AMPP/NACE CATHODIC PROTECTION TESTER (CP1) EXAMINATION QUESTIONS AND
CORRECT ANSWERS (VERIFIED ANSWERS) PLUS RATIONALES 2026 Q&A | INSTANT
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CORE DOMAINS
Basic Electricity and Electrical Laws
Electrochemistry and Corrosion Theory
Cathodic Protection Concepts and Principles
CP Systems: Galvanic Anode and Impressed Current
CP Field Measurement Techniques and Testing Procedures
INTRODUCTION
,This practice assessment is designed to prepare candidates for the AMPP/NACE Cathodic Protection Tester
(CP1) certification examination. The exam evaluates essential knowledge and practical skills required to test,
evaluate, and determine the effectiveness of cathodic protection systems on buried or submerged metallic
structures. Candidates will encounter multiple-choice and scenario-based questions that test both theoretical
understanding and real-world application. The assessment emphasizes critical decision-making in field testing
situations, proper instrument usage, safety compliance, and adherence to industry standards. Success requires
mastery of fundamental electrical principles, electrochemical corrosion mechanisms, CP system components,
and measurement techniques including pipe-to-soil potential surveys, reference electrode usage, and soil
resistivity testing.
SECTION ONE: QUESTIONS 1–100
Question 1
What is the primary mechanism by which cathodic protection prevents corrosion on a metallic structure?
A. By increasing the oxygen concentration at the metal surface
B. By making the metal surface the anode in an electrochemical cell
C. By making the metal surface the cathode in an electrochemical cell
D. By applying a coating that completely isolates the metal from the environment
🟢 Correct answer
C. By making the metal surface the cathode in an electrochemical cell
,🔴 Explanation: Cathodic protection works by supplying external current to make the protected structure the
cathode, thereby stopping the oxidation (corrosion) reaction that occurs at anodes.
Question 2
According to Ohm's Law, which formula correctly represents the relationship between voltage (V), current (I),
and resistance (R)?
A. V = I/R
B. V = I × R
C. V = R/I
D. V = I² × R
🟢 Correct answer
B. V = I × R
🔴 Explanation: Ohm's Law states that voltage equals current multiplied by resistance (V = IR), which is
fundamental for calculating CP system parameters.
Question 3
In a galvanic corrosion cell, which metal will corrode?
A. The metal with the more positive (cathodic) potential
B. The metal with the more negative (anodic) potential
C. Both metals will corrode at the same rate
D. The metal with higher electrical conductivity
, 🟢 Correct answer
B. The metal with the more negative (anodic) potential
🔴 Explanation: In galvanic corrosion, the anode (more negative potential) undergoes oxidation and corrodes,
while the cathode (more positive potential) is protected.
Question 4
What is the standard reference potential for the Copper/Copper Sulfate (Cu/CuSO₄) reference electrode?
A. -0.440 V
B. -0.760 V
C. -0.316 V
D. -0.850 V
🟢 Correct answer
C. -0.316 V
🔴 Explanation: The Cu/CuSO₄ reference electrode has a standard potential of approximately -0.316 V relative
to the standard hydrogen electrode, commonly used in field CP measurements.
Question 5
Which of the following is NOT a typical component of an impressed current cathodic protection (ICCP) system?
CORRECT ANSWERS (VERIFIED ANSWERS) PLUS RATIONALES 2026 Q&A | INSTANT
DOWNLOAD PDF
CORE DOMAINS
Basic Electricity and Electrical Laws
Electrochemistry and Corrosion Theory
Cathodic Protection Concepts and Principles
CP Systems: Galvanic Anode and Impressed Current
CP Field Measurement Techniques and Testing Procedures
INTRODUCTION
,This practice assessment is designed to prepare candidates for the AMPP/NACE Cathodic Protection Tester
(CP1) certification examination. The exam evaluates essential knowledge and practical skills required to test,
evaluate, and determine the effectiveness of cathodic protection systems on buried or submerged metallic
structures. Candidates will encounter multiple-choice and scenario-based questions that test both theoretical
understanding and real-world application. The assessment emphasizes critical decision-making in field testing
situations, proper instrument usage, safety compliance, and adherence to industry standards. Success requires
mastery of fundamental electrical principles, electrochemical corrosion mechanisms, CP system components,
and measurement techniques including pipe-to-soil potential surveys, reference electrode usage, and soil
resistivity testing.
SECTION ONE: QUESTIONS 1–100
Question 1
What is the primary mechanism by which cathodic protection prevents corrosion on a metallic structure?
A. By increasing the oxygen concentration at the metal surface
B. By making the metal surface the anode in an electrochemical cell
C. By making the metal surface the cathode in an electrochemical cell
D. By applying a coating that completely isolates the metal from the environment
🟢 Correct answer
C. By making the metal surface the cathode in an electrochemical cell
,🔴 Explanation: Cathodic protection works by supplying external current to make the protected structure the
cathode, thereby stopping the oxidation (corrosion) reaction that occurs at anodes.
Question 2
According to Ohm's Law, which formula correctly represents the relationship between voltage (V), current (I),
and resistance (R)?
A. V = I/R
B. V = I × R
C. V = R/I
D. V = I² × R
🟢 Correct answer
B. V = I × R
🔴 Explanation: Ohm's Law states that voltage equals current multiplied by resistance (V = IR), which is
fundamental for calculating CP system parameters.
Question 3
In a galvanic corrosion cell, which metal will corrode?
A. The metal with the more positive (cathodic) potential
B. The metal with the more negative (anodic) potential
C. Both metals will corrode at the same rate
D. The metal with higher electrical conductivity
, 🟢 Correct answer
B. The metal with the more negative (anodic) potential
🔴 Explanation: In galvanic corrosion, the anode (more negative potential) undergoes oxidation and corrodes,
while the cathode (more positive potential) is protected.
Question 4
What is the standard reference potential for the Copper/Copper Sulfate (Cu/CuSO₄) reference electrode?
A. -0.440 V
B. -0.760 V
C. -0.316 V
D. -0.850 V
🟢 Correct answer
C. -0.316 V
🔴 Explanation: The Cu/CuSO₄ reference electrode has a standard potential of approximately -0.316 V relative
to the standard hydrogen electrode, commonly used in field CP measurements.
Question 5
Which of the following is NOT a typical component of an impressed current cathodic protection (ICCP) system?
