ICC U4 UNDERGROUND STORAGE TANK CATHODIC
PRTECTION EXAM QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS) Q&A 2026
|INSTANT DOWNLOAD PDF
1. What is the main purpose of cathodic protection in
underground storage tanks?
A. Increase fuel flow rate
B. Prevent corrosion of metal surfaces
C. Improve tank insulation
D. Reduce fuel evaporation
Rationale: Cathodic protection is used to stop or reduce
electrochemical corrosion of buried metal structures.
Correct Answer: B
2. Which of the following is a common method of cathodic
protection?
A. Thermal insulation
B. Sacrificial anode system
C. Magnetic shielding
D. Pressure sealing
Rationale: Sacrificial anodes corrode instead of the tank.
Correct Answer: B
,3. In cathodic protection, the structure being protected
becomes the:
A. Anode
B. Cathode
C. Electrolyte
D. Insulator
Rationale: The protected structure is forced to act as the
cathode.
Correct Answer: B
4. What is corrosion in underground steel tanks primarily
caused by?
A. Mechanical wear
B. Electrical currents and moisture
C. UV radiation
D. High pressure
Rationale: Corrosion is an electrochemical process involving
moisture and soil electrolytes.
Correct Answer: B
5. Which material is commonly used for sacrificial anodes?
A. Copper
B. Aluminum or magnesium
,C. Plastic
D. Glass
Rationale: Magnesium and aluminum are more active metals.
Correct Answer: B
6. What does a rectifier do in an impressed current system?
A. Measures corrosion
B. Converts AC to DC power
C. Stores electricity
D. Filters soil moisture
Rationale: Rectifiers convert alternating current to direct
current.
Correct Answer: B
7. Impressed current cathodic protection uses:
A. Natural corrosion
B. External power source
C. Solar heat
D. Chemical coatings only
Rationale: ICCP systems require an external DC power source.
Correct Answer: B
8. What is the electrolyte in underground tank systems?
, A. Air
B. Soil or groundwater
C. Steel
D. Fuel
Rationale: Soil moisture acts as electrolyte for corrosion
reactions.
Correct Answer: B
9. A reference electrode is used to measure:
A. Fuel level
B. Electrical potential
C. Tank volume
D. Soil density
Rationale: It measures electrical potential differences for CP
testing.
Correct Answer: B
10. The most common reference electrode used is:
A. Zinc rod
B. Copper-copper sulfate electrode
C. Iron nail
D. Aluminum plate
PRTECTION EXAM QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS) Q&A 2026
|INSTANT DOWNLOAD PDF
1. What is the main purpose of cathodic protection in
underground storage tanks?
A. Increase fuel flow rate
B. Prevent corrosion of metal surfaces
C. Improve tank insulation
D. Reduce fuel evaporation
Rationale: Cathodic protection is used to stop or reduce
electrochemical corrosion of buried metal structures.
Correct Answer: B
2. Which of the following is a common method of cathodic
protection?
A. Thermal insulation
B. Sacrificial anode system
C. Magnetic shielding
D. Pressure sealing
Rationale: Sacrificial anodes corrode instead of the tank.
Correct Answer: B
,3. In cathodic protection, the structure being protected
becomes the:
A. Anode
B. Cathode
C. Electrolyte
D. Insulator
Rationale: The protected structure is forced to act as the
cathode.
Correct Answer: B
4. What is corrosion in underground steel tanks primarily
caused by?
A. Mechanical wear
B. Electrical currents and moisture
C. UV radiation
D. High pressure
Rationale: Corrosion is an electrochemical process involving
moisture and soil electrolytes.
Correct Answer: B
5. Which material is commonly used for sacrificial anodes?
A. Copper
B. Aluminum or magnesium
,C. Plastic
D. Glass
Rationale: Magnesium and aluminum are more active metals.
Correct Answer: B
6. What does a rectifier do in an impressed current system?
A. Measures corrosion
B. Converts AC to DC power
C. Stores electricity
D. Filters soil moisture
Rationale: Rectifiers convert alternating current to direct
current.
Correct Answer: B
7. Impressed current cathodic protection uses:
A. Natural corrosion
B. External power source
C. Solar heat
D. Chemical coatings only
Rationale: ICCP systems require an external DC power source.
Correct Answer: B
8. What is the electrolyte in underground tank systems?
, A. Air
B. Soil or groundwater
C. Steel
D. Fuel
Rationale: Soil moisture acts as electrolyte for corrosion
reactions.
Correct Answer: B
9. A reference electrode is used to measure:
A. Fuel level
B. Electrical potential
C. Tank volume
D. Soil density
Rationale: It measures electrical potential differences for CP
testing.
Correct Answer: B
10. The most common reference electrode used is:
A. Zinc rod
B. Copper-copper sulfate electrode
C. Iron nail
D. Aluminum plate
