NACE CP2 Student Manual Chapter 5 Stray
Currents Latest Update 2025-2026 Actual 80
Exam Questions with 100% Verified Correct
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Professor
___ stray current can be both a safety hazard and a corrosion problem, ___ stray
current causes significant corrosion of most metals.
A) DC , DC
B) AC, DC
C) DC, AC - CORRECT ANSWER: b
____ uses a long term way of recording stray current magnitude over time.
A) Rectifier timer
B) Stripe Anode
C) Current interrupter
D) Data logger - CORRECT ANSWER: d
_____ currents are naturally occurring stray currents that are caused by disturbances in
the Earth's magnetic field by sun spot activity.
A) natural (telluric) currents
B) static (steady state) currents
C) dynamic currents - CORRECT ANSWER: a
,_____ is where AC power is transmitted to ground the underground structure.
A) electrostatic coupling
B) Resistive coupling
C) Electromagnetic induction - CORRECT ANSWER: b
_____ is where the structure acts as one side of a capacitor with respect to ground, only
concern when the structure is _____.
A) electrostatic coupling ,above grade
B) Resistive coupling, below ground
C) Electromagnetic induction, below ground - CORRECT ANSWER: a
______ allows us to relate the corrosion lost to the amount of
current discharged.
A) Faraday's Law
B) Ohm's Law
C) Kirchoff's Law - CORRECT ANSWER: a
_______ , where the structure acts as the single-turn secondary of an air-core
transformer in which the overhead power line is
the primary, this type of induction may occur when the structure is _____ .
A) electrostatic coupling ,above grade
B) Resistive coupling, below ground
C) Electromagnetic induction, above or below ground
, D) electromagnetic induction, below ground - CORRECT ANSWER: c
_______ are available that block the low-potential DC cathodic protection current from
leaking across an insulating device while still providing instant protection from high-
voltage spikes and _____.
A) polarization cell, induced AC
B) solid state devices, induced AC
C) polarization cell, conducted AC
D) solid state devices, induced DC - CORRECT ANSWER: b
________ are currents through electrical paths other than the intended circuit.
A) Eddy currents
B) Stray currents
C) Direct currents
D) Alternating currents - CORRECT ANSWER: b
1 A DC discharge results in a loss of approximately ___lbs of steel in one year, while
one ampere of AC would consume less than__ lb.
A) 20, 1
B) 1, 20
C) 10, 5
D) 20, 5 - CORRECT ANSWER: a
A metallic bond may not perform properly in the case of a cathodically protected ______
that is causing interference on a _____ pipeline.
Currents Latest Update 2025-2026 Actual 80
Exam Questions with 100% Verified Correct
Answers with Guaranteed A+ Verified by
Professor
___ stray current can be both a safety hazard and a corrosion problem, ___ stray
current causes significant corrosion of most metals.
A) DC , DC
B) AC, DC
C) DC, AC - CORRECT ANSWER: b
____ uses a long term way of recording stray current magnitude over time.
A) Rectifier timer
B) Stripe Anode
C) Current interrupter
D) Data logger - CORRECT ANSWER: d
_____ currents are naturally occurring stray currents that are caused by disturbances in
the Earth's magnetic field by sun spot activity.
A) natural (telluric) currents
B) static (steady state) currents
C) dynamic currents - CORRECT ANSWER: a
,_____ is where AC power is transmitted to ground the underground structure.
A) electrostatic coupling
B) Resistive coupling
C) Electromagnetic induction - CORRECT ANSWER: b
_____ is where the structure acts as one side of a capacitor with respect to ground, only
concern when the structure is _____.
A) electrostatic coupling ,above grade
B) Resistive coupling, below ground
C) Electromagnetic induction, below ground - CORRECT ANSWER: a
______ allows us to relate the corrosion lost to the amount of
current discharged.
A) Faraday's Law
B) Ohm's Law
C) Kirchoff's Law - CORRECT ANSWER: a
_______ , where the structure acts as the single-turn secondary of an air-core
transformer in which the overhead power line is
the primary, this type of induction may occur when the structure is _____ .
A) electrostatic coupling ,above grade
B) Resistive coupling, below ground
C) Electromagnetic induction, above or below ground
, D) electromagnetic induction, below ground - CORRECT ANSWER: c
_______ are available that block the low-potential DC cathodic protection current from
leaking across an insulating device while still providing instant protection from high-
voltage spikes and _____.
A) polarization cell, induced AC
B) solid state devices, induced AC
C) polarization cell, conducted AC
D) solid state devices, induced DC - CORRECT ANSWER: b
________ are currents through electrical paths other than the intended circuit.
A) Eddy currents
B) Stray currents
C) Direct currents
D) Alternating currents - CORRECT ANSWER: b
1 A DC discharge results in a loss of approximately ___lbs of steel in one year, while
one ampere of AC would consume less than__ lb.
A) 20, 1
B) 1, 20
C) 10, 5
D) 20, 5 - CORRECT ANSWER: a
A metallic bond may not perform properly in the case of a cathodically protected ______
that is causing interference on a _____ pipeline.
