CWB Welding Inspector Level III Study Guide ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
questions with verified detailed solutions ||\\//|| ||\\//|| ||\\//|| ||\\//||
Which of the following metals has the highest thermal conductivity?
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(a) carbon steel
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(b) stainless steel
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(c) aluminum - correct answer✔✔(c)
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The Ellingham diagram ||\\//|| ||\\//||
(a) is a plot of thermal conductivity against temperature,
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(b) shows the free energy of oxide formation against temperature.
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(c) shows the rate of oxidation of metals against temperature. - correct answer✔✔(b)
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True or False? ||\\//|| ||\\//||
A metal with a high negative free energy of oxide formation will generally require greater
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shielding from the atmosphere during welding. - correct answer✔✔True ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Electricity can be conducted by: ||\\//|| ||\\//|| ||\\//|| ||\\//||
(a) atoms and electrons.
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(b) electrons and ions.
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(c) only ions. - correct answer✔✔(b)
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Which of the following elements is often present in submerged arc fluxes to improve arc
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
stability?
(a) copper ||\\//||
, (b) potassium
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(c) nickel
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(d) tungsten - correct answer✔✔(b)
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Thoria is added to tunsten electrodes for what purpose? - correct answer✔✔To increase
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thermionic emission by lowering the work function. ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
True or False? ||\\//|| ||\\//||
All pure metals have the same crystal structure. - correct answer✔✔False. Metals generally
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
have one of three basic structures.
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Which crystal structure(s) is (are) composed of close-packed planes? - correct
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answer✔✔FCC and HCP ||\\//|| ||\\//||
The real strength of metals is lower than the theoretical value because:
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
(a) real crystals always fracture along specific crystal planes.
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(b) grain boundary sliding occurs.
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(c) the presence of dislocations facilitates slip. - correct answer✔✔(c)
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Multiplication and subsequent congestion of moving dislocations causes: ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
(a) elastic extension.
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(b) work or strain hardening.
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(c) a drop in the yield stress. - correct answer✔✔(b)
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Which of the following elements are most likely to form interstitial solid solutions?
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
(a) copper
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(b) nickel
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questions with verified detailed solutions ||\\//|| ||\\//|| ||\\//|| ||\\//||
Which of the following metals has the highest thermal conductivity?
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
(a) carbon steel
||\\//|| ||\\//||
(b) stainless steel
||\\//|| ||\\//||
(c) aluminum - correct answer✔✔(c)
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The Ellingham diagram ||\\//|| ||\\//||
(a) is a plot of thermal conductivity against temperature,
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
(b) shows the free energy of oxide formation against temperature.
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
(c) shows the rate of oxidation of metals against temperature. - correct answer✔✔(b)
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
True or False? ||\\//|| ||\\//||
A metal with a high negative free energy of oxide formation will generally require greater
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
shielding from the atmosphere during welding. - correct answer✔✔True ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Electricity can be conducted by: ||\\//|| ||\\//|| ||\\//|| ||\\//||
(a) atoms and electrons.
||\\//|| ||\\//|| ||\\//||
(b) electrons and ions.
||\\//|| ||\\//|| ||\\//||
(c) only ions. - correct answer✔✔(b)
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Which of the following elements is often present in submerged arc fluxes to improve arc
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
stability?
(a) copper ||\\//||
, (b) potassium
||\\//||
(c) nickel
||\\//||
(d) tungsten - correct answer✔✔(b)
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Thoria is added to tunsten electrodes for what purpose? - correct answer✔✔To increase
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
thermionic emission by lowering the work function. ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
True or False? ||\\//|| ||\\//||
All pure metals have the same crystal structure. - correct answer✔✔False. Metals generally
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
have one of three basic structures.
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Which crystal structure(s) is (are) composed of close-packed planes? - correct
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
answer✔✔FCC and HCP ||\\//|| ||\\//||
The real strength of metals is lower than the theoretical value because:
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
(a) real crystals always fracture along specific crystal planes.
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
(b) grain boundary sliding occurs.
||\\//|| ||\\//|| ||\\//|| ||\\//||
(c) the presence of dislocations facilitates slip. - correct answer✔✔(c)
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Multiplication and subsequent congestion of moving dislocations causes: ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
(a) elastic extension.
||\\//|| ||\\//||
(b) work or strain hardening.
||\\//|| ||\\//|| ||\\//|| ||\\//||
(c) a drop in the yield stress. - correct answer✔✔(b)
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Which of the following elements are most likely to form interstitial solid solutions?
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
(a) copper
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(b) nickel
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