Take Free AMPP NACE CP4 Exam Practice Test- Quiz Course

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Here, you can take a free AMPP NACE CP4 Exam Practice Test Quiz Course with the latest Cathodic Protection Specialist questions and answers.

1.

Domain 1 – Basics:
What is the primary function of a cathodic protection system?

 
 
 
 

2.

Which of the following is NOT a primary element of a cathodic protection system?

 
 
 
 

3.

In cathodic protection, current flows from:

 
 
 
 

4.

What is the typical potential criterion for steel structures in soil according to NACE SP0169?

 
 
 
 

5.

What is polarization in cathodic protection?

 
 
 
 

6.

Domain 2. Insulators and Shorts
What is the primary purpose of an electrical insulator in a CP system?

 
 
 
 

7.

Which of the following is not a function of an insulator in a CP system?

 
 
 
 

8.

A short in a cathodic protection system typically refers to:

 
 
 
 

9.

What is the effect of a short on a CP system?

 
 
 
 

10.

How can you test the effectiveness of an insulator?

 
 
 
 

11.

Domain 3. Periodic Surveys
What is the primary objective of a periodic cathodic protection (CP) survey?

 
 
 
 

12.

According to best practices, how often should a periodic pipe-to-soil survey be conducted?

 
 
 
 

13.

What is typically recorded during a close-interval potential survey (CIPS)?

 
 
 
 

14.

Which reference electrode is commonly used in periodic surveys?

 
 
 
 

15.

A valid pipe-to-soil potential measurement must be taken:

 
 
 
 

16.

Domain 4. Reference Cells
What is the main function of a reference electrode in cathodic protection?

 
 
 
 

17.

Which reference electrode is most commonly used for underground steel pipelines?

 
 
 
 

18.

What is the correct potential of a Cu/CuSO₄ reference electrode relative to a standard hydrogen electrode (SHE)?

 
 
 
 

19.

What is a key maintenance practice for Cu/CuSO₄ reference electrodes?

 
 
 
 

20.

What can cause erroneous readings with a Cu/CuSO₄ electrode?

 
 
 
 

21.

Domain 5. Field Tests
What is the primary purpose of conducting field tests in cathodic protection?

 
 
 
 

22.

Which instrument is commonly used for measuring pipe-to-soil potentials?

 
 
 
 

23.

A valid pipe-to-soil potential survey should include measurements taken with respect to:

 
 
 
 

24.

What is the ideal potential value (IR-free) to meet NACE SP0169 criterion for steel in contact with soil?

 
 
 
 

25.

A sharp drop in potential at one test station during a close-interval survey may indicate:

 
 
 
 

26.

Domain 6. DC Stray Current Interference
What is a DC stray current?

 
 
 
 

27.

DC stray currents most commonly originate from:

 
 
 
 

28.

The main risk of DC stray currents to buried pipelines is:

 
 
 
 

29.

A common industrial source of DC stray current is:

 
 
 
 

30.

A pipeline exposed to DC stray current will typically show corrosion where:

 
 
 
 

31.

Domain 7. AC Mitigation
What is the primary risk of AC interference on buried pipelines?

 
 
 
 

32.

Which condition increases the risk of AC corrosion on a pipeline?

 
 
 
 

33.

Which of the following is a common source of AC interference?

 
 
 
 

34.

What is the primary function of a zinc ribbon in AC mitigation?

 
 
 
 

35.

Which of the following is NOT a method of AC mitigation?

 
 
 
 

36.

Domain 8. Internal
What is the primary cause of internal corrosion in pipelines?

 
 
 
 

37.

Which gas is most commonly associated with internal corrosion in oil pipelines?

 
 
 
 

38.

Which of the following environments is most likely to cause microbiologically influenced corrosion (MIC)?

 
 
 
 

39.

A pipeline with high internal corrosion typically shows:

 
 
 
 

40.

What is the role of corrosion inhibitors in internal corrosion control?

 
 
 
 

41.

Domain 9. Corrosion Theory
What is the primary cause of corrosion in metallic structures?

 
 
 
 

42.

In a corrosion cell, which site experiences metal loss?

 
 
 
 

43.

What is the main function of a cathodic protection system?

 
 
 
 

44.

Which of the following best describes uniform corrosion?

 
 
 
 

45.

Which of the following is an example of localized corrosion?

 
 
 
 

46.

Domain 10. Polarization
What is polarization in cathodic protection terms?

 
 
 
 

47.

Which of the following best describes the polarization of a protected structure?

 
 
 
 

48.

The term “depolarization” in CP systems refers to:

 
 
 
 

49.

Which of the following methods is used to measure the polarized potential of a structure?

 
 
 
 

50.

Which factor does NOT influence polarization behavior?

 
 
 
 

51.

Domain 11. Cathodic Protection
What is the primary objective of Cathodic Protection (CP)?

 
 
 
 

52.

Which two main methods of CP are commonly used?

 
 
 
 

53.

In an impressed current CP system, the role of the DC power source is to:

 
 
 
 

54.

Which anode material is typically used in sacrificial CP systems?

 
 
 
 

55.

What is polarization in CP systems indicative of?

 
 
 
 

56.

Domain 12. Codes and Compliance
Which of the following organizations publishes standards specifically related to cathodic protection systems?

 
 
 
 

57.

Which AMPP standard provides guidelines for CP on buried or submerged metallic piping systems?

 
 
 
 

58.

The purpose of compliance with CP codes and standards is to:

 
 
 
 

59.

Which U.S. federal regulation governs CP systems for underground storage tanks (USTs)?

 
 
 
 

60.

Which API standard addresses CP for aboveground storage tanks?

 
 
 
 

61.

Domain 13. Design
What is the primary objective when designing a cathodic protection system?

 
 
 
 

62.

What is the minimum protection criterion for steel in soil according to NACE SP0169?

 
 
 
 

63.

In CP system design, which of the following is not typically considered when estimating current requirements?

 
 
 
 

64.

What is the most commonly used method to calculate the required number of sacrificial anodes?

 
 
 
 

65.

Which configuration provides the deepest groundbed for impressed current systems?

 
 
 
 

Question 1 of 65

Take Free AMPP NACE CP4 Exam Practice Test- Quiz Course
Take Free AMPP NACE CP4 Exam Practice Test- Quiz Course

Are you looking for a Free AMPP NACE CP4 Practice Test with the latest Cathodic Protection Specialist Level 4 questions and answers?

If yes, then you’re in the right place! On our website, you can take a free, online AMPP NACE CP4 Exam Practice Test quiz designed to improve your score in the NACE CP4 Exam. Our quiz course helps you prepare for the NACE-CP4-001 CBT Exam using a structured, easy-to-follow format.

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  • Covers all major topics from the official CP4 syllabus
  • Includes expert-curated questions with detailed explanations
  • Designed specifically for the Computer-Based Testing (CBT) format
  • Accessible online anytime – no registration needed
  • Evaluate your results immediately after the test

Our mission is to help you pass the AMPP CP4 exam on your first attempt.

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How to Save the Quiz as a PDF?

After finishing the quiz:

  1. Review the question and answer list.
  2. Copy and paste it into a Word document.
  3. Save or export it as a PDF file.

Topics Covered in Our CP4 Practice Quiz:

  1. Basics of CP Systems
  2. Insulators and Shorts
  3. Periodic Surveys
  4. Reference Electrodes
  5. Field Testing Techniques
  6. DC Stray Current Interference
  7. AC Interference and Mitigation
  8. Internal Corrosion Monitoring
  9. Corrosion Theory
  10. Polarization Concepts
  11. Cathodic Protection Methods
  12. Applicable Codes & Standards
  13. Design Principles

CP4 Exam Eligibility Requirements (As per AMPP Guidelines)

To appear for the CP4 Exam (Cathodic Protection Specialist), you must:

Have one of the following:

  • 12+ years of verifiable CP experience
  • OR 6 years of CP experience with a 4-year engineering/science degree
  • OR a P.E. license or equivalent qualification

Pass Two Core Exams:

  1. CP4 Theory Exam
  2. CP4 Case-Based Exam

Submit a Valid Application for CP4 Certification

Note: There is no direct progression from CP3 to CP4. Substantial design experience and formal education in math/science/engineering are essential.

Here’s the latest pattern for the AMPP (formerly NACE) CP‑4 Cathodic Protection Specialist Level 4 exams:

Exam Pathways & Formats

1. New (Non-legacy) Candidates — Effective early 2025 onward 

  • Single Combined Exam: “CP4”
    • 75 MCQs total: 60 scored + 15 unscored
    • Duration: 6 hours (includes 4 min NDA + 6 min tutorial)
    • Format: Computer-based testing (CBT) at Pearson VUE centers
    • Covers both Theory and Applied knowledge in one sitting
    • Six attempts are allowed within a four-year certification window

2. Legacy Candidates — Before early 2025 registration

  • Two Separate Exams:
    • Theory Exam
      • 60 scored MCQs + 5 unscored
      • 4 hours, including NDA and tutorial
    • Case-Based (Applied) Exam
      • 25 scored MCQs + 5 unscored
      • 4 hours
    • Both exams must be passed separately
    • Each exam: 6 attempts within a 4-year window
    • Once a legacy candidate opts for the new single format, they cannot revert to taking separate exams

Detailed Breakdown

Candidate Type Exam Format Questions (Scored / Unscored) Duration
New (post-2025) Combined Theory + Applied (single) 60 / 15 = 75 total 6 hours
Legacy (pre-2025) Theory only 60 / 5 = 65 total 4 hours
Case-Based (Applied scenario) 25 / 5 = 30 total ~4 hours
  • Exams are closed-book, CBT format. Calculators and reference PDFs (formulas, charts) are provided
  • Pass/fail results are given separately per exam or combined exam.

Attempt Limits & Certification Window

  • New format: candidates get 6 attempts in 4 years.
  • Legacy format: the same limits apply separately to each exam.
  • Until January 2027, up to 8 total attempts are permitted

Prerequisites & Delivery

  • Exam delivery: Pearson VUE globally, available in English; standard offerings include February and August test windows (AMPP).
  • Prerequisites:
    • CP3 certification beginning January 2027 for new candidates
    • Ethics training course
    • Required work experience/education (e.g., ≥ 6–12 years CP, engineering/scientific degree) (Higher Logic Download, AMPP)

Quick Summary

  • New candidates (from 2025) take a single 6‑hour exam with 75 MCQs covering both theory and applied topics.
  • Legacy candidates can still take separate Theory and Case-Based exams until they switch to the new format.
  • Both formats are computer‑based with retake limits and a 4‑year window.

Recommended Study Materials

AMPP Preparation Guides:

  • CP Specialist (EPG)
  • CP Technologist (EPG)
  • CP Technician (EPG)
  • CP Tester (EPG)

Books & References:

  1. Peabody’s Control of Pipeline Corrosion – A.W. Peabody
  2. Corrosion Tests & Standards – ASTM
  3. Handbook of Cathodic Corrosion Protection – Von Baeckmann et al.
  4. Atlas of Electrochemical Equilibria – M. Pourbaix
  5. Corrosion Engineers Reference Handbook – R. Baboian
  6. Pipeline Corrosion & CP – M.E. Parker
  7. Deep Anode Systems – T.H. Lewis

Key Standards:

  • NACE SP 0169, SP 0200, SP 0575
  • NACE TM 0102, SP 0177, SP 0207
  • ASTM SI 10
  • PRCI & research-based field survey reports

Additional Free Quiz Courses on Our Site:

  1. CP1 Practice Test (Tester)
  2. CP2 Practice Test (Technician)
  3. CP3 Practice Test (Technologist)

Have Questions?

Ask in the comments section or contact us directly via email or WhatsApp.

Don’t miss this opportunity to test your knowledge and boost your exam confidence—for free!

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