AMPP Cathodic Protection Specialist 1 Certification Exam |
Complete Exam Questions with Verified Correct Answers and
Detailed Explanations – Latest Update 2026/2027 /Graded A+
Question 1
What is the primary purpose of a cathodic protection system?
A. Increase the corrosion rate of a metal structure
B. Reduce or prevent corrosion of a metal structure by making it the cathode
of an electrochemical cell
C. Remove all coatings from a buried pipeline
D. Increase the electrical resistance of the protected structure
Correct Answer: B. Reduce or prevent corrosion of a metal structure by
making it the cathode of an electrochemical cell
Explanation:
Cathodic protection (CP) works by supplying current to a metal structure so
that the structure becomes the cathode of an electrochemical corrosion cell.
By shifting the electrochemical conditions in the cathodic direction, the
oxidation reaction responsible for metal loss is reduced. CP is commonly used
on pipelines, tanks, offshore structures, and other metallic assets exposed to
electrolytes.
Question 2
In an electrochemical corrosion cell, oxidation occurs at the:
A. Cathode
B. Anode
C. Reference electrode only
D. Voltmeter
Correct Answer: B. Anode
Explanation:
Oxidation occurs at the anode. During corrosion, metal atoms at anodic
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,locations lose electrons and enter the electrolyte as ions. The electrons then
travel through the metallic path toward cathodic areas, where reduction
reactions occur.
Question 3
Which statement correctly describes reduction?
A. Loss of electrons
B. Gain of electrons
C. Loss of metal ions only
D. Movement of ions through a metallic conductor
Correct Answer: B. Gain of electrons
Explanation:
Reduction is defined as the gain of electrons. A useful way to remember the
distinction is OIL RIG: Oxidation Is Loss, Reduction Is Gain. In a corrosion cell,
reduction occurs at the cathode.
Question 4
What is the function of an electrolyte in an electrochemical corrosion cell?
A. Provide an ionic path for current flow
B. Prevent all chemical reactions
C. Provide the metallic path for electrons
D. Act as an insulating coating
Correct Answer: A. Provide an ionic path for current flow
Explanation:
An electrolyte is a medium containing mobile ions that permits ionic current
to flow. Soil, seawater, and many aqueous solutions can act as electrolytes. In
a corrosion cell, electrons travel through the metallic path while ions move
through the electrolyte.
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,Question 5
Which of the following is required for a conventional electrochemical
corrosion cell to operate?
A. Anode, cathode, electrolyte, and metallic/electrical path
B. Cathode and paint only
C. Anode and dry air only
D. Reference electrode and voltmeter only
Correct Answer: A. Anode, cathode, electrolyte, and metallic/electrical
path
Explanation:
A functioning corrosion cell requires an anodic region, a cathodic region, an
electrolyte, and a conductive path that permits electron flow between the
anodic and cathodic areas. Removing or interrupting one of these essential
components can reduce or stop the corrosion process.
Question 6
Which electrode is the location where metal dissolution occurs during a
typical corrosion reaction?
A. Cathode
B. Anode
C. Reference electrode
D. Test lead
Correct Answer: B. Anode
Explanation:
The anode is the location where oxidation occurs. For a metal such as iron,
atoms can undergo a reaction such as:
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, [
Fe \rightarrow Fe^{2+}+2e^-
]
The iron loses electrons and enters the electrolyte as an ion. This anodic
reaction is directly associated with metal loss.
Question 7
In a cathodically protected pipeline, what is the intended electrochemical role
of the pipeline?
A. Anode
B. Cathode
C. Electrolyte
D. Sacrificial anode
Correct Answer: B. Cathode
Explanation:
Cathodic protection is designed to make the protected structure behave as the
cathode. Current is supplied to the structure from an anode system, reducing
the tendency for the structure itself to undergo oxidation and corrosion.
Question 8
Which type of cathodic protection uses a more active metal connected directly
to the structure without an external DC power source?
A. Impressed-current cathodic protection
B. Galvanic cathodic protection
C. Alternating-current protection
D. Dielectric isolation
Correct Answer: B. Galvanic cathodic protection
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Complete Exam Questions with Verified Correct Answers and
Detailed Explanations – Latest Update 2026/2027 /Graded A+
Question 1
What is the primary purpose of a cathodic protection system?
A. Increase the corrosion rate of a metal structure
B. Reduce or prevent corrosion of a metal structure by making it the cathode
of an electrochemical cell
C. Remove all coatings from a buried pipeline
D. Increase the electrical resistance of the protected structure
Correct Answer: B. Reduce or prevent corrosion of a metal structure by
making it the cathode of an electrochemical cell
Explanation:
Cathodic protection (CP) works by supplying current to a metal structure so
that the structure becomes the cathode of an electrochemical corrosion cell.
By shifting the electrochemical conditions in the cathodic direction, the
oxidation reaction responsible for metal loss is reduced. CP is commonly used
on pipelines, tanks, offshore structures, and other metallic assets exposed to
electrolytes.
Question 2
In an electrochemical corrosion cell, oxidation occurs at the:
A. Cathode
B. Anode
C. Reference electrode only
D. Voltmeter
Correct Answer: B. Anode
Explanation:
Oxidation occurs at the anode. During corrosion, metal atoms at anodic
1|Page
,locations lose electrons and enter the electrolyte as ions. The electrons then
travel through the metallic path toward cathodic areas, where reduction
reactions occur.
Question 3
Which statement correctly describes reduction?
A. Loss of electrons
B. Gain of electrons
C. Loss of metal ions only
D. Movement of ions through a metallic conductor
Correct Answer: B. Gain of electrons
Explanation:
Reduction is defined as the gain of electrons. A useful way to remember the
distinction is OIL RIG: Oxidation Is Loss, Reduction Is Gain. In a corrosion cell,
reduction occurs at the cathode.
Question 4
What is the function of an electrolyte in an electrochemical corrosion cell?
A. Provide an ionic path for current flow
B. Prevent all chemical reactions
C. Provide the metallic path for electrons
D. Act as an insulating coating
Correct Answer: A. Provide an ionic path for current flow
Explanation:
An electrolyte is a medium containing mobile ions that permits ionic current
to flow. Soil, seawater, and many aqueous solutions can act as electrolytes. In
a corrosion cell, electrons travel through the metallic path while ions move
through the electrolyte.
2|Page
,Question 5
Which of the following is required for a conventional electrochemical
corrosion cell to operate?
A. Anode, cathode, electrolyte, and metallic/electrical path
B. Cathode and paint only
C. Anode and dry air only
D. Reference electrode and voltmeter only
Correct Answer: A. Anode, cathode, electrolyte, and metallic/electrical
path
Explanation:
A functioning corrosion cell requires an anodic region, a cathodic region, an
electrolyte, and a conductive path that permits electron flow between the
anodic and cathodic areas. Removing or interrupting one of these essential
components can reduce or stop the corrosion process.
Question 6
Which electrode is the location where metal dissolution occurs during a
typical corrosion reaction?
A. Cathode
B. Anode
C. Reference electrode
D. Test lead
Correct Answer: B. Anode
Explanation:
The anode is the location where oxidation occurs. For a metal such as iron,
atoms can undergo a reaction such as:
3|Page
, [
Fe \rightarrow Fe^{2+}+2e^-
]
The iron loses electrons and enters the electrolyte as an ion. This anodic
reaction is directly associated with metal loss.
Question 7
In a cathodically protected pipeline, what is the intended electrochemical role
of the pipeline?
A. Anode
B. Cathode
C. Electrolyte
D. Sacrificial anode
Correct Answer: B. Cathode
Explanation:
Cathodic protection is designed to make the protected structure behave as the
cathode. Current is supplied to the structure from an anode system, reducing
the tendency for the structure itself to undergo oxidation and corrosion.
Question 8
Which type of cathodic protection uses a more active metal connected directly
to the structure without an external DC power source?
A. Impressed-current cathodic protection
B. Galvanic cathodic protection
C. Alternating-current protection
D. Dielectric isolation
Correct Answer: B. Galvanic cathodic protection
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