This article is about Plumbing qc questions answers which is based on CBT test of aramco. We collected questions who have passed CBT Exam of Aramco Plumbing QC Inspector.
Cathodic Protection Aramco QC Interview Question
Question 1: What is the minimum recommended size for the primary positive and negative DC cables from the rectifier?
a) 20 mm² (#6 AWG)
b) 25 mm² (#4 AWG)
c) 30 mm² (#2 AWG)
d) 35 mm² (#1 AWG)
The correct answer is: b) 25 mm² (#4 AWG)
Question 2: What is the function of the primary positive and negative DC cables from the rectifier?
a) To ground the system
b) To transmit AC power to the rectifier
c) To convert AC power to DC power
d) To carry DC current from the rectifier to the load
The correct answer is: d) To carry DC current from the rectifier to the load
Question 3: What is the purpose of cathodic protection cables?
a) To provide power to the system
b) To protect the system from corrosion
c) To transmit data from the system
d) To provide grounding for the system
The correct answer is: b) To protect the system from corrosion
Question 4: What is the recommended standard for sizing cathodic protection cables?
a) National Fire Protection Association NFPA 30
b) National Fire Protection Association NFPA 70
c) International Fire Code (IFC)
d) International Building Code (IBC)
The correct answer is: b) National Fire Protection Association NFPA 70
Question 5: What is the purpose of sizing the bond conductor appropriately?
a) To limit voltage drop across the conductor
b) To provide power to the system
c) To increase system efficiency
d) To reduce the risk of overloading
The correct answer is: The bond conductor shall be sized to achieve a voltage drop across the conductor of less than 0.05 volt and shall be minimum 16 mm² (#6 AWG).
Question 6: What is the recommended action for handling impressed current anodes and cables?
a) Roll, pull and twist the anode and anode cable
b) Lower the anode with the anode cable
c) Strain the cable where it protrudes from the anode
d) Do not perform any action that may strain the cable where it protrudes from the anode
The correct answer is: d) Do not perform any action that may strain the cable where it protrudes from the anode
Question 7: What is the purpose of impressed current anodes?
a) To protect the structure from overvoltage
b) To provide grounding for the system
c) To reduce the risk of electrical shock
d) To protect the structure from corrosion
The correct answer is: d) To protect the structure from corrosion
Question 8: What is the purpose of inspecting the ICCP anode cables for insulation damage?
a) To ensure proper system grounding
b) To reduce the risk of overloading
c) To protect the anode from corrosion
d) To prevent electrical shock hazards
The correct answer is: d) To prevent electrical shock hazards
Question 9: What is the recommended inspection method for ICCP anode cables for below grade usage?
a) Visual inspection only
b) Conducting an electrical continuity test
c) Using a pulse type holiday detector set at 18,000 volts DC
d) Measuring the resistance of the cable
The correct answer is: c) Using a pulse type holiday detector set at 18,000 volts DC
Question 10: How should each impressed current anode be connected to the positive circuit of the respective rectifier?
a) Through a shared anode lead wire
(4.6mts)
b) Through an individual anode lead wire connected through a dedicated shunt
c) Through a shared cathode lead wire
d) Through an individual cathode lead wire connected through a dedicated shunt
The correct answer is: b) Through an individual anode lead wire connected through a dedicated shunt
Question 11: Where should the anode junction box be mounted?
a) Near the cathode
b) Near the anode
c) Near the rectifier
d) Anywhere along the circuit
The correct answer is: b) Near the anode
Question 12:What is the maximum length of buried main positive cable runs allowed between the rectifier and anode bed junction box?
a) 50 meters
b) 100 meters
c) 150 meters
d) 300 meters
The correct answer is: c) 150 meters
Question 13: Where should all splices be made for buried main positive cable runs exceeding 150 meters in length?
a) In below-grade splice boxes
b) In above-grade splice boxes
c) Directly on the anode bed
d) In a nearby cathode bed
The correct answer is: b) In above-grade splice boxes
Question 14: How far can negative cables attached to above-grade structures extend out of the conduit between the conduit and the structure connection?
a) Up to 100 mm
b) Up to 250 mm
c) Up to 500 mm
d) Up to 1000 mm
The correct answer is: a) c) Up to 500 mm
Question 15: What size copper ground conductor is required for the external ground terminal of each rectifier?
a) 10 mm² (#8 AWG)
b) 16 mm² (#6 AWG)
c) 25 mm² (#4 AWG)
d) 35 mm² (#2 AWG)
The correct answer is: c) 25 mm² (#4 AWG)
Question 16: Where is the internal equipment grounding terminal located on each rectifier?
a) Adjacent to the DC terminal block
b) Adjacent to the AC terminal block
c) Inside the rectifier housing
d) On the back of the rectifier
The correct answer is: b) Adjacent to the AC terminal block
Question 17:What types of cables are permitted for use as negative and bond cables?
a) Steel and aluminum only
b) HMWPE, THHN, THWN, RHH-RHW, or USE type
c) PVC and rubber only
c) PVC and rubber only
The correct answer is: b) HMWPE, THHN, THWN, RHH-RHW, or USE type
Question 18: What is the required stranding class for copper conductors in the negative and bond cables?
a) Class A per ASTM B8 or Class 1 per IEC 60228
b) Class B per ASTM B8 or Class 3 per IEC 60228
c) Class C per ASTM B8 or Class 2 per IEC 60228
d) Class D per ASTM B8 or Class 4 per IEC 60228
The correct answer is: c) Class C per ASTM B8 or Class 2 per IEC 60228
Question 19:Which of the following is not included as an anode cable for onshore cathodic protection systems?
a) Buried Pipelines (SAES-X-400)
b) Vessel and Tank Internals (SAES-X-500)
c) Offshore Platforms (SAES-X-200)
d) Plant Facilities (SAES-X-600)
The correct answer is: c) Offshore Platforms (SAES-X-200)
Question 20: Which SAES governs the anode cables for onshore well casings?
a) SAES-X-400
b) SAES-X-500
c) SAES-X-600
d) SAES-X-700
The correct answer is: d) SAES-X-700