100+ Free AMPP CP2 Technician Practice Questions

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A CP technician observes that a rectifier has been providing stable DC output for months, but in the past week the DC output current has risen by 30% with no voltage change. Which cause is MOST likely?

Anode bed degradation

Improved coating

New coating holiday or increased CP demand on the structure

Rectifier diode failure

to track

2026 Statistics

Key Facts: AMPP CP2 Technician Exam

110

Exam Questions (89 scored + 21 unscored)

AMPP CP2 Exam Preparation Guide (Nov 2025)

3 hours

Exam Time (effective Dec 16, 2025)

AMPP CP2 EPG

$275

CBT Exam Fee (exam-only / retake)

AMPP 2024 Exam Fees

CP1

Prerequisite

AMPP CP2 EPG

1-3 years

CP Work Experience (by education)

AMPP CP2 eligibility

3 years

Certification Validity

AMPP renewal policy

The AMPP CP2 Cathodic Protection Technician exam (effective Dec 16, 2025) contains 110 multiple-choice questions (89 scored + 21 unscored), a 3-hour time limit, and costs $275 via CBT at Pearson VUE. It is the intermediate CP credential from AMPP, requiring CP1 (or equivalent) plus 1-3 years of CP work experience (depending on education). The CP2 body of knowledge covers corrosion theory (electrochemistry, Evans diagrams, polarization, Tafel), equipment and equipment management, field measurements (CIPS, DCVG, coupon use, cased crossings, interference), ICCP power sources and rectifier diagnostics, and field data interpretation and documentation. Certification is valid for 3 years and is the stepping stone to the CP3 Technologist credential.

Sample AMPP CP2 Technician Practice Questions

Try these sample questions to test your AMPP CP2 Technician exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1A CP technician observes that a rectifier has been providing stable DC output for months, but in the past week the DC output current has risen by 30% with no voltage change. Which cause is MOST likely?

A.Anode bed degradation

B.Improved coating

C.New coating holiday or increased CP demand on the structure

D.Rectifier diode failure

Explanation: With DC voltage constant and current rising, circuit resistance has decreased. The most common cause in operating CP systems is a new coating defect or damage exposing more bare steel to electrolyte, increasing CP demand. Anode bed degradation would increase (not decrease) resistance, and a failed diode would typically reduce output.

2Which technique does a CP Technician use to locate small coating defects along a pipeline without excavation?

A.Close Interval Potential Survey (CIPS)

B.Direct Current Voltage Gradient (DCVG) survey

C.Over-the-line structure potential at 1 km intervals

D.Pipe-to-electrolyte oscilloscope trace

Explanation: DCVG surveys are the primary above-ground technique for locating and sizing pipeline coating defects. With the rectifier interrupted at a known cycle, the surveyor walks above the pipeline with two closely spaced reference electrodes (typically ~1.5 m apart), recording voltage swings from the CP current discharging at defects. The %IR measurement classifies defect severity.

3During an instant-off survey on a pipeline with two rectifiers, both interrupters are synchronized and run for one full cycle. The 'on' potential at test station TS-15 is -1.080 V CSE and 'off' is -0.840 V CSE. What should the technician report?

A.The 100 mV polarization shift criterion is met

B.The polarized potential does NOT meet the -850 mV polarized criterion; additional CP current or investigation is required

C.The structure is overprotected

D.The interrupter is faulty

Explanation: The instant-off (polarized) potential of -0.840 V is less negative than -0.850 V, so the -850 mV polarized criterion is NOT met at TS-15. A CP2 Technician flags this and investigates (more current output, possible coating defect, stray current interference, or interference from a foreign structure). The IR drop (1.080 - 0.840 = 240 mV) is relatively large, suggesting current is flowing but not enough to polarize the structure at this location.

4Which of the following is MOST likely to cause static DC stray current interference on a buried pipeline?

A.Adjacent DC transit system

B.Another pipeline's operating CP rectifier nearby

C.Adjacent HVAC transmission line

D.Natural telluric currents

Explanation: Static (time-invariant) DC stray current most often comes from a nearby operating CP rectifier on another pipeline or structure, whose anode bed injects current into common earth that picks up on the other pipeline and discharges elsewhere. DC transit systems cause DYNAMIC (fluctuating) stray current because train loads change. HVAC causes AC interference, and telluric currents are transient.

5A pipeline crossing a high-voltage AC transmission corridor shows 45 V AC induced voltage at a test station. Per NACE SP0177 personnel safety guidance, what action should the CP Technician take?

A.Continue normal work with insulated gloves

B.Stop work, mitigate induced AC to below the 15 V AC personnel safety threshold (or apply approved protection practices), and notify supervision

C.Ignore it because CP is unaffected

D.Disconnect the bond

Explanation: NACE SP0177 (now SP21424) identifies 15 V AC as a conservative threshold for personnel safety, above which touch voltage hazards may exist at test stations, valve risers, and equipment. 45 V AC is a significant hazard. The technician must stop work, notify supervision, and ensure AC mitigation (gradient control mats, polarization cells, solid-state decouplers, distributed sacrificial anode ground mats) before resuming.

6A CP Technician measures a rectifier output of 14.0 V DC and 8.0 A DC. What is the approximate DC output power?

A.22 W

B.1.75 W

C.112 W

D.80 W

Explanation: P = V × I = 14.0 V × 8.0 A = 112 W DC output power. This is one-half of the rectifier efficiency calculation; the AC input power is measured at the kWh meter or via AC clamp-on meter on the primary side to yield efficiency = P_DC/P_AC.

7Which reference electrode conversion is correct?

A.Reading vs Ag/AgCl (sat KCl) ≈ Reading vs CSE + 119 mV (i.e., CSE reading is more negative)

B.Reading vs CSE ≈ Reading vs SHE + 318 mV

C.Reading vs Zn reference ≈ 0

D.Reading vs Ag/AgCl is always 250 mV more negative than CSE

Explanation: CSE (+0.318 V vs SHE) is ~119 mV more positive than saturated Ag/AgCl (+0.199 V vs SHE). A structure reading of -0.780 V vs Ag/AgCl converts to approximately -0.899 V vs CSE (shift 119 mV more negative). Conversions are essential when combining data from marine and soil references.

8Why does a CP Technician use a 4-wire linear line-current test station instead of a 2-wire shunt at remote pipeline locations?

A.Lower cost

B.The 4-wire (Kelvin) configuration eliminates lead resistance error when reading very small mV drops along a known pipe span, giving accurate line-current measurement

C.4 wires supply more current

D.Redundancy only

Explanation: A linear (4-wire, Kelvin) test station connects two current leads and two separate voltage leads to precisely calibrated points on the pipeline. The voltmeter reads the mV drop across the known span without including lead resistance, giving accurate current calculation from the pipe's longitudinal resistance. This is standard for measuring current flow in the pipe along a right-of-way.

9Which impressed-current anode type is DIMENSIONALLY STABLE (consumes very little material during service)?

A.High-silicon cast iron (HSCI)

B.Graphite

C.Mixed-metal oxide (MMO) on titanium

D.Aluminum-zinc-indium

Explanation: MMO (mixed-metal-oxide) coated titanium anodes have extremely low consumption rates (typically <1 mg/A·yr) and are considered dimensionally stable. HSCI and graphite consume at rates around 0.2-0.5 kg/A·yr and 0.1-1.0 kg/A·yr respectively. Al-Zn-In is a GALVANIC anode, not impressed current.

10What is the PRIMARY reason to install a polarization cell replacement (PCR) or solid-state decoupler on a bonded-to-ground CP system?

A.Pass lightning and AC fault current to ground while blocking steady-state DC CP current

B.Increase anode current

C.Replace a rectifier

D.Measure pipe temperature

Explanation: Solid-state decouplers and polarization cell replacements provide a high DC impedance (blocking CP current from draining to ground) while presenting a low AC impedance (allowing AC fault and lightning surge current to pass safely to ground). They are used where a pipeline must be grounded for safety but CP current must be preserved. NACE SP0177 / SP21424 provides AC mitigation design guidance.

About the AMPP CP2 Technician Exam

The AMPP CP2 Cathodic Protection Technician certification is the intermediate credential in AMPP's Cathodic Protection program. It validates the ability to test and maintain operating CP systems, troubleshoot rectifiers and anode beds, identify interference conditions, perform over-the-line surveys (CIPS, DCVG, ACVG), and supervise CP system installation. Certification requires CP1 (or equivalent), 1-3 years of CP work experience (depending on education), the CP2 Practical Exam (in course), the CP2 Theory Exam at Pearson VUE, Ethics for the Corrosion Professional, and an approved application.

Assessment

110 multiple-choice questions (89 scored + 21 unscored pretest items); closed-book with a limited reference PDF (effective Dec 16, 2025)

Time Limit

3 hours (includes 4 min NDA + 6 min tutorial)

Passing Score

Pass/fail criterion-referenced cut score set by AMPP SMEs

Exam Fee

$275 (CBT exam-only / retake); exam fee is included in the CP2 Course fee for candidates attending the course (AMPP (Association for Materials Protection and Performance))

AMPP CP2 Technician Exam Content Outline

30-35%

Field Measurements of CP Systems

CIPS, DCVG, ACVG, ACCA, coupon use, cased crossing/shorted casing tests, soil resistivity (Wenner 4-pin, Barnes layer), interference detection, and instant-off technique

25-30%

Corrosion Theory

Electrochemical cells, Evans diagrams, Tafel slope and E log I analysis, Nernst equation, polarization curves, Faraday's law, stray current, and shielding

15-20%

ICCP Power Sources

Rectifier operating modes (constant voltage/current/potential), diode diagnostics, efficiency calculation, rectifier troubleshooting, solar/remote supplies, and surge protection

10-15%

Equipment and Equipment Management

High-impedance voltmeters, true-RMS AC meters, clamp-on ammeters, shunts, reference electrode types and calibration, GPS-synchronized interrupters

10-15%

Field Data Interpretation and Documentation

Applying NACE SP0169 -850 mV polarized and 100 mV shift criteria, compiling field reports, alignment sheets, troubleshooting workflows, and regulatory reporting

How to Pass the AMPP CP2 Technician Exam

What You Need to Know

Passing score: Pass/fail criterion-referenced cut score set by AMPP SMEs
Assessment: 110 multiple-choice questions (89 scored + 21 unscored pretest items); closed-book with a limited reference PDF (effective Dec 16, 2025)
Time limit: 3 hours (includes 4 min NDA + 6 min tutorial)
Exam fee: $275 (CBT exam-only / retake); exam fee is included in the CP2 Course fee for candidates attending the course

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

AMPP CP2 Technician Study Tips from Top Performers

1Master diagnostic patterns at rectifiers: high V / zero I = open circuit; low V / high I = short; declining V but rising I = decreased circuit resistance (new coating defect)

2Practice converting readings between CSE, Ag/AgCl (sat KCl), Ag/AgCl (seawater), and Zn references; memorize the ~119 mV offset between CSE and sat KCl Ag/AgCl

3Know how to size galvanic anodes using Faraday's law and anode capacity (~1230 A·h/kg for Mg, ~780 A·h/kg for Zn)

4Understand NACE SP0169 criterion application: the -300 mV shift criterion was REMOVED in 2002; only -850 mV polarized and 100 mV shift remain

5Study NACE SP0177 / SP21424 AC mitigation: 15 V AC personnel safety threshold, touch voltage, solid-state decouplers, gradient control wire, and AC corrosion above ~30 A/m² current density

6Practice interpreting CIPS + DCVG paired data to identify coating defect locations, sizes, and priority classifications (severe, moderate, minor)

7Know PHMSA 49 CFR 192/195 monitoring requirements: rectifier inspections at least 6 times per year at intervals ≤2.5 months, annual test station surveys

8Study cased crossing diagnostics (shorted casing identification and mitigation) and isolation flange verification techniques

Frequently Asked Questions

What is the AMPP CP2 Cathodic Protection Technician certification?

AMPP CP2 Technician is the intermediate credential in the AMPP Cathodic Protection program (formerly NACE CP2). Technicians test and maintain operating CP systems, troubleshoot rectifiers and anode beds, identify and evaluate interference conditions, perform over-the-line surveys such as CIPS and DCVG, and supervise or assist with installation of CP systems. It builds on the CP1 Tester foundation and is the prerequisite stepping stone to the CP3 Technologist.

How many questions are on the CP2 Theory exam and how long is it?

Effective December 16, 2025, the CP2 Theory Exam (NACE-CP2-001) contains 110 multiple-choice questions — 89 scored plus 21 unscored pretest items — with a 3-hour time limit (including 4 minutes for the non-disclosure agreement and 6 minutes for the system tutorial). It is delivered as a closed-book computer-based test at Pearson VUE test centers, with a limited reference PDF available in the test interface for specific equations and conversion tables.

What does CP2 cost?

The CP2 Theory Exam is $275 (CBT) as an exam-only or retake per the June 2024 AMPP fee schedule. For candidates attending the CP2 Course, the exam fee is included in the course fee. A practical (hands-on) CP2 Exam is delivered at the end of the CP2 course.

What are the prerequisites for CP2?

CP2 requires successful completion of CP1 Cathodic Protection Tester OR equivalent training. Work experience: 3 years of verifiable CP experience, OR 2 years plus 2 years post-high-school math/science or technical/trade training, OR 1 year plus a 4-year physical science or engineering degree. The Ethics for the Corrosion Professional course and an approved application are also required.

How does CP2 differ from CP1 and CP3?

CP1 Tester observes, records, and measures CP effectiveness (entry-level). CP2 Technician tests, troubleshoots, identifies interference, and supervises installation (intermediate field role). CP3 Technologist performs advanced data interpretation and simple CP system design, including rectifier sizing, anode bed design, and attenuation calculations. CP4 Specialist is the highest level — advanced design for offshore, reinforced concrete, and complex interference environments.

How long is CP2 certification valid?

CP2 certification is valid for 3 years. Renewal requires an approved recertification application, at least 1.5 years of CP work experience in the most recent 3-year period, the required Professional Development Hours (PDHs), and a non-refundable processing fee. Candidates track their experience and PDHs through the AMPP My Certification Portal.

What topics should I study hardest for CP2?

Focus on field measurement techniques (instant-off, CIPS, DCVG, ACVG, ACCA, coupons), interference detection and mitigation (DC stray current from transit systems, AC induction from HVAC lines), rectifier diagnostics (open vs short circuit, diode failure, constant-voltage vs constant-current modes), NACE SP0169 criterion application, and reference electrode conversions. Expect questions on NACE SP0177/SP21424 AC mitigation and NACE SP0286 isolation practices.