Page 1 of 111
AMPP/NACE Cathodic Protection Tester (CP1)
Exam COMPLETE QUESTIONS AND DETAILED
SOLUTIONS LATEST UPDATE THIS YEAR-JUST
RELEASED
SUMMARIZED EXAM COVERAGE (SHORT VERSION)
The CP1 exam covers corrosion fundamentals, cathodic protection theory (galvanic and impressed
current systems), CP components, pipe-to-soil potential testing, soil resistivity testing (Wenner
method), CP equipment and instrumentation, field testing procedures, safety practices, CP data
interpretation, system troubleshooting, stray current effects, and compliance with AMPP CP criteria
standards.
AMPP/NACE CP1 Exam
1.
A corrosion technician measures pipe-to-soil potential and obtains unstable fluctuating readings. What
is the most likely cause?
A. Perfect CP system performance
B. Poor reference electrode contact or electrical noise interference
C. Excess coating quality
D. Overprotected pipeline condition
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Answer: B
Rationale: Unstable readings usually indicate poor contact or electrical interference.
2.
A technician places a copper/copper sulfate reference electrode on dry soil and gets inconsistent
readings. What should be done?
A. Increase voltage range
B. Improve soil contact using wet sponge or water conditioning
C. Replace pipeline coating
D. Increase rectifier output
Answer: B
Rationale: Proper electrode contact requires moist soil for accurate measurement.
3.
A cathodic protection system shows reduced current output from rectifier. What is the most likely issue?
A. Improved anode performance
B. Faulty rectifier, wiring damage, or anode depletion
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C. Increased soil resistivity always
D. Better coating condition
Answer: B
Rationale: Reduced output often indicates system or component failure.
4.
A pipeline section shows less negative potential than surrounding areas. What is likely condition?
A. Overprotection
B. Underprotection or coating damage increasing corrosion risk
C. Perfect CP balance
D. No corrosion activity
Answer: B
Rationale: Less negative potential indicates insufficient cathodic protection.
5.
A technician performs soil resistivity test using Wenner 4-pin method but places probes unevenly
spaced. What is error?
, Page 4 of 111
A. Improved accuracy
B. Incorrect resistivity reading due to improper spacing
C. Better conductivity
D. Reduced corrosion risk
Answer: B
Rationale: Equal spacing is essential for valid Wenner method results.
6.
A CP technician observes sudden increase in current output without system adjustment. What is likely
cause?
A. Improved coating condition
B. Coating failure or short circuit increasing current demand
C. Reduced corrosion
D. Stable system performance
Answer: B
Rationale: Increased current demand often indicates coating damage.
AMPP/NACE Cathodic Protection Tester (CP1)
Exam COMPLETE QUESTIONS AND DETAILED
SOLUTIONS LATEST UPDATE THIS YEAR-JUST
RELEASED
SUMMARIZED EXAM COVERAGE (SHORT VERSION)
The CP1 exam covers corrosion fundamentals, cathodic protection theory (galvanic and impressed
current systems), CP components, pipe-to-soil potential testing, soil resistivity testing (Wenner
method), CP equipment and instrumentation, field testing procedures, safety practices, CP data
interpretation, system troubleshooting, stray current effects, and compliance with AMPP CP criteria
standards.
AMPP/NACE CP1 Exam
1.
A corrosion technician measures pipe-to-soil potential and obtains unstable fluctuating readings. What
is the most likely cause?
A. Perfect CP system performance
B. Poor reference electrode contact or electrical noise interference
C. Excess coating quality
D. Overprotected pipeline condition
, Page 2 of 111
Answer: B
Rationale: Unstable readings usually indicate poor contact or electrical interference.
2.
A technician places a copper/copper sulfate reference electrode on dry soil and gets inconsistent
readings. What should be done?
A. Increase voltage range
B. Improve soil contact using wet sponge or water conditioning
C. Replace pipeline coating
D. Increase rectifier output
Answer: B
Rationale: Proper electrode contact requires moist soil for accurate measurement.
3.
A cathodic protection system shows reduced current output from rectifier. What is the most likely issue?
A. Improved anode performance
B. Faulty rectifier, wiring damage, or anode depletion
, Page 3 of 111
C. Increased soil resistivity always
D. Better coating condition
Answer: B
Rationale: Reduced output often indicates system or component failure.
4.
A pipeline section shows less negative potential than surrounding areas. What is likely condition?
A. Overprotection
B. Underprotection or coating damage increasing corrosion risk
C. Perfect CP balance
D. No corrosion activity
Answer: B
Rationale: Less negative potential indicates insufficient cathodic protection.
5.
A technician performs soil resistivity test using Wenner 4-pin method but places probes unevenly
spaced. What is error?
, Page 4 of 111
A. Improved accuracy
B. Incorrect resistivity reading due to improper spacing
C. Better conductivity
D. Reduced corrosion risk
Answer: B
Rationale: Equal spacing is essential for valid Wenner method results.
6.
A CP technician observes sudden increase in current output without system adjustment. What is likely
cause?
A. Improved coating condition
B. Coating failure or short circuit increasing current demand
C. Reduced corrosion
D. Stable system performance
Answer: B
Rationale: Increased current demand often indicates coating damage.
