NACE CP2 Student Manual Chapter 5 Stray 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.
- Rectifier timer
- Stripe Anode
- 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.
- natural (telluric) currents
- static (steady state) currents
C) dynamic currents - CORRECT ANSWER: a
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_____ is where AC power is transmitted to ground the underground structure.
- electrostatic coupling
- 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 _____.
- electrostatic coupling ,above grade
- 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.
- Faraday's Law
- 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 _____ .
- electrostatic coupling ,above grade
- Resistive coupling, below ground
- Electromagnetic induction, above or below ground 2 / 3
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 _____.
- polarization cell, induced AC
- solid state devices, induced AC
- polarization cell, conducted AC
D) solid state devices, induced DC - CORRECT ANSWER: b
________ are currents through electrical paths other than the intended circuit.
- Eddy currents
- Stray currents
- Direct currents
D) Alternating currents - CORRECT ANSWER: b
- 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.
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