Which powder manufacturing process is used in order to obtain a spherical
powder?
a. Plasma atomisation
b. Electrolytic technique
c. Chemical technique
d. High energy milling
Plasma atomisation
The relative green density of a powder compact is an indirect measure of
How much void is present in the powder compact
A cold pressed components made out of pure Mg (Tm = 650ºC) needs to be
sintered, which temperature is the most approximate?
a. 270ºC
b. 370ºC
c. 470ºC
d. 670ºC
c. 470ºC
During sintering, at which stage does neck growth happen?
Initial stage
If a part has to be shaped using a powder metallurgy technique that is assisted by
binder, which technique would you choose?
a. Hot isostatic pressing
b. Metal injection moulding
c. Cold isostatic pressing
d. Spark plasma sintering
b. Metal injection moulding
Which is the best sintering atmosphere for a reactive metal such as titanium or
tantalum?
Vacuum
Which phenomenon takes place only during hot uniaxial pressing of a loose powder?
Creep
A single level part that requires pressing from two directions is classified as?
Class 2
Which of the following is a freeform powder metallurgy fabrication process?
a. Selective laser sintering
a. Pressing and sintering
b. Hot isostatic pressing
c. Spark plasma sintering
Selective laser sintering
Which one of the following processes is not a finishing operation for powder
metallurgy components?
a. Coning
b. Joining
c. Sintering
d. Machining
c. Sintering
Why liquid phase sintering is often faster than solid state sintering?
Atomic diffusion in the liquid is faster than that in the solid
If a continuous sheet of steel has to be manufactured starting from powders, which of
the following method is needed?
Powder rolling
Which of the following is a correct definition?
a. Capital goods are products directly purchased by customers
b. Capital goods are the equipment available in a company
c. Capital goods are products purchased by companies to provide services
d. Consumer goods are products purchased by companies to provide services
Capital goods are products purchased by companies to provide services
- Considering the relationship between product variety and production quantity.
a. Product variety and production quantity are nor related to each other
b. If the product variety is low, the production quantity is likely to be low
c. If the product variety is high, the production quantity is likely to be high
d. If the product variety is high, the production quantity is likely to low
If the product variety is high, the production quantity is likely to low
In terms of manufacturing economic, which of the following best represent the
manufacturing costs?
a. Materials, direct labour, and marketing
b. Materials, direct labour, and R&D
c. Materials, direct labour, and machinery
d. None of the above
Materials, direct labour, and machinery
Which of the following is NOT correct about powder metallurgy?
a. Powder metallurgy is used to make polymeric products
b. Powder metallurgy is used to make metallic products
c. Powder metallurgy is used to make ceramic products
d. Powder metallurgy is used to make composites
Powder metallurgy is used to make polymeric products
Which of the following techniques can be used to measure the particle size of
metallic powders?
a. Screening or sieve analysis
b. Light scattering measurements
c. Microscopy
d. All of the above
All of the above
The density of a powder in its loose state without agitation is known as?
Apparent density
Which powder manufacturing process permits to obtain powders with the highest
product purity?
Electrolytic technique
Which powder manufacturing process permits to obtain spherical powders?
Gas atomisation
Only one of the following properties depends on the shaping of the part, which
one?
a. Particle size
b. Particle shape
c. Angle of repose
d. Compressibility
Compressibility
The green density of a powder compact is an indirect measure of
How much porosity is present in the powder compact
Comparing cold and warm die compaction, for the same applied compaction
pressure:
a. Higher green densities are achieved via cold die compaction
b. Higher green densities are achieved via warm die compaction
c. The same green density is achieved via cold and warm die compaction
d. The green density does not depend on the die compaction technique
Higher green densities are achieved via warm die compaction
Which of the following is true?
a. Cold isostatic pressing permits to obtain a more uniform density distribution
b. Cold die compaction permits to obtain a more uniform density distribution
c. Cold isostatic pressing is preferred for simple shapes
d. A rigid die is used in cold isostatic pressing
Cold isostatic pressing permits to obtain a more uniform density distribution
