CWB Welding Inspector Level III Study Guide With
complete ques ons and answers NEW EDITION RATED
A+ 100% VERIFIED CORRECT
Which of the following metals has the highest thermal conduc vity?
(a) carbon steel
(b) stainless steel
(c) aluminum - Ans (c)
The Ellingham diagram
(a) is a plot of thermal conduc vity against temperature,
(b) shows the free energy of oxide forma on against temperature.
(c) shows the rate of oxida on of metals against temperature. - Ans (b)
True or False?
A metal with a high nega ve free energy of oxide forma on will generally require greater
shielding from the atmosphere during welding. - Ans True
Electricity can be conducted by:
(a) atoms and electrons.
(b) electrons and ions.
(c) only ions. - Ans (b)
Which of the following elements is o&en present in submerged arc fluxes to improve arc
stability?
(a) copper
, (b) potassium
(c) nickel
(d) tungsten - Ans (b)
Thoria is added to tunsten electrodes for what purpose? - Ans To increase thermionic emission
by lowering the work func on.
True or False?
All pure metals have the same crystal structure. - Ans False. Metals generally have one of three
basic structures.
Which crystal structure(s) is (are) composed of close-packed planes? - Ans FCC and HCP
The real strength of metals is lower than the theore cal value because:
(a) real crystals always fracture along specific crystal planes.
(b) grain boundary sliding occurs.
(c) the presence of disloca ons facilitates slip. - Ans (c)
Mul plica on and subsequent conges on of moving disloca ons causes:
(a) elas c extension.
(b) work or strain hardening.
(c) a drop in the yield stress. - Ans (b)
Which of the following elements are most likely to form inters al solid solu ons?
(a) copper
(b) nickel
(c) carbon - Ans (c)
complete ques ons and answers NEW EDITION RATED
A+ 100% VERIFIED CORRECT
Which of the following metals has the highest thermal conduc vity?
(a) carbon steel
(b) stainless steel
(c) aluminum - Ans (c)
The Ellingham diagram
(a) is a plot of thermal conduc vity against temperature,
(b) shows the free energy of oxide forma on against temperature.
(c) shows the rate of oxida on of metals against temperature. - Ans (b)
True or False?
A metal with a high nega ve free energy of oxide forma on will generally require greater
shielding from the atmosphere during welding. - Ans True
Electricity can be conducted by:
(a) atoms and electrons.
(b) electrons and ions.
(c) only ions. - Ans (b)
Which of the following elements is o&en present in submerged arc fluxes to improve arc
stability?
(a) copper
, (b) potassium
(c) nickel
(d) tungsten - Ans (b)
Thoria is added to tunsten electrodes for what purpose? - Ans To increase thermionic emission
by lowering the work func on.
True or False?
All pure metals have the same crystal structure. - Ans False. Metals generally have one of three
basic structures.
Which crystal structure(s) is (are) composed of close-packed planes? - Ans FCC and HCP
The real strength of metals is lower than the theore cal value because:
(a) real crystals always fracture along specific crystal planes.
(b) grain boundary sliding occurs.
(c) the presence of disloca ons facilitates slip. - Ans (c)
Mul plica on and subsequent conges on of moving disloca ons causes:
(a) elas c extension.
(b) work or strain hardening.
(c) a drop in the yield stress. - Ans (b)
Which of the following elements are most likely to form inters al solid solu ons?
(a) copper
(b) nickel
(c) carbon - Ans (c)
