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ICC U4 UST Cathodic Protection (CP) Certification
Examination | Latest Verified Questions and Detailed
Answers
OVERVIEW DESCRIPTION:
This comprehensive set of multiple choice questions is designed for the ICC U4 UST
Cathodic Protection (CP) examination, a closed-book certification test administered by the
International Code Council (ICC). The exam evaluates a candidate’s expertise in designing,
installing, testing, and maintaining both galvanic and impressed current cathodic
protection systems for underground storage tanks. Core content includes corrosion
electrochemistry, system components, reference electrode use, industry-accepted
protection criteria (such as -0.85 V polarized potential and 100 mV polarization decay),
stray current detection and mitigation, rectifier inspections, troubleshooting, and
compliance record-keeping, grounded in standards like NACE SP0285, PEI RP100, and EPA
guidance.
QUESTION 1
In an electrochemical corrosion cell, which process occurs at the anode?
A) Reduction
B) Oxidation
C) Ion migration
D) Passivation
CORRECT ANSWER: B
EXPERT RATIONALE: The anode is where oxidation takes place; metal atoms lose
electrons and enter the electrolyte as ions.
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QUESTION 2
What is the primary function of the electrolyte in a corrosion cell?
A) To provide a path for electronic conduction
B) To supply oxygen for reduction
C) To conduct ionic current between anode and cathode
D) To act as a reference potential
CORRECT ANSWER: C
EXPERT RATIONALE: The electrolyte conducts ionic current, completing the electrical
circuit between the anodic and cathodic sites.
QUESTION 3
Which of the following metals would serve as a sacrificial anode for steel in soil?
A) Copper
B) Zinc
C) Stainless steel
D) Brass
CORRECT ANSWER: B
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EXPERT RATIONALE: Zinc is more negative than steel in the galvanic series and corrodes
preferentially, protecting the steel.
QUESTION 4
In the electrochemical series, which property determines if one metal will protect
another galvanically?
A) Resistivity
B) Density
C) Electrode potential
D) Hardness
CORRECT ANSWER: C
EXPERT RATIONALE: A metal with a more negative electrode potential acts as an anode,
sacrificing itself to protect a more cathodic metal.
QUESTION 5
A galvanic cathodic protection system for an underground storage tank relies on:
A) An external DC power supply
B) The natural potential difference between dissimilar metals
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C) Periodic recharging of the anode
D) Chemical inhibitors added to soil
CORRECT ANSWER: B
EXPERT RATIONALE: Galvanic systems use the natural voltage difference between the
sacrificial anode and the protected structure to drive protective current.
QUESTION 6
What is the typical backfill material surrounding a magnesium anode in soil?
A) Clean sand
B) 75% gypsum, 20% bentonite, 5% sodium sulfate
C) 100% bentonite clay
D) Crushed limestone
CORRECT ANSWER: B
EXPERT RATIONALE: This mixture absorbs water, reduces anode resistance, and ensures
uniform consumption of the anode.
QUESTION 7
ICC U4 UST Cathodic Protection (CP) Certification
Examination | Latest Verified Questions and Detailed
Answers
OVERVIEW DESCRIPTION:
This comprehensive set of multiple choice questions is designed for the ICC U4 UST
Cathodic Protection (CP) examination, a closed-book certification test administered by the
International Code Council (ICC). The exam evaluates a candidate’s expertise in designing,
installing, testing, and maintaining both galvanic and impressed current cathodic
protection systems for underground storage tanks. Core content includes corrosion
electrochemistry, system components, reference electrode use, industry-accepted
protection criteria (such as -0.85 V polarized potential and 100 mV polarization decay),
stray current detection and mitigation, rectifier inspections, troubleshooting, and
compliance record-keeping, grounded in standards like NACE SP0285, PEI RP100, and EPA
guidance.
QUESTION 1
In an electrochemical corrosion cell, which process occurs at the anode?
A) Reduction
B) Oxidation
C) Ion migration
D) Passivation
CORRECT ANSWER: B
EXPERT RATIONALE: The anode is where oxidation takes place; metal atoms lose
electrons and enter the electrolyte as ions.
,2|Page
QUESTION 2
What is the primary function of the electrolyte in a corrosion cell?
A) To provide a path for electronic conduction
B) To supply oxygen for reduction
C) To conduct ionic current between anode and cathode
D) To act as a reference potential
CORRECT ANSWER: C
EXPERT RATIONALE: The electrolyte conducts ionic current, completing the electrical
circuit between the anodic and cathodic sites.
QUESTION 3
Which of the following metals would serve as a sacrificial anode for steel in soil?
A) Copper
B) Zinc
C) Stainless steel
D) Brass
CORRECT ANSWER: B
,3|Page
EXPERT RATIONALE: Zinc is more negative than steel in the galvanic series and corrodes
preferentially, protecting the steel.
QUESTION 4
In the electrochemical series, which property determines if one metal will protect
another galvanically?
A) Resistivity
B) Density
C) Electrode potential
D) Hardness
CORRECT ANSWER: C
EXPERT RATIONALE: A metal with a more negative electrode potential acts as an anode,
sacrificing itself to protect a more cathodic metal.
QUESTION 5
A galvanic cathodic protection system for an underground storage tank relies on:
A) An external DC power supply
B) The natural potential difference between dissimilar metals
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C) Periodic recharging of the anode
D) Chemical inhibitors added to soil
CORRECT ANSWER: B
EXPERT RATIONALE: Galvanic systems use the natural voltage difference between the
sacrificial anode and the protected structure to drive protective current.
QUESTION 6
What is the typical backfill material surrounding a magnesium anode in soil?
A) Clean sand
B) 75% gypsum, 20% bentonite, 5% sodium sulfate
C) 100% bentonite clay
D) Crushed limestone
CORRECT ANSWER: B
EXPERT RATIONALE: This mixture absorbs water, reduces anode resistance, and ensures
uniform consumption of the anode.
QUESTION 7
