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
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
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

22
Q
The following are fastening methods except:
Select the correct response.
-Snap-in Fasteners
-Crimping
-Soldering
-Stapling
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
25
Metal powders can flow like liquid Select the correct response. -True -False
False
26
``` The powder metallurgy has basic steps Select the correct response. -6 -5 -4 -3 ```
4
27
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
Ceracon process
28
``` It is compacted and densified into a shape, known as green compact Select the correct response: -granulated powder -loose powder -thick powder -compact powder ```
Loose powder
29
Most powder metallurgy products are ready to use after the sintering process Select the correct response: True False
True
30
``` It uses manually operated pressure-fed flow guns, has more consistent control than brushing. Select the correct response -Flowing -Brushing -Manual rollers -Silk screening ```
Flowing
31
``` 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 ```
Flow rate
32
In adhesive bonding, the parts being joined are called _____
adherends
33
Compacting comes before mixing or blending process Select the correct response: True False
False
34
``` Type of flux that cleans the surface rapidly Select the correct response: -Tin-lead -Noncorrosive resin -Lead silver -Inorganic acids ```
Inorganic acids
35
Blending or mixing operations can be done either wet or dry - True - False
True