Free AMPP Certified Corrosion Technologist Practice Questions

Sample Practice Questions

Try these 10 sample questions from the AMPP Certified Corrosion Technologist practice bank. Each includes the answer and explanation. Continue with the interactive practice above to review the full question set.

1. 1What supplies the driving potential in an impressed-current cathodic protection system?

   1. A. The natural potential difference between two coupled metals
   2. B. An external source of direct-current electrical power
   3. C. The electrolyte concentration difference along the structure
   4. D. The natural potential difference between coated and bare areas

   Answer: B

   Explanation: The UFC states, "an external power source, usually a transformer-rectifier, provides the driving force." This distinguishes impressed-current protection from protection driven by the natural potential difference of galvanic anodes.

   Reference: UFC 3-570-01: Cathodic Protection — Appendix B, B-4.2, p. 65

2. 2Steel scheduled for abrasive blast cleaning has greasy deposits. Which preparation action addresses the adhesion risk from those deposits?

   1. A. Increase blast pressure and omit a separate degreasing step
   2. B. Remove the grease with suitable cleaning before abrasive preparation
   3. C. Add extra thinner to the primer to dissolve the grease during coating
   4. D. Apply a thicker primer to encapsulate the remaining grease

   Answer: B

   Explanation: The guide warns that "contaminants left on the surface can be impacted into the substrate surface during preparation using other methods". Removing grease before abrasive preparation addresses that contamination; higher blast pressure, extra primer thinner, or encapsulation does not establish a clean bonding surface.

   Reference: Guide to Protective Coatings, Inspection, and Maintenance — Chapter VI, SSPC-SP1: Solvent Cleaning, p. 34

3. 3At which location in an aqueous corrosion cell does metal oxidation primarily occur?

   1. A. The anodic site
   2. B. The cathodic site
   3. C. The bulk electrolyte only
   4. D. The external wire only

   Answer: A

   Explanation: FIST states, "The anodic locations where mainly oxidation takes place are called anodes". Cathodic sites primarily support reduction; the electrolyte and metallic path transport charge between reaction sites.

   Reference: FIST 4-5: Corrosion and Cathodic Protection — 3.3.1, p. 9

4. 4Which material property describes the ability to undergo plastic deformation in tension without rupturing?

   1. A. Hardness
   2. B. Elasticity
   3. C. Ductility
   4. D. Density

   Answer: C

   Explanation: DOE defines ductility as "the ability of a material to withstand plastic deformation without rupture." Hardness resists indentation, elasticity concerns recoverable deformation, and density concerns mass per volume.

   Reference: DOE Fundamentals Handbook: Material Science, Volume 1 — Module 2, Physical Properties—Ductility, p. 25

5. 5To make laboratory inhibitor tests representative of an intended oilfield flowline application, which basis should be established before selecting the test conditions?

   1. A. Conditions from a standard ambient-water test regardless of field fluids
   2. B. The field operating conditions that control inhibitor performance
   3. C. Conditions from the supplier's most favorable test regardless of service
   4. D. Conditions from a prior application with a different process environment

   Answer: B

   Explanation: ASTM G170 identifies an important first step: "identify the field conditions". Laboratory evaluation should represent the relevant material, fluid, temperature, pressure, and flow conditions; a product name alone does not determine performance.

   Reference: ASTM G170: Evaluating and Qualifying Oilfield and Refinery Corrosion Inhibitors in the Laboratory — Significance and Use, 5.4–5.6

6. 6What is the minimum oxygen concentration by volume that avoids classification as oxygen deficient under OSHA's general-industry confined-space definitions?

   1. A. 23.5 percent
   2. B. 20.9 percent
   3. C. 19.5 percent
   4. D. 18.0 percent

   Answer: C

   Explanation: OSHA defines an oxygen-deficient atmosphere as "an atmosphere containing less than 19.5 percent oxygen by volume." The boundary is 19.5 percent. Higher concentrations also avoid deficiency, but the question asks for the minimum; this does not establish that all other entry conditions are acceptable.

   Reference: OSHA: 29 CFR 1910.146—Permit-Required Confined Spaces — 1910.146(b), Oxygen deficient atmosphere

7. 7A CP design has 200 ft² of exposed steel requiring a design current density of 20 mA/ft². Ignoring additional allowances, what total protective current is required?

   1. A. 0.10 A
   2. B. 0.40 A
   3. C. 4.0 A
   4. D. 40 A

   Answer: C

   Explanation: The UFC gives "I = A × CD". Multiplying 200 ft² by 20 mA/ft² gives 4,000 mA, or 4.0 A. The conversion from milliamperes to amperes is essential.

   Reference: UFC 3-570-01: Cathodic Protection — B-6.2, p. 79

8. 8Why should a damaged junction box containing the connections between galvanic anodes and the protected structure be repaired?

   1. A. A broken anode connection increases the protective current delivered to the pipe
   2. B. Anodes supply the same current through soil without a metallic return connection
   3. C. Its damaged connections can interrupt the protective-current circuit
   4. D. Higher connection resistance can be ignored while the anode still has usable mass

   Answer: C

   Explanation: FIST identifies damage to "junction boxes or test stations where anodes join the structure cable" as a common problem. An open or poor connection can interrupt or restrict protective current. Remaining anode mass does not compensate for an inadequate circuit.

   Reference: FIST 4-5: Corrosion and Cathodic Protection — 10.4, p. 53

9. 9An AMPP certification holder has a financial interest that could influence a corrosion-control recommendation to a client. What do AMPP's certification-holder principles require?

   1. A. Inform the client or employer of the conflict of interest
   2. B. Disclose the interest only if the recommendation later fails
   3. C. Withhold the interest if the recommendation seems technically sound
   4. D. Treat the financial interest as irrelevant to professional judgment

   Answer: A

   Explanation: AMPP directs holders to "Inform clients or employers of any conflicts of interest". Disclosure is required when the interest might influence judgment; apparent technical merit does not remove the conflict.

   Reference: AMPP: Certification Ethics — Principles for certification holders—conflicts of interest

10. 10Which operating characteristic commonly allows an impressed-current system to accommodate changes in protective-current demand?

    1. A. Its electrolyte maintains a fixed circuit resistance
    2. B. Its anodes maintain a fixed natural driving voltage
    3. C. Its structure becomes electrically isolated as demand rises
    4. D. Its power supply normally permits output adjustment

    Answer: D

    Explanation: The UFC explains, "Nearly all ICCP systems have adjustable outputs". Adjustment allows the delivered current to be changed when demand changes; neither electrolyte resistance nor automatic isolation provides that control.

    Reference: UFC 3-570-01: Cathodic Protection — Appendix B, B-4.2.1.1, p. 65