NACE CP1 FINAL EXAM STUDY GUIDE
2026 COMPLETE QUESTIONS WITH
CORRECT DETAILED ANSWERS ||
100% GUARANTEED PASS
<RECENT VERSION>
1. corrosion - ANSWER ✔ The deterioration of a substance, usually a metal
from a reaction with its environment
2. Passivation - ANSWER ✔ A layer of oxides formed on the surface of a
metal that provides corrosion protection.
3. the elements of a corrosion cell - ANSWER ✔ Anode, cathode, metallic
pathway, electrolyte
4. what happens at the anode - ANSWER ✔ The metal dissolves into the
electrolyte
5. the function of the metallic pathway - ANSWER ✔ Allows the flow of
electrons to connect the corrosion cell
6. galvanic series - ANSWER ✔ A listing in order of reactivity ( more or less
noble) in seawater 25c
,7. The general rules of galvanic corrosion - ANSWER ✔ The less noble (more
reactive) metal when connected to a more noble (or less reactive metal) will
corrode preferentially.
8. the five most important factors that affect the rate of corrosion. - ANSWER
✔ Humidity, oxygen, chemical salts, pollutants, temperature
9. General corrosion - ANSWER ✔ Results in a relatively uniform loss of
material over the entire surface. Results in a general thinning of the affected
surface. Realively easy to inspect. Does not cause catastrophic failures.
10.Localized corrosion - ANSWER ✔ Typically pitting and crevice corrosion. It
is typically of the most concern as damage is concentrated and loss of
integrity or structure failure can result.
11.Common tool/ methods used for corrosion control. - ANSWER ✔ Design,
inhibitors, material selection, cathodic protection, protective coatings, splash
zone systems, alteration of the environment
12.Anode - ANSWER ✔ The electrode of an electrochemical cell at which
oxidation occurs. Electrons flow away from the anode in the external circuit.
Corrosion usually occurs and metal ions enter the solution at the anode.
,13.Cathode - ANSWER ✔ The electrode of an electrochemical cell at which
reduction is the principal reaction. electrons flow towards the cathode in the
external circuit.
14.Cathodic protection - ANSWER ✔ A technique to reduce the corrosion of a
metal surface by making that surface the cathode of an electrochemical cell.
15.Area of a circle - ANSWER ✔ Pi times radius squared
16.Area of a rectangle - ANSWER ✔ Length times width
17.Current decrease - ANSWER ✔ Voltage decreases if resistance stays the
same
18.Current increase - ANSWER ✔ Voltage increases resistance stays the same
19.Faraday's law - ANSWER ✔ The mass of a substance altered I am electrode
during electro sis is directly proportional to the quantity of electricity
transferred at the electrode
20.Faraday's law formula - ANSWER ✔ M = K x l x t
21.Ohm's law - ANSWER ✔ V=IR I=V/R R=V/l
If the voltage and current outputs are approximately one-half of the normal
, 22.values, the most probable cause is partial failure of ____ , however if the
_____ are found to be operating properly, the ____ should be investigated
for possible winding to winding shorts
A) rectifier case, transformer
B) transformer, rectifier stacks, rectifier case
C) rectifier stacks, rectifier stacks , transformer - ANSWER ✔ c
23.True or False, in regards to rectifier troubleshooting:
If the cathode-to-structure resistance is normal, then the problem is with the
rectifier - ANSWER ✔ f
If the ANODE-to-structure resistance is normal, then the problem is with the
rectifier
24.Which conditions can cause internal short circuits
I Failed diodes
II contact in transformer windings
III Contact between positive circuit and the rectifier cabinet or negative
circuit
IV Spark-gap type lightning arrestors failed in the shorted condition
A) I, II, III
B) I, II
2026 COMPLETE QUESTIONS WITH
CORRECT DETAILED ANSWERS ||
100% GUARANTEED PASS
<RECENT VERSION>
1. corrosion - ANSWER ✔ The deterioration of a substance, usually a metal
from a reaction with its environment
2. Passivation - ANSWER ✔ A layer of oxides formed on the surface of a
metal that provides corrosion protection.
3. the elements of a corrosion cell - ANSWER ✔ Anode, cathode, metallic
pathway, electrolyte
4. what happens at the anode - ANSWER ✔ The metal dissolves into the
electrolyte
5. the function of the metallic pathway - ANSWER ✔ Allows the flow of
electrons to connect the corrosion cell
6. galvanic series - ANSWER ✔ A listing in order of reactivity ( more or less
noble) in seawater 25c
,7. The general rules of galvanic corrosion - ANSWER ✔ The less noble (more
reactive) metal when connected to a more noble (or less reactive metal) will
corrode preferentially.
8. the five most important factors that affect the rate of corrosion. - ANSWER
✔ Humidity, oxygen, chemical salts, pollutants, temperature
9. General corrosion - ANSWER ✔ Results in a relatively uniform loss of
material over the entire surface. Results in a general thinning of the affected
surface. Realively easy to inspect. Does not cause catastrophic failures.
10.Localized corrosion - ANSWER ✔ Typically pitting and crevice corrosion. It
is typically of the most concern as damage is concentrated and loss of
integrity or structure failure can result.
11.Common tool/ methods used for corrosion control. - ANSWER ✔ Design,
inhibitors, material selection, cathodic protection, protective coatings, splash
zone systems, alteration of the environment
12.Anode - ANSWER ✔ The electrode of an electrochemical cell at which
oxidation occurs. Electrons flow away from the anode in the external circuit.
Corrosion usually occurs and metal ions enter the solution at the anode.
,13.Cathode - ANSWER ✔ The electrode of an electrochemical cell at which
reduction is the principal reaction. electrons flow towards the cathode in the
external circuit.
14.Cathodic protection - ANSWER ✔ A technique to reduce the corrosion of a
metal surface by making that surface the cathode of an electrochemical cell.
15.Area of a circle - ANSWER ✔ Pi times radius squared
16.Area of a rectangle - ANSWER ✔ Length times width
17.Current decrease - ANSWER ✔ Voltage decreases if resistance stays the
same
18.Current increase - ANSWER ✔ Voltage increases resistance stays the same
19.Faraday's law - ANSWER ✔ The mass of a substance altered I am electrode
during electro sis is directly proportional to the quantity of electricity
transferred at the electrode
20.Faraday's law formula - ANSWER ✔ M = K x l x t
21.Ohm's law - ANSWER ✔ V=IR I=V/R R=V/l
If the voltage and current outputs are approximately one-half of the normal
, 22.values, the most probable cause is partial failure of ____ , however if the
_____ are found to be operating properly, the ____ should be investigated
for possible winding to winding shorts
A) rectifier case, transformer
B) transformer, rectifier stacks, rectifier case
C) rectifier stacks, rectifier stacks , transformer - ANSWER ✔ c
23.True or False, in regards to rectifier troubleshooting:
If the cathode-to-structure resistance is normal, then the problem is with the
rectifier - ANSWER ✔ f
If the ANODE-to-structure resistance is normal, then the problem is with the
rectifier
24.Which conditions can cause internal short circuits
I Failed diodes
II contact in transformer windings
III Contact between positive circuit and the rectifier cabinet or negative
circuit
IV Spark-gap type lightning arrestors failed in the shorted condition
A) I, II, III
B) I, II
