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Material Science - Midterm > Chapter 3: Metallurgy and Assembly > Flashcards

Chapter 3: Metallurgy and Assembly Flashcards

1
Q 
All of these are important properties and
characteristics of powder except :
-Particle size
-Chemistry and purity
-Size distribution
-Viscosity
A

Viscosity

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2
Q

_______ is a process in which
molten metals are broken into small drops
of liquid by high-speed fluids (gas as air or
inert gas; liquid as water) or fluids with
centrifugal force, and then solidified into
powder.

A

Atomization

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3
Q

_______ is the name given to the
process by which fine powdered materials
are blended, pressed into a desired shape,
and then heated to bond surface.

A

Powder Metallurgy

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4
Q 
Precleaned & preloaded with brazing metal
and heated in a furnace.
-Torch Brazing
-Diffusion Brazing
-Furnace brazing
-Infrared Brazing
A

Furnace brazing

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5
Q 
\_\_\_\_\_\_\_ is a fastening operation
in which a stitching machine is used to form
the U-shaped stitches one at a time from
steel wire and immediately drive them
through the two parts to be joined.
A

Stitching

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6
Q

It is an unthreaded, headed pin used to join
two (or more) parts by passing the pin
through holes in the parts and then forming
(upsetting) a second head in the pin on the
opposite side
-bolt
-stud
-screw
-rivet

A

rivet

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7
Q

It is a mechanized technique in which a
rotating roller is partially submersed in a pan
of liquid adhesive and picks up a coating of
the adhesive, which is then transferred to the
work surface
-Manual rollers
-Roll coating
-spraying
-automatic applicators

A

Roll coating

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8
Q

It is the measure of a powder’s ability to fill
available space without external pressure
Select the correct response:
-Apparent density
-Green strength
-Flow rate
-Compressibility

A

Apparent density

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9
Q 
It is where the edges of two separate sheet-
metal parts or the opposite edges of the
same part are bent over to form the
fastening seam
Select the correct response:
-dimpling
-embossed protrusions
-seaming
-lanced tabs
A

seaming

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10
Q 
In this process, it combines powder
compaction and sintering into a single
operation
Select the correct response:
-isothermal compaction
-Hot-isostatic pressing
-Isostatic compacting
A

Hot-isostatic pressing

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11
Q 
Stage of sintering where it combusts any air
and removes lubricants or binders that
would interfere with good bonding
Select the correct response:
-purge
-burn out
-high temperature
-cooling period
A

purge

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12
Q

_____ is a process in which the
edges of one part are deformed over a
mating component, is another example of
integral assembly.

A

Crimping

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13
Q 
Stage in sintering process where it lowers
the temperature of the products in a
controlled atmosphere
Select the correct response:
-high temperature
-purge
-cooling period
-burn out
A

cooling period

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14
Q 
It is the effectiveness of applied pressure
Select the correct response:
-Green strength
-Compressibility
-flow rate
-Apparent density
A

Compressibility

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15
Q

Popular approach to attaching circuits to circuit boards

  • resistance soldering
  • ultrasonic soldering
  • reflow soldering
  • wave soldering
A

wave soldering

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16
Q 
It is internally threaded fastener having standard threads that match those on bolts of the same diameter, pitch, and thread form
Select the correct response:
-filler
-bolt
-screw 
-nut
A

nut

17
Q 
Type of adhesive which include a variety of thermoplastic and thermosetting polymers
Select the correct response:
-None of these
-Inorganic adhesives
-Synthetic adhesives
-Natural adhesives
A

Synthetic adhesives

18
Q

The following are methods in powder manufacturing except:
Select the correct response:
-Evaporation powders
-Chemical reduction of particulate compounds
-Preminit Precipitation from solution
- Electrolytic deposition

A

evaporation powders

19
Q 
The method involves the use of a long thread or cord interwoven with the parts so as to produce a continuous seam between them.
Select the correct response
-stitching
-rivet
-stapling
-sewing
A

sewing

20
Q 
It is prepared like fusion welding and filler metal is deposited at the joint with the use of an oxyacetylene torch
Select the correct response.
-torch brazing
-none of these
-induction brazing
-braze welding
A

braze welding

21
Q

In sintering process, all stages must be conducted in oxygenated conditions
Select the correct response:
-True
-False

A

False

22
Q 
The following are fastening methods except:
Select the correct response.
-Snap-in Fasteners
-Crimping
-Soldering
-Stapling
A

Soldering

23
Q 
It is used to describe the strength of the pressed powder after compacting
Select the correct response:
-Apparent density
-Flow rate
-Green strength
-Compressibility
A

Green strength

24
Q 
In this process, the pressed-powder compacts are heated in a controlled atmosphere to right below the melting point
Select the correct response.
-blending
-compacting
-mixing
-sintering
A

sintering

25
Q

Metal powders can flow like liquid
Select the correct response.
-True
-False

A

False

26
Q 
The powder metallurgy has basic steps
Select the correct response.
-6
-5
-4
-3
A

4

27
Q

A heated preform is surrounded by hot granular material, transmitting uniform pressure
Select the correct response:
-High-temperature metal deformation process
-Spray forming
-Ceracon process
-None of these

A

Ceracon process

28
Q 
It is compacted and densified into a shape, known as green compact
Select the correct response:
-granulated powder
-loose powder
-thick powder
-compact powder
A

Loose powder

29
Q

Most powder metallurgy products are ready to use after the sintering process
Select the correct response:
True
False

A

True

30
Q 
It uses manually operated pressure-fed flow guns, has more consistent control than brushing.
Select the correct response
-Flowing
-Brushing
-Manual rollers
-Silk screening
A

Flowing

31
Q 
It measures the ease with which powder can be fed and distributed into a die
Select the correct response:
-Compressibility
-Flow rate
-Apparent density
-Green strength
A

Flow rate

32
Q

In adhesive bonding, the parts being joined are called _____

A

adherends

33
Q

Compacting comes before mixing or blending process
Select the correct response:
True
False

A

False

34
Q 
Type of flux that cleans the surface rapidly
Select the correct response:
-Tin-lead
-Noncorrosive resin
-Lead silver
-Inorganic acids
A

Inorganic acids

35
Q

Blending or mixing operations can be done either wet or dry

  • True
  • False
A

True

Material Science - Midterm (4 decks)

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