NACE CP2 ALL STUDYS ANSWERS AND QUESTIONS
SURE A+
✔✔_______ (an acid salt) used as a fertilizer tends to decrease pH of the soil.
A) calcium sulfate
B) ammonium sulfate
C) carbon sulfate
D) magnesium sulfate - ✔✔b
✔✔_____ in temperature has a depolarizing effect
A) increase
B) decrease - ✔✔a
✔✔When the rate of reduction reaction is ____, it ____ the level of polarization and
_____ the cathodic protection current requirement
A) increased, increases, increases
B) increased, decreases, decreases
C) increased, decreases, increases
D) decreased, increases, decreases
E) decreased, decreases, decreases - ✔✔c
✔✔Increased temperature will ____ ionization
A) increase
B) decrease - ✔✔a
✔✔As ionization _____,
the electrolyte's conductivity _____, which _____ corrosion current and
the amount of cathodic protection current required for adequate protection.
A) increases, increases, increases
,B) increases, decreases, decreases
C) increases, decreases, increases
D) decreases, increases, decreases
E) decreases, decreases, decreases - ✔✔a
✔✔Oxygen or other oxidizers ____ the current requirements as a result of
flattening the cathodic polarization slope
A) increase
B) decrease - ✔✔a
✔✔True or False (t or f)
structures in well aerated soils, such as sand and gravel, require
more cathodic protection current than structures surrounded by relatively
deaerated soils, such as clay. - ✔✔t
✔✔A(n) _____ in the relative movement between the electrolyte and the structure
causes a(n) _____ in current requirement
A) increase, decrease
B) increase, increase
C) decrease, increase
D) decrease, decrease - ✔✔b
✔✔True or False (t or f)
a ship under way requires less cathodic protection current than a
ship at rest - ✔✔f
✔✔To reduce the residual corrosion current to zero, cathodic protection current
must be _______
A) disproportionately increased
B) disproportionately decreased
C) proportionately increased
D) proportionately decreased - ✔✔a
✔✔The relationship between applied cathodic protection current and corrosion rate is
____
A) proportional
B) disproportional
C) logarithmic - ✔✔c
,✔✔In regards to amphoteric metals:
The formation of ____ ions at the cathode causes the pH of the electrolyte next to
the cathode to become ____.
A) hydroxyl, aciditic
B) hydrogen, aciditic
C) hydroxyl, aciditic
D) hydroxyl, alkaline - ✔✔d
✔✔For pipeline coatings, polarized
potential values more negative than ____ mV CSE should be avoided.
A) -1000
B) -1500
C) -1200
D) -850 - ✔✔c
✔✔Control of External Corrosion on Underground or Submerged
Metallic Piping Systems
A) SP0170
B) SP0169
C) SP0007
D)SP0175 - ✔✔b
✔✔True or False (t or f)
The potential of interest when determining adequate cathodic protection is the
polarized potential across the structure/electrolyte interface - ✔✔t
✔✔Figure 2.15
E true =
A) Structure to electrolyte potential
B) Reference-to-earth resistance
C) Pipe-to-earth resistance - ✔✔a
✔✔Figure 2.15
R r,e =
A) Structure to electrolyte potential
B) Reference-to-earth resistance
C) Pipe-to-earth resistance - ✔✔b
, ✔✔Figure 2.15
R p,e =
A) Structure to electrolyte potential
B) Reference-to-earth resistance
C) Pipe-to-earth resistance - ✔✔c
✔✔Figure 2.15 (a) Electrical Schematic of the Structure to Electrolyte Measurement
Circuit
A) Vm = Rm/Rt * Etrue
B) Vm= Rt/Rm * Etrue
C) Vm = Rt/Etrue * Rm
D) Vm = Rm/Etrue *Rm - ✔✔a
✔✔Do you want high or low impedance on your internal circuit of your meter?
A) low
B) high - ✔✔b
✔✔The IR drop across the electrolyte can be reduced to near zero by placing the
reference electrode ____ the structure coating holiday or by ____ the current flow
A) far, allowing
B) near, interrupting - ✔✔b
✔✔The criterion for cathodically protecting aluminum based on NACE Standard
SP0169 is a minimum of ___ mV of polarization as measured between the structure
surface and a stable reference electrode contacting the electrolyte.
A) 50
B) 75
C) 100
D) 25 - ✔✔c
✔✔True or false (t or f)
Aluminum is NOT amphoteric - ✔✔f
✔✔Aluminum corrodes under ____ conditions
A) both acid and alkaline
B) acidic only
C) alkaline only - ✔✔a
SURE A+
✔✔_______ (an acid salt) used as a fertilizer tends to decrease pH of the soil.
A) calcium sulfate
B) ammonium sulfate
C) carbon sulfate
D) magnesium sulfate - ✔✔b
✔✔_____ in temperature has a depolarizing effect
A) increase
B) decrease - ✔✔a
✔✔When the rate of reduction reaction is ____, it ____ the level of polarization and
_____ the cathodic protection current requirement
A) increased, increases, increases
B) increased, decreases, decreases
C) increased, decreases, increases
D) decreased, increases, decreases
E) decreased, decreases, decreases - ✔✔c
✔✔Increased temperature will ____ ionization
A) increase
B) decrease - ✔✔a
✔✔As ionization _____,
the electrolyte's conductivity _____, which _____ corrosion current and
the amount of cathodic protection current required for adequate protection.
A) increases, increases, increases
,B) increases, decreases, decreases
C) increases, decreases, increases
D) decreases, increases, decreases
E) decreases, decreases, decreases - ✔✔a
✔✔Oxygen or other oxidizers ____ the current requirements as a result of
flattening the cathodic polarization slope
A) increase
B) decrease - ✔✔a
✔✔True or False (t or f)
structures in well aerated soils, such as sand and gravel, require
more cathodic protection current than structures surrounded by relatively
deaerated soils, such as clay. - ✔✔t
✔✔A(n) _____ in the relative movement between the electrolyte and the structure
causes a(n) _____ in current requirement
A) increase, decrease
B) increase, increase
C) decrease, increase
D) decrease, decrease - ✔✔b
✔✔True or False (t or f)
a ship under way requires less cathodic protection current than a
ship at rest - ✔✔f
✔✔To reduce the residual corrosion current to zero, cathodic protection current
must be _______
A) disproportionately increased
B) disproportionately decreased
C) proportionately increased
D) proportionately decreased - ✔✔a
✔✔The relationship between applied cathodic protection current and corrosion rate is
____
A) proportional
B) disproportional
C) logarithmic - ✔✔c
,✔✔In regards to amphoteric metals:
The formation of ____ ions at the cathode causes the pH of the electrolyte next to
the cathode to become ____.
A) hydroxyl, aciditic
B) hydrogen, aciditic
C) hydroxyl, aciditic
D) hydroxyl, alkaline - ✔✔d
✔✔For pipeline coatings, polarized
potential values more negative than ____ mV CSE should be avoided.
A) -1000
B) -1500
C) -1200
D) -850 - ✔✔c
✔✔Control of External Corrosion on Underground or Submerged
Metallic Piping Systems
A) SP0170
B) SP0169
C) SP0007
D)SP0175 - ✔✔b
✔✔True or False (t or f)
The potential of interest when determining adequate cathodic protection is the
polarized potential across the structure/electrolyte interface - ✔✔t
✔✔Figure 2.15
E true =
A) Structure to electrolyte potential
B) Reference-to-earth resistance
C) Pipe-to-earth resistance - ✔✔a
✔✔Figure 2.15
R r,e =
A) Structure to electrolyte potential
B) Reference-to-earth resistance
C) Pipe-to-earth resistance - ✔✔b
, ✔✔Figure 2.15
R p,e =
A) Structure to electrolyte potential
B) Reference-to-earth resistance
C) Pipe-to-earth resistance - ✔✔c
✔✔Figure 2.15 (a) Electrical Schematic of the Structure to Electrolyte Measurement
Circuit
A) Vm = Rm/Rt * Etrue
B) Vm= Rt/Rm * Etrue
C) Vm = Rt/Etrue * Rm
D) Vm = Rm/Etrue *Rm - ✔✔a
✔✔Do you want high or low impedance on your internal circuit of your meter?
A) low
B) high - ✔✔b
✔✔The IR drop across the electrolyte can be reduced to near zero by placing the
reference electrode ____ the structure coating holiday or by ____ the current flow
A) far, allowing
B) near, interrupting - ✔✔b
✔✔The criterion for cathodically protecting aluminum based on NACE Standard
SP0169 is a minimum of ___ mV of polarization as measured between the structure
surface and a stable reference electrode contacting the electrolyte.
A) 50
B) 75
C) 100
D) 25 - ✔✔c
✔✔True or false (t or f)
Aluminum is NOT amphoteric - ✔✔f
✔✔Aluminum corrodes under ____ conditions
A) both acid and alkaline
B) acidic only
C) alkaline only - ✔✔a
