NACE CP2 FINAL TEST 2026
QUESTIONS WITH CORRECT
ANSWERS GRADED A+
◍ A structure-to-electrolyte potential measures the potential difference
between
A. Two different structures acting as electrodes
B. The structure and a standard reference electrode
C. The structure and the anodes
D. Two different points on the structure.
Answer: B. The structure and a standard reference electrode
◍ If 5.0 A of battery current passes through the outside leads of a 4-wire
current span spaced at 30 m (100 ft), resulting in a voltage drop of 5.0 mV
with the test current applied and of 1 mV without the test current, what is a
the calibration factor of the current span?
A. 0.00025 A/mV
B. 4.0 A/mV
C. 1.25 A/mV
D. 5.0 A/mV.
Answer: C. 1.25 A/mVI = 5 A EC = 5 mV ENC = 1 mVK = I/(EC - ENC) =
5 A/(5 mV - 1 mV) = 1.25 A/mV
◍ ________ are currents through electrical paths other than the intended
circuit.A) Eddy currentsB) Stray currentsC) Direct currentsD) Alternating
currents.
Answer: b
◍ A mitigation control bond should be designed to ______. (select all that
apply)A) carry the necessary currentB) restrict the current to the level
required to mitigate the problemC) keep the current going in one direction if
, necessaryD) return the portion on the interfered with structure to its
pre-interference state.
Answer: a, b, c, d
◍ A mitigation bond may cause more problems under which of the following
conditions? (select all that apply)A) where the interfering structure bond
point is more electropositive than the interfered with structure. B) where the
interfering structure bond point is more electronegative than the interfered
with structureC) where there are more than one, or changing current
discharge pointsD) where the interfering structure bond point potential
varies from being more electronegative to more electropositive than the
interfered with structure..
Answer: a, c, d
◍ Polarization is determined by
A. Subtracting the ON from the instant OFF potential
B. Measuring the instant OFF potential
C. Subtracting the instant OFF from the Native (free corroding) potential
D. Substracting the IR drop from the ON potential.
Answer: C. Subtracting the instant OFF from the Native (free corroding)
potential
◍ AC voltages on pipelines do NOT result from:A) resistive (conductive)
couplingB) electrostatic (capacitive) couplingC) electromagnetic induction
couplingD) thermodynamic coupling.
Answer: d
◍ Current pickup on a pipeline is indicated when
A. The structure-to-electrolyte potential over the pipe is more
electronegative than each side
B. The structure-to-electrolyte potential over the pipe is more electropositive
than each side
C. The two electrode method (side drain) shows the electrode over the pipe
is more electropositive
D. A CIS shows a more electropositive potential with the rectifier ON than
, OFF.
Answer: B. The structure-to-electrolyte potential over the pipe is more
electropositive than each side
◍ A 61 cm diameter (24 in) pipe has a current span at each end of a 2 km (1.24
miles) section with the following information determined:EONts1 = -1200
mVcse EONts2 = -1140 mVcseEOFFts1 = -1000 mVcse EOFFts2 = -980
mVcseIONts1 = 3 A IONts2 = 2.8 AIOFFts1 = 0.2 A IOFFts2 - = 0.2
AWhat is the pipe-to-earth resistance (ohm)?
A. 0.9 ohm
B. 9 ohm
C. 66.7 ohm
D. 900 ohm.
Answer: A. 0.9 ohmRc = DeltaE/IcIc = Delta1ts1 - DeltaIts2 = (3 - 0.2) -
(2.8 - 0.2)Ic = 0.2 ADeltaE = (DeltaEts1 - DeltaEts2)/2DeltaE =
((1200-1000)+(1140-980))/2 = 180 mVRc = 180 mV/0.2 A = 0.9 ohm
◍ On a cathodically protected pipeline, AC corrosion can be expected at which
current densities? (select all that apply)A) 30 mA/m^2B) 10 A/m^2C) 110
A/m^2D) 200 A/m^2.
Answer: c, d
◍ The AC voltage-to-ground on a section of pipeline near a powerline tends to
be __________.A) highest where the power line and pipeline crossB)
highest where the power line and pipeline separate after a parallel sectionC)
highest at the ends of the overall pipeline with the parallel section in the
middleD) the same along the pipeline/power line parallel section.
Answer: b
◍ Methods of making hazardous AC voltages safe include installing which of
the following? (select all that apply)A) grounds at the discontinuities
between powerline and B) a bond to the steal powerline towerC) a gradient
mat or a grid around above ground structuresD) a remote ground away from
the parallel section.
Answer: a, c
QUESTIONS WITH CORRECT
ANSWERS GRADED A+
◍ A structure-to-electrolyte potential measures the potential difference
between
A. Two different structures acting as electrodes
B. The structure and a standard reference electrode
C. The structure and the anodes
D. Two different points on the structure.
Answer: B. The structure and a standard reference electrode
◍ If 5.0 A of battery current passes through the outside leads of a 4-wire
current span spaced at 30 m (100 ft), resulting in a voltage drop of 5.0 mV
with the test current applied and of 1 mV without the test current, what is a
the calibration factor of the current span?
A. 0.00025 A/mV
B. 4.0 A/mV
C. 1.25 A/mV
D. 5.0 A/mV.
Answer: C. 1.25 A/mVI = 5 A EC = 5 mV ENC = 1 mVK = I/(EC - ENC) =
5 A/(5 mV - 1 mV) = 1.25 A/mV
◍ ________ are currents through electrical paths other than the intended
circuit.A) Eddy currentsB) Stray currentsC) Direct currentsD) Alternating
currents.
Answer: b
◍ A mitigation control bond should be designed to ______. (select all that
apply)A) carry the necessary currentB) restrict the current to the level
required to mitigate the problemC) keep the current going in one direction if
, necessaryD) return the portion on the interfered with structure to its
pre-interference state.
Answer: a, b, c, d
◍ A mitigation bond may cause more problems under which of the following
conditions? (select all that apply)A) where the interfering structure bond
point is more electropositive than the interfered with structure. B) where the
interfering structure bond point is more electronegative than the interfered
with structureC) where there are more than one, or changing current
discharge pointsD) where the interfering structure bond point potential
varies from being more electronegative to more electropositive than the
interfered with structure..
Answer: a, c, d
◍ Polarization is determined by
A. Subtracting the ON from the instant OFF potential
B. Measuring the instant OFF potential
C. Subtracting the instant OFF from the Native (free corroding) potential
D. Substracting the IR drop from the ON potential.
Answer: C. Subtracting the instant OFF from the Native (free corroding)
potential
◍ AC voltages on pipelines do NOT result from:A) resistive (conductive)
couplingB) electrostatic (capacitive) couplingC) electromagnetic induction
couplingD) thermodynamic coupling.
Answer: d
◍ Current pickup on a pipeline is indicated when
A. The structure-to-electrolyte potential over the pipe is more
electronegative than each side
B. The structure-to-electrolyte potential over the pipe is more electropositive
than each side
C. The two electrode method (side drain) shows the electrode over the pipe
is more electropositive
D. A CIS shows a more electropositive potential with the rectifier ON than
, OFF.
Answer: B. The structure-to-electrolyte potential over the pipe is more
electropositive than each side
◍ A 61 cm diameter (24 in) pipe has a current span at each end of a 2 km (1.24
miles) section with the following information determined:EONts1 = -1200
mVcse EONts2 = -1140 mVcseEOFFts1 = -1000 mVcse EOFFts2 = -980
mVcseIONts1 = 3 A IONts2 = 2.8 AIOFFts1 = 0.2 A IOFFts2 - = 0.2
AWhat is the pipe-to-earth resistance (ohm)?
A. 0.9 ohm
B. 9 ohm
C. 66.7 ohm
D. 900 ohm.
Answer: A. 0.9 ohmRc = DeltaE/IcIc = Delta1ts1 - DeltaIts2 = (3 - 0.2) -
(2.8 - 0.2)Ic = 0.2 ADeltaE = (DeltaEts1 - DeltaEts2)/2DeltaE =
((1200-1000)+(1140-980))/2 = 180 mVRc = 180 mV/0.2 A = 0.9 ohm
◍ On a cathodically protected pipeline, AC corrosion can be expected at which
current densities? (select all that apply)A) 30 mA/m^2B) 10 A/m^2C) 110
A/m^2D) 200 A/m^2.
Answer: c, d
◍ The AC voltage-to-ground on a section of pipeline near a powerline tends to
be __________.A) highest where the power line and pipeline crossB)
highest where the power line and pipeline separate after a parallel sectionC)
highest at the ends of the overall pipeline with the parallel section in the
middleD) the same along the pipeline/power line parallel section.
Answer: b
◍ Methods of making hazardous AC voltages safe include installing which of
the following? (select all that apply)A) grounds at the discontinuities
between powerline and B) a bond to the steal powerline towerC) a gradient
mat or a grid around above ground structuresD) a remote ground away from
the parallel section.
Answer: a, c
