduce die wall friction during compaction
D. Prevent oxidation during sintering
Lubricants minimize friction between powder and die surfaces to
improve ejection and tool life.
, 7. Which compaction method applies pressure from multiple directions
simultaneously?
A. Uniaxial pressing
B. Roll compaction
C. Isostatic pressing
D. Hot forging
Isostatic pressing applies equal pressure in all directions to achieve
uniform density.
8. A powder metallurgy part with a relative density of 95% means it has
A. 5% more density than theoretical maximum
B. 95% of the theoretical maximum density
C. 5% porosity by mass
D. 95% porosity by volume
Relative density compares the part’s density to the theoretical fully
dense material.
9. The Hall flowmeter is used to measure
A. Thermal conductivity
B. Particle hardness
C. Flowability of metal powders
D. Electrical resistance
The Hall flowmeter quantifies how easily powders flow, critical for
die filling.
10. Green compacts must be carefully handled because they are
A. Extremely dense
B. Relatively weak before sintering
C. Already fully hardened
D. Corrosion-resistant
Before sintering, green compacts have low strength and can fracture
under stress.
