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CWB WELDING INSPECTOR LEVEL 3 EXAM
NEWEST ACTUAL EXAM COMPLETE QUESTIONS
AND CORRECT DETAILED ANSWERS
Which of the following metals has the highest thermal
conductivity?
(a) carbon steel
(b) stainless steel
(c) aluminum - .....ANSWER ...✔✔ (c)
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. - .....ANSWER ...✔✔ (b)
True or False?
A metal with a high negative free energy of oxide
formation will generally require greater shielding from
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the atmosphere during welding. - .....ANSWER ...✔✔
True
Electricity can be conducted by:
(a) atoms and electrons.
(b) electrons and ions.
(c) only ions. - .....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 - .....ANSWER ...✔✔ (b)
Thoria is added to tunsten electrodes for what purpose?
- .....ANSWER ...✔✔ To increase thermionic emission
by lowering the work function.
True or False?
All pure metals have the same crystal structure. -
.....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? - .....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. -
.....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. - .....ANSWER ...✔✔ (b)
Which of the following elements are most likely to form
interstitial solid solutions?
(a) copper
(b) nickel
(c) carbon - .....ANSWER ...✔✔ (c)
CWB WELDING INSPECTOR LEVEL 3 EXAM
NEWEST ACTUAL EXAM COMPLETE QUESTIONS
AND CORRECT DETAILED ANSWERS
Which of the following metals has the highest thermal
conductivity?
(a) carbon steel
(b) stainless steel
(c) aluminum - .....ANSWER ...✔✔ (c)
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. - .....ANSWER ...✔✔ (b)
True or False?
A metal with a high negative free energy of oxide
formation will generally require greater shielding from
,2|Page
the atmosphere during welding. - .....ANSWER ...✔✔
True
Electricity can be conducted by:
(a) atoms and electrons.
(b) electrons and ions.
(c) only ions. - .....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 - .....ANSWER ...✔✔ (b)
Thoria is added to tunsten electrodes for what purpose?
- .....ANSWER ...✔✔ To increase thermionic emission
by lowering the work function.
True or False?
All pure metals have the same crystal structure. -
.....ANSWER ...✔✔ False. Metals generally have one
of three basic structures.
, 3|Page
Which crystal structure(s) is (are) composed of close-
packed planes? - .....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. -
.....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. - .....ANSWER ...✔✔ (b)
Which of the following elements are most likely to form
interstitial solid solutions?
(a) copper
(b) nickel
(c) carbon - .....ANSWER ...✔✔ (c)
