Cathodic Protection Tester Certification
Examiner Certification Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1.A cathodic protection system is primarily designed to protect metallic
structures from corrosion by which mechanism?
A. Increasing the acidity of the surrounding electrolyte
B. Making the protected metal the cathode of an electrochemical cell
C. Removing all moisture from the environment
D. Coating the metal with a conductive material
Correct answer: B
Cathodic protection works by forcing the protected structure to become
the cathode in an electrochemical reaction, preventing it from losing
electrons and undergoing oxidation (corrosion).
2. Which type of corrosion control method uses an external DC power
source and impressed current anodes?
A. Galvanic cathodic protection
B. Passive corrosion protection
C. Impressed current cathodic protection
D. Chemical inhibition
Correct answer: C
,Impressed current cathodic protection systems use an external power
supply to drive current from anodes to the structure, providing controlled
corrosion protection.
3. In a cathodic protection system, corrosion occurs primarily at which
location of an electrochemical cell?
A. Cathode
B. Anode
C. Electrolyte
D. Reference electrode
Correct answer: B
The anode is the area where metal oxidation occurs because it releases
electrons into the electrochemical circuit, resulting in corrosion.
4. Which instrument is commonly used by a cathodic protection tester to
measure structure-to-electrolyte potentials?
A. Clamp meter
B. Pipe locator
C. Digital voltmeter
D. Insulation tester
Correct answer: C
A high-impedance digital voltmeter is used to measure cathodic protection
potentials accurately without significantly affecting the circuit.
5. What is the purpose of a copper/copper sulfate reference electrode in
cathodic protection testing?
A. To supply protective current
B. To measure soil resistivity
C. To provide a stable reference potential for measurements
D. To increase anode efficiency
,Correct answer: C
A copper/copper sulfate reference electrode provides a known and stable
electrical potential against which structure potentials can be measured.
6. The commonly accepted minimum protection criterion for steel
structures using a copper/copper sulfate reference electrode is
approximately:
A. +500 mV
B. -850 mV
C. -100 mV
D. +50 mV
Correct answer: B
A potential of approximately -850 mV or more negative relative to a
copper/copper sulfate electrode is commonly used as a cathodic protection
criterion for steel.
7. What is the main purpose of measuring “instant-off” potentials during
cathodic protection testing?
A. To measure coating thickness
B. To eliminate voltage drop errors caused by current flow
C. To determine pipe diameter
D. To calculate electrolyte chemistry
Correct answer: B
Instant-off measurements remove the IR drop caused by current flowing
through soil or electrolyte, providing a more accurate estimate of the true
polarized structure potential.
8. Which component of an impressed current cathodic protection system
converts AC power into DC power?
, A. Junction box
B. Rectifier
C. Reference cell
D. Test station
Correct answer: B
A rectifier converts alternating current into direct current and controls the
amount of protective current supplied to the cathodic protection system.
9. What is the primary function of a cathodic protection test station?
A. To store protective current
B. To provide access points for electrical measurements
C. To increase soil conductivity
D. To replace anodes
Correct answer: B
Test stations allow technicians to measure structure potentials, current
flow, and continuity without excavating the protected structure.
10. Which material is commonly used as a sacrificial anode for
protecting steel structures?
A. Copper
B. Aluminum or magnesium
C. Stainless steel
D. Platinum only
Correct answer: B
Magnesium and aluminum alloys are commonly used as sacrificial anodes
because they are more electrically active than steel and provide protective
current.
Examiner Certification Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1.A cathodic protection system is primarily designed to protect metallic
structures from corrosion by which mechanism?
A. Increasing the acidity of the surrounding electrolyte
B. Making the protected metal the cathode of an electrochemical cell
C. Removing all moisture from the environment
D. Coating the metal with a conductive material
Correct answer: B
Cathodic protection works by forcing the protected structure to become
the cathode in an electrochemical reaction, preventing it from losing
electrons and undergoing oxidation (corrosion).
2. Which type of corrosion control method uses an external DC power
source and impressed current anodes?
A. Galvanic cathodic protection
B. Passive corrosion protection
C. Impressed current cathodic protection
D. Chemical inhibition
Correct answer: C
,Impressed current cathodic protection systems use an external power
supply to drive current from anodes to the structure, providing controlled
corrosion protection.
3. In a cathodic protection system, corrosion occurs primarily at which
location of an electrochemical cell?
A. Cathode
B. Anode
C. Electrolyte
D. Reference electrode
Correct answer: B
The anode is the area where metal oxidation occurs because it releases
electrons into the electrochemical circuit, resulting in corrosion.
4. Which instrument is commonly used by a cathodic protection tester to
measure structure-to-electrolyte potentials?
A. Clamp meter
B. Pipe locator
C. Digital voltmeter
D. Insulation tester
Correct answer: C
A high-impedance digital voltmeter is used to measure cathodic protection
potentials accurately without significantly affecting the circuit.
5. What is the purpose of a copper/copper sulfate reference electrode in
cathodic protection testing?
A. To supply protective current
B. To measure soil resistivity
C. To provide a stable reference potential for measurements
D. To increase anode efficiency
,Correct answer: C
A copper/copper sulfate reference electrode provides a known and stable
electrical potential against which structure potentials can be measured.
6. The commonly accepted minimum protection criterion for steel
structures using a copper/copper sulfate reference electrode is
approximately:
A. +500 mV
B. -850 mV
C. -100 mV
D. +50 mV
Correct answer: B
A potential of approximately -850 mV or more negative relative to a
copper/copper sulfate electrode is commonly used as a cathodic protection
criterion for steel.
7. What is the main purpose of measuring “instant-off” potentials during
cathodic protection testing?
A. To measure coating thickness
B. To eliminate voltage drop errors caused by current flow
C. To determine pipe diameter
D. To calculate electrolyte chemistry
Correct answer: B
Instant-off measurements remove the IR drop caused by current flowing
through soil or electrolyte, providing a more accurate estimate of the true
polarized structure potential.
8. Which component of an impressed current cathodic protection system
converts AC power into DC power?
, A. Junction box
B. Rectifier
C. Reference cell
D. Test station
Correct answer: B
A rectifier converts alternating current into direct current and controls the
amount of protective current supplied to the cathodic protection system.
9. What is the primary function of a cathodic protection test station?
A. To store protective current
B. To provide access points for electrical measurements
C. To increase soil conductivity
D. To replace anodes
Correct answer: B
Test stations allow technicians to measure structure potentials, current
flow, and continuity without excavating the protected structure.
10. Which material is commonly used as a sacrificial anode for
protecting steel structures?
A. Copper
B. Aluminum or magnesium
C. Stainless steel
D. Platinum only
Correct answer: B
Magnesium and aluminum alloys are commonly used as sacrificial anodes
because they are more electrically active than steel and provide protective
current.
