CWB Welding Inspector Level III Study
Guide Exam Questions and Answes
100% Pass
Which of the following metals has the highest thermal conductivity?
(a) carbon steel
(b) stainless steel
(c) aluminum - ✔✔(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. - ✔✔(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. - ✔✔True
Electricity can be conducted by:
(a) atoms and electrons.
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, (b) electrons and ions.
(c) only ions. - ✔✔(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 - ✔✔(b)
Thoria is added to tunsten electrodes for what purpose? - ✔✔To increase
thermionic emission by lowering the work function.
True or False?
All pure metals have the same crystal structure. - ✔✔False. Metals
generally have one of three basic structures.
Which crystal structure(s) is (are) composed of close-packed planes? -
✔✔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. - ✔✔(c)
2
©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.
Guide Exam Questions and Answes
100% Pass
Which of the following metals has the highest thermal conductivity?
(a) carbon steel
(b) stainless steel
(c) aluminum - ✔✔(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. - ✔✔(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. - ✔✔True
Electricity can be conducted by:
(a) atoms and electrons.
1
©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.
, (b) electrons and ions.
(c) only ions. - ✔✔(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 - ✔✔(b)
Thoria is added to tunsten electrodes for what purpose? - ✔✔To increase
thermionic emission by lowering the work function.
True or False?
All pure metals have the same crystal structure. - ✔✔False. Metals
generally have one of three basic structures.
Which crystal structure(s) is (are) composed of close-packed planes? -
✔✔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. - ✔✔(c)
2
©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.
