Day 4 Quiz Flashcards
An adverse effect of stray DC current discharging from a metal into an electrolyte is the
A. Loss of current to the foreign source of the current
B. Loss of current to the structures cathodic protection system
C. Loss of metal from the structure
D. Gain of metal on the foreign structure
C
Typical sources of stray current
A. Cathodic protection systems
B. DC transit system
C. Resistance bonds
D. Telluric currents
Choose all that apply
A
B
D
Stray current corrosion can be controlled by
A. Relocating current source
B. Removing current source
C. Cathodic protection
D. Mitigation bonds
Choose all that apply
A
B
C
D
The reason to monitor a cathodic protection system includes which of the following
A. Maintain corrosion control of the structure since cathodic protection is only effective when opening
B. If a regulated structure, to be in compliance with the code and regulations showing due diligence
C. If not a regulated structure to operate in accordance with industry standards showing due diligence
D. To help keep the staff operating the structure employed
Choose all that apply
A
B
C
Routine monitoring of a cathodic protection system usually does not include
A. Moisture contents around the anodes
B. Structure to electrolyte potentials
C. Rectified voltage and current output
D. Interference control bond current
A
Which of the following tests are routinely completed on a cathodic protection system to ensure that it is operating?
A. Structure to electrolyte potentials
B. Voltage and current output of DC power source
C. Current output of galvanic anodes
D. Current magnitude and direction in mitigation bonds
Choose all that apply
A
B
C
D
Metallic shorts to a structure with cathodic protection will normally result in
A. lower current resistance, lower current output and an increase in protection
B. Higher current resistance, lower current output and an increase in protection
C. lower current resistance, higher current output and a decrease in protection
D. higher current resistance, higher current output and a decrease in protection
C
When servicing a rectifier which of the following practices should be followed
A. Test the case for voltage before contacting
B. Listen for unusual noises
C. Look for discoloration and vent obstructions
D. Smell for unusual odors
Choose all that apply
A
B
C
D
The following trouble in an impressed current system would give a normal DC voltage and zero 0 current output
A. Faulty transformer
B. Broken cable to the anodes
C. No AC supply
D. Faulty rectifying elements
B
A deep anode is
A. Installed horizontally at 5 meter deep
B. Installed vertically at 5 meters deep
C. Installed at 15 meters or more below the surface
D. Distributed along the surface
C
Above which value is a structure AC voltage to ground considered hazardous
A. 5 volts AC at half power line load
B. 5 volts AC at full power line load
C. 10 volts AC at full power line road
D. 15 Volts AC at full power line road
D
Approaching the rectifier case one should first
A. Unlock the padlock
B. Touch the case with the back of the hand
C. Check the rectifier for AC case to ground voltage
D. Open the case without concern
C
When a rectifier is ready to be turned on the lock out tag out is to be removed by
A. the supervisor only
B. the last person completing the work
C. the person installing the lock out tag out
D. any person that worked on the rectifier
C
You must have a SDS sheet if caring the following materials
A. Carbon Coke breeze
B. Copper sulfate
C. Solvents
D. Acids
choose all that apply
A
B
C
D
