Take A Free NACE CP 2 Technician Exam Practice Test

Here you can take the free NACE CP 2 Technician Exam Practice Test with the latest Cathodic Protection Technician (CP 2) Exam Questions and Answers

Q: How much CP current is required to protect a buried steel storage tank that is 3 m diameter by 6 m long and coated (i.e. 4% bare) in 8,500 Ωꞏcm soil based on a design CP current density of 20 mA/m2 of exposed steel surface area?

a. 45 mA

b. 51 mA

c. 57 mA

d. 1.27 A

Math – Algebra, Geometry, Logic, Unit Conversions
Q: What is the weight of a steel rod that is 50 mm in diameter by 3 feet long?
Given: 1 inch = 2.54 cm;1 foot = 12 inches, 1 kg = 2.205 lb, 1 cm³ of steel = 8 g

a. 3.25 lb

b. 3.69 kg

c. 11.6 kg

d. 31.7 lb

Q: Point A on a pipeline is 16 km upstream of Point B. There are no sources of DC current connected to the pipeline between these two points. The line current measured at Point
A is 6.3 A upstream and the line current measured at Point B is 2.4 A downstream. How much CP current is being picked up or discharged along the pipeline between Points A & B?

a. 3.9 A pick-up

b. 3.9 A discharge

c. 6.3 A pick-up

d. 8.7 A pick-up

Q: Which of the following are depolarizers?

A. Dissolved oxygen

B. increased electrolyte velocity

C. bacteria action

D. A, B, and C.

Q: Polarization occurs

a. at the anode surface only

b. at the cathode surface only

c. at the anode and cathode surfaces

d. in the metallic path

Q: Which of the following factors affect polarization?

a. current

b. ion concentration

c. anode/cathode ratio

d. temperature

E. All of the above

Q: Which of the following are types of polarization?

A. concentration

B. activation

C. temperature

D. A and B

Q: The measure of the electrochemical difference between two metals in an electrolyte is which of the following?

a. amps

b. volts

c. ohms

d siemans

What is the current in a 91 m (300 ft) span of 762 mm (30 in) pipe weighing 176.65 kg/m 118.7 lb/ft), if the voltage drop across that span is 0.62 mV?

A. 0.850 A

B. 1.176 A

C. 2.802 A

D. 2.585 A

10.

Q: The relationship between current and polarization is described by which of the following?

A. Corrosion cell current decreases with increased polarization

B. polarization increases with increased current

C. current increases with increased polarization

D. A and B only

11.

Q: A passivating material will exhibit which of the following properties?

A. does not corrode at all

B. corrosion increases as current increases initially

C. corrosion current decreases after a certain point

D. corrosion current increases beyond the passive region

E. B, C, and D only

12.

When an ammeter with an internal resistance of 0.15 Ω is inserted into a circuit that is normally operating at 5 V and 20 A, what will the ammeter current read?

A. 0.08 A

B. 10 A

C. 12.5 A

D. 50 A

13.

Q: In a standard emf series of metals, which of the following is represented?

a. the potential of metal is measured in a saturated solution of copper-sulfate

b. current is measured between the noblest and most active metals

c. the potential is measured with respect to a standard hydrogen electrode

d. the total number of electrons is determined

14.

Stray Current
Q: At which location(s) in Figure 15 is corrosion expected due to stray current?

a. 1 & 2 only

b. 1, 3 & 5 only

c. 2, 4 & 6 only

d. 3 & 5 only

15.

Q: If two different metals are connected together in an electrolyte, the metal with the

a. most negative potential is the cathode

b. the most positive potential is the cathode

c. positive potential will corrode

d. highest valence is the anode

16.

Q: In a practical galvanic series of metals, which of the following is represented?

a. the potential between two different metals in the series is measured

b. the current is measured between two of the metals in the series

c. the electrolyte contains metal ions of that metal

d. the potential of metals in a common electrolyte

17.

Q: A corrosion cell can form under which of the following conditions?

a. a difference in temperature where the higher temperature is the cathode

b. a difference in oxygen where the highest concentration of oxygen is at the anode

c. a difference in metals where the anode is at the noblest metal

d. a difference in salt concentration where the anode is at the highest ion concentration

18.

Q: When bare metal passes under a paved road surface,

a. an oxygen concentration corrosion cell can develop with the metal under the pavement being the anode

b. an oxygen concentration cell can develop with the metal outside the pavement being the anode

c. a temperature corrosion cell can develop with the metal outside the pavement being the anode

d. a high salt concentration at the edge of the pavement with the metal under the pavement being the anode

19.

Q: An environment where cathodic protection is NOT effective is

a. liquid

b. soil

c. atmospherically exposed surface

d. steel in concrete

20.

Q: The cathodic protection criteria for steel includes which of the following?

A. a potential of -850 mVCSE or more negative with current applied after IR drop is considered

B. a polarized potential of -850mVCSE or more negative

C. polarization of 100 mV or greater

D. a polarized potential of -790 mv AgAgCl or more negative

E. all of the above

21.

Q: When cathodic protection is applied to a corroding steel surface, it shifts the corrosion cell potential?

a. no change in potential

b. cathode is more negative

c. cathode more positive

d. anode more positive

22.

Q: Cathodic protection polarizes

a. the potential of the structure anode to the structure cathode potential

b. the potential of the structure cathode to the structure anode potential

c. the potential of the structure cathode to the CP anode potential

d. the cp anode potential to the structure cathode potential

23.

Q: The current requirement for cathodic protection of a structure will increase with a

a. decrease in pH

b. decrease in temperature

c. decrease in oxygen

d. decrease in velocity

24.

Q: In a galvanic anode system, the driving voltage is due to the

a. electrolyte itself

b. anode to structure a couple in the electrolyte

c. connection to the structure

d. anode backfill

25.

Meter Operation

Q: Referring to Figure 14, select the correct configuration to measure the 50mA output current of a galvanic anode with a ‘positive’ meter indication.

26.

Q: Referring to Figure 14, select the recommended configuration for pipe-to-soil potential measurements to assess protection.

27.

Q: Which is NOT a primary reaction at the anode?

a. metal oxidation

b. oxygen evolution

c.chloride evolution

d. hydrogen evolution

28.

Q: Which of the following will decrease cathodic protection current requirements?

a. increased pH

b. increased oxygen

c. increased temperature

d. increased agitation

29.

Q: A galvanic anode system is NOT normally suitable in which of the following conditions?

a. when a small amount of current is required

b. in high soil resistivity

c. for localized protection

d. for interference mitigation

30.

Q: The purpose of the galvanic anode backfill is NOT to

a. prevent passivation of the anode

b. create uniform corrosion of the anode

c. passivate the anode

d. provide a low resistivity environment around the anode

31.

Q: The elements of a galvanic cathodic protection system in soil include which of the following?

A. active material

B. noble structure

C. carbon backfill

D. wiring

E. A, B, and D only

32.

Q: An impressed current system is NOT normally practical under which of the following conditions

a. with very small current requirements

b. for protection of poorly coated and bare structures

c. in high soil resistivity

d. inside water storage tanks

33.

Q: Rectifier components could include which of the following?

A. Transformer

B. Photovaltaic cells

C. A and D only

D. silicon diodes

34.

Q: Which of the following DC power supplies are commonly used to charge batteries that in turn provide cathodic protection current?

A. thermoelectric genorators

B. solar

C. wind-driven generator

D. B and C only

35.

Q: A transformer will

A. change AC to DC

B. increase the DC voltage only

C. decrease the ac voltage only

D. increase or decrease the AC supply voltage

36.

Q: If the primary AC voltage is 100 Volts AC, and there are 100 primary windings with 200 secondary windings, what is the secondary voltage?

A. 25 volts AC

B. 50 Volts AC

c. 100 volts AC

d. 200 Volts AC

37.

Shunt Measurements

Q: What is the shunt current magnitude & direction for the measurement shown in Figure 13?
Current Direction

38.

Q: What would the meter in Figure 13 display if the shunt current was 40 A from Right-to-Left?

a. -25 mV

b. +25 mV

c. -40 mV

d. +40 mV

39.

Q: With a single diode installed in series with an AC voltage source the results will be

a. half wave AC voltage

b. halfwave DC voltage

c. full wave AC voltage

d. full wave DC voltage

40.

Q: Full wave rectification can be achieved with

A. a four-diode bridge circuit

B. a center tap configuration

C. one silicon-controlled rectifier

D. two silicon-controlled rectifiers and two diodes in a bridge

E. A, B, and D only

41.

Q: What is the purpose of a “free-wheeling” diode?

a. to prevent latching of the SCR

b. to improve the efficiency of the rectifier

c. to convert AC to DC

d. to increase or decrease the AC voltage

42.

Q: The advantage of three-phase rectifiers over single-phase rectifiers is that they

a. are more efficient

b. have lower initial cost

c. are easier to troubleshoot

d. are easier to adjust

43.

Q: Which DC power supply converts heat energy directly to electrical energy?

a. transformer-rectifier

b. solar

c. thermoelectric generator

d. wind-driven generator

44.

Q: A constant potential rectifier provides a constant

a. voltage output

b. voltages between taps

c. structure-to-electrolyte potential

d. potential to the SCR

45.

Q: What is the pipe-to-earth resistance of a 3 km (1.86 mi) section of 32 cm (12.75 in) diameter pipe that has a 4-wire current span at each end with the following data?

Eon TS1 = -1320 mV	Eon TS2 = -1240 mV
Eoff TS1 = -1000 mV	Eoff TS2 = -1080 mV
Ion TS1 = 3.0 A	Ion TS2 = 2.6 A
Ioff TS1 = 1.0 A	Ioff TS2 = 1.0 A

A. 0.052 Ω

B. 0.076 Ω

C. 0.15 Ω

D. 0.60 Ω

46.

Q: A structure-to-electrolyte potential measures the potential difference between

a. two different structures acting as electrodes

b. the structure and a standard reference electrode

c. the structure and the anode

d. two different points on the structure

47.

Q: A close interval potential survey is a test where structure-to-electrolyte potentials are measured

a. at 1 to 5-meter spacing along a pipeline

b. at 1 to 3 km spacing along a pipeline

c. at the quarter points around a large tank

d. close to the DC power source

48.

Q: Polarized potentials are measured

a. when the rectifiers are ON

b. just after the rectifiers are turned OFF

c. after the rectifiers are left off for several days

d. just after the rectifiers are turned ON

49.

Soil Resistivity

Q: Assuming the measurement shown in Figure 9 is from a Wenner 4-Pin arrangement with 1.5 m spacing between pins, what is the corresponding soil resistivity?

A. 66 Ωꞏm

B. 660 Ωꞏcm

C. 6,600 Ωꞏm

D. 66,000 Ωꞏcm

E. 660,000 Ωꞏm

50.

Q: Polarization is determined by

a. subtracting the ON from the instant OFF potential.

b. measuring the instant OFF potential.

c. subtracting the instant OFF from the Native (free corroding) potential.

d. subtracting the IR drop from the ON potential.

51.

Q: Assuming the measurement shown in Figure 11 is for the soil box as shown in Figure 12 having a soil cross-sectional area (A) of 12 cm²and length (L) of 120mm between the red terminals, what is the corresponding soil resistivity?

A. 0.35 Ωꞏm

B. 3.5 Ωꞏm

C. 35 Ωꞏcm

D. 35 Ωꞏm

52.

Q: What is the current in a 91 m (300 ft) span of 762 mm (30 in) pipe weighing 176.65 kg/m (118.7 lb/ft), if the voltage drop across that span is 0.62 mV?

a. 0.850 A

b. 1.176 A

c. 2.802 A

d. 2.585 A

53.

Q: Structure-to-electrolyte potentials can be used for which of the following purpose(s)?

A. Confirm if a CP potential criterion is met

B. Locate anodic areas on non-cp pipelines

C. determine the resistivity of the soil

D. locate stray current

E. A, B, and D only

54.

Q: Which of these would clearly indicate that a tank is isolated?

a. a structure-to-electrolyte potential of -950 mV_cse with the electrode at the pipe and a tank-to-electrolyte potential of -800mV_cse with the electrode at the tank

b. a structure-to-electrolyte potential of -950 mV_csewith the electrode at the pipe and a tank-to-electrolyte potential of -940 mV_cse with the electrode at the tank

c. a structure-to-electrolyte potential of -950 mV_cse with the electrode at the pipe and a tank-to-electrolyte potential of -800 mV_cse with the electrode at the pipe.

d. a structure-to-electrolyte potential of -650 mV_csewith the electrode at the pipe and a tank-to-electrolyte potential of -640mV_csewith the electrode at the tank

55.

Q: For steel in concrete what is the probability of corrosion at a potential of -370mV_cse?

a. no corrosion

b. <5%

c. 50%

d. >95%

56.

Q: If current being impressed onto a structure is causing a potential gradient of 50 mv per meter (average_ and the reference electrode is 3 m from the structure, what is the potential being measured if the true potential at the structure is -800 mV?

a. -150 mV

b. -300 mV

c. -950 mV

d. +950 mV

57.

Q: With proper instrumentation, a dual soil coupon can be used to predict which of the following?

A. The potential of the pipe surface at the location of the coupon

B. the polarized potential of a coating holiday of a given size at the location

C. The amount of polarization of a coating holiday of a given size at the location

D. The amount of CP currently pick up on a coating holiday of a given size at the location

E. B, C, and D only

58.

Q: An electrolytic couple between a pipe and a casing

A. shields CP current from the pipeline

B. causes a high current demand due to the casing

C. allows CP current to access the pipeline

D. causes corrosion on the outside of the casing

59.

Q: With sufficient current applied to a pipeline that has an electrolytic couple to the casing, the potentials will

A. shift electropositively on the outside of the casing

B. shift electropositively on the pipe inside the casing

C. Shift electropositively on the inside of the casing

D. will be the same on the pipe and the casing

60.

Q: A stray current is a current that

A. goes back and forth

B. goes in an unintended path

C. goes only to a pipeline

D. does not complete a circuit

61.

Potential Measurements, Criteria, & Isolation

Q: In Figure 3, which potential is used to evaluate the -850 mV_cse potential criterion?

a. 5 only

b. 4 only

c. 4 to 5

d. 3 to 4

62.

Q: In Figure 3, which potential is used to evaluate 100 mV polarization criteria?

a. 5 only

b. 4 only

c. 4 to 5

d. 3 to 4

63.

Q: Which measured potential below is most likely for new unprotected steel in moist soil?

a. +150 mV_cse

b. -358 mV_cse

c. -620 mV_cse

d. -830 mV_cse

64.

Q: Referring to the cased crossing in Figure 4, if the IR-free polarized potentials of the Pipe & Casing are as shown, which of the following conditions most likely exists?

65.

Q: Referring to Figure 5, if the indicated potentials are measured while the CP system is on, which of the following conditions is confirmed?

66.

Q: Referring to the TR panel in Figure 7, what is the DMM in Figure 6 most likely measuring?

a. Voltage at 1 to 2

b. Voltage at 5 only

c. Voltage at 8 to 9

d. Voltage at 10 only

67.

Q: Referring to the TR panel in Figure 7, which most accurately describes component IDs?

68.

Q: Referring to Figure 8, which value will DMM display when connected as shown?

a. 27 A

b. 2.7 A

c. 2.7 mV

d. 0.027 V

69.

Q: A mitigation control bond should be designed to

A. carry the necessary current

B. restrict the current to that required to mitigate the problem

C. keep the current going in one direction if necessary

D. return the potential on the interfered-with structure

to its pre-interference state
E. A, B, C, and D.

70.

Q: A mitigation bond may cause more problems under which of the following conditions?

A. where the interfering structure bond point is more electropositive than the interfered with structure
structure

B. where the interfering structure bond point is more electronegative than the interfered with

C. where there are more than one, or changing, current discharge points

D. where the interfering structure bond point potential varies from being more electronegative to more electropositive than the interfered-with structure

E. A, C, and D only

71.

Q: AC voltages on pipelines do NOT result from

A. resistive (conductive) coupling

B. electrostatic (capacitive) coupling

C. electromagnetic induction coupling

D. thermodynamic coupling

72.

Q: On a cathodically protected pipeline, AC corrosion can be expected at which current densities?

A. 20 mA/m^2

B. 10 A/m^2

C. 110 A/m^2

D. 200 A/m^2

E. C and D only

73.

Q: The AC voltage-to-ground on a section of pipeline paralleling AND crossing a power line tends to be the highest

A. where the power line and pipeline cross

B. point where the power line and pipeline separate

C. A gradient mat or a grid around above-ground structures

D. A remote ground away from the parallel section

E. A and B only

74.

Q: Methods of lowering hazardous AC voltages include installing which of the following?

A. grounds at the discontinuities between the power line and pipeline

B. A bond to the steel power line tower

C. a gradient mat or a grid around aboveground structures

D. a remote ground away from the parallel section

E. A and C only

75.

Q: A polarization cell is used to

A. polarize the pipeline

B. polarize the electrical ground

C. provide DC coupling but block AC

D. provide AC coupling but block DC

76.

Q: Tests for interference can be indicated by which of the following?

A. Structure-to-electrolyte potential changes

B. Changes in line current magnitude or direction

C. Localized pitting in areas near or immediately adjacent to a foreign structure

D. breakdown of protective coatings in a localized area

E. A, B, C, and D

77.

Q: When an AC voltage of 13 V is measured on a pipeline, what course of action should be taken?

A. Wait until next year and take an AC voltage to confirm it has not changed

B. Contact the power company to determine what percent of load the power line is operating

C. Advise other personnel that a near hazardous situation exists on the pipeline

D. Advise the owner or supervisor that an AC mitigation program should be investigated

E. B, C, and D

78.

Q: The purpose of a gradient mat is to

A. electrically ground the pipe to the earth to eliminate the AC voltage

B. bring the voltage difference between the pipe and the earth close to 0 Vac

C. provide cathodic protection to large structures such as tank bottoms

D. to eliminate the earth gradient to obtain a true polarized potential

79.

Reference Electrode Conversions

Given: Potential of Zinc Reference (ZRE) = -1116 mV_CSE

Potential of Silver Chloride Reference (SSC) = -60 mV_CSE

Q: If a polarized pipe potential of +240 mV was measured using ZRE, what would the measured potential be if a CSE was used?

a. -560 mV_CSE

b. -816 mV_CSE

c. -876 mV_CSE

d. -1040 mV_CSE

80.

Q: If a sheet pile potential of -1.2 V was measured using SSC, what would the measured potential be if ZRE was used?

a. -144 mV_ZRE.

b. -400 mV_ZRE

c. -0.944 V_ZRE

d. -1.312 V_ZRE

81.

Q: The corrosion rate of iron caused by current discharge is

a. 15 pounds per ampere per year

b. 20 pounds per ampere per year

c. 20 pounds per ampere per month

d. 40 pounds per ampere per year

82.

Q: Which of the following is NOT a source of dynamic stray current?

A. Cathodic protection

B. Mining equipment

C. Transit systems

D. Telluric current

83.

Q: Stray current CAN NOT be detected by

A. structure-to-electrolyte potentials

B. reference electrode to electrode measurements

C. pipeline current span measurements

D. Soil resistivity measurements

84.

Q: Cathodic interference occurs

A. in a voltage gradient that is positive to remote earth

B. in a voltage gradient that is negative to remote earth

C. at the cathode in a corrosion cell

D. at the structure’s cathodic protection system

85.

Q: An electronegative peak in potentials along a cathodically protected pipeline may be indicative of

a. anodic interference

b. cathodic interference

c. shorted road casing

d. current discharge

86.

Q: Analysis of dynamic stray current does NOT typically include the evaluation of

A. soil resistivity

B. the interaction of voltages between different structures

C. measuring of current on the structure

D. correlation of current and voltages on different structures and

87.

Q: With the current (and direction) measured at adjacent spans on a pipeline, which condition indicates a current discharge (Location A is left of Location B

A. Location A= 2.0 A (left) Location B= 1.0A (right)

B. Location A= 2.0 A (right) Location B= 1.0 A (left)

C. Location A= 1.0 A (left) Location B= 1.0 A (left)

D. Location A = 1.0 A (right) Location B= 2.0 A (right)

88.

Q: Recommended methods of mitigating cathodic interference from another cathodic protection system include which of the following?

A. Drainage control bond

B. cathodic protection

C.Coating the current discharge area

D. Reduce the source of stray current

E. A, B, and D

89.

Q: A complete cathodic protection system monitoring program consists of which of the following?

A. Detailed survey only

B. Routine readings between surveys only

C. Detailed survey and routine readings between surveys

D. Soil resistivity surveys

90.

Q: Proper operation of a rectifier can be confirmed by which of the following?

A. DC current output

B. DC voltage output

C. tap setting

D. Potential at a control point

E. all of the above

91.

The Corrosion Cell

Q: In the corrosion cell shown in Figure 2, which of the following occurs at the cathode?
Given:
1. Oxidation
2. Current pick-up
3. Metal loss
4. No metal loss
5. Current Discharge
6. Reduction

a. 1

b. 1 & 3

c. 1, 3 & 5

d. 2 & 4

e. 2, 4 & 6

92.

Q: In the corrosion cell shown in Figure 2, what is the direction of I_CORR?

a. Anode to Cathode through the bond wire

b. Cathode to Anode through the electrolyte

c. Clockwise

d. Counterclockwise

93.

Q: In the corrosion cell shown in Figure 2, which of the following conditions would reduce I_CORR?

a. Increase salt concentration in the electrolyte

b. Decrease bond wire length

c. Increase ambient temperature

d. Decrease oxygen concentration in the electrolyte

94.

Q: A short to the bare structure will most likely cause which of the following?

A. A decrease in the current output of the anode

B. An electropositive change in the pipe-to-electrolyte potential

C. an increase in the current output of the anode

D. An electronegative change in the pipe-to-electrolyte potential

95.

Q: Which of the following regulations require inspection of an interference control drainage bond?

A. DOT 49 CFR 192

B. DOT 49 CFR 195

C. CSA Z662

D. ISO 15589-1

E. All of the above

96.

Q: Reasons for keeping records include which of the following?

A. Legal Defense

B. Government regulations

C. Historical references

D. Possible future ECDA assessment

E. All of the above

97.

Q: Which of the following items must be included in recording structure-to-electrolyte potentials on routine surveys?

A. Value

B. Units

C. Polarity

D. Reference Electrode

E. All of the above

98.

Q: Which of the following is NOT necessary for establishing the integrity of an aging pipeline?

A. Dig inspection data

B. In-line inspection data

C. Electrostatic voltages

D. Leak History

99.

Q: A job safety analysis allows a project to proceed when the

A. hazards have been identified

B. risks have been identified

C. Preventative measures reduce the risk to an acceptable level

D. risk increases

E. A, B, and C only

100.

Q: Which of the following is the maximum current passing through an average-sized body that will allow the muscles to let it go?

A. 4 mA

B. 8 mA

C. 120 mA

D. 480 mA

101.

Q: It is safe to work behind the panel of a rectifier under which of the following conditions?

A. When the rectifier breaker is off

B. When the rectifier breaker is off and locked out

C. When the outside DC cables are disconnected

D. when the outside AC disconnect is off and locked out

102.

Q: A constant AC voltage-to-ground equal to or in excess of which of the following is considered to be hazardous?

A. 5 volts AC

B. 15 Volts AC

C. 24 Volts AC

D. 40 Volts AC

B. 15 VoltsAC

103.

Q: When measuring a structure-to-electrolyte potential, which of the following measurements should be taken first for safety?

A. A soil resistivity measurement

B. The reference electrode contact resistance

C. an AC voltage-to-ground

D. The meter lead resistance

104.

DC Electrical Circuits

Q: What is the total Resistance in the circuit depicted in Figure 1?

a. 0.77 Ω

b. 0.94 Ω

c. 2.80 Ω

d. 1016 Ω

105.

Q: What value of E1 would double the current in R2?

a. 10 V

b. 20 V

c. 30 V

d. 40 V

106.

Q: Hazardous materials include which of the following?

A. Solvents

B. Caustics

C. Acids

D. Copper Sulfate

E. all of the above

107.

Q: Gases that either promote combustion or are flammable can be produced at the

A. anode only

B. protected structure only

C. anode and structure

D. neither the anode or structure

108.

Q: Before working on a project you must know which of the following?

A. The possible hazards

B. Where to go in case of emergency

C. Contact people and telephone information

D. MSDS data for materials handled

E. all of the above

109.

Q: Personal protective equipment in plants includes which of the following?

A. Hard hats

B. Safety shoes or boots

C. Fire retardant coveralls

D. Safety glasses

E. all of the above

Question 1 of 109

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Test Name: AMPP/NACE CP2 – Cathodic Protection Technician – Theory Exam
Test Code: AMPP/NACE-CP2-001

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Cathodic Protection Technician (CP 2) Practical Exam (hands-on)
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Number of Questions: 90
Format: Computer Based Testing (CBT)

What Books Recommended to Study for NACE CP2 TechnicianTest?

Here you can see the best books and Standards to study for NACE CP 2 Cathodic Protection Technician Exam

Peabody, A. W. (2001). Peabody’s Control of Pipeline Corrosion (No. Ed. 2). NACE.
AMPP Cathodic Protection Technician – CP 2 course material
NACE SP 0169 (2013). “Control of External Corrosion on Underground of Submerged Metallic Piping Systems.”
NACE SP 0176 (2007) SG. “Corrosion Control of Submerged Areas of Permanently Installed Steel Offshore Structures Associated with Petroleum Production.”
NACE SP 0177 (2014). “Mitigation of Alternating Current and Lightning Effects on Metallic Structures and Corrosion Control Systems.”
NACE SP 0200 (2014). “Steel-Cased Pipeline Practices.”
NACE SP 0207 (2007). “Performing Close-Interval Potential Surveys and DC Surface Potential Gradient Surveys on Buried or Submerged Metallic Pipelines.”

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Q: How much CP current is required to protect a buried steel storage tank that is 3 m diameter by 6 m long and coated (i.e. 4% bare) in 8,500 Ωꞏcm soil based on a design CP current density of 20 mA/m2 of exposed steel surface area?

Math – Algebra, Geometry, Logic, Unit Conversions Q: What is the weight of a steel rod that is 50 mm in diameter by 3 feet long? Given: 1 inch = 2.54 cm;1 foot = 12 inches, 1 kg = 2.205 lb, 1 cm3 of steel = 8 g

Q: Which of the following are depolarizers?

Q: Polarization occurs

Q: Which of the following factors affect polarization?

Q: Which of the following are types of polarization?

Q: The measure of the electrochemical difference between two metals in an electrolyte is which of the following?

What is the current in a 91 m (300 ft) span of 762 mm (30 in) pipe weighing 176.65 kg/m 118.7 lb/ft), if the voltage drop across that span is 0.62 mV?

Q: The relationship between current and polarization is described by which of the following?

Q: A passivating material will exhibit which of the following properties?

When an ammeter with an internal resistance of 0.15 Ω is inserted into a circuit that is normally operating at 5 V and 20 A, what will the ammeter current read?

Q: In a standard emf series of metals, which of the following is represented?

Q: If two different metals are connected together in an electrolyte, the metal with the

Q: In a practical galvanic series of metals, which of the following is represented?

Q: A corrosion cell can form under which of the following conditions?

Q: When bare metal passes under a paved road surface,

Q: An environment where cathodic protection is NOT effective is

Q: The cathodic protection criteria for steel includes which of the following?

Q: When cathodic protection is applied to a corroding steel surface, it shifts the corrosion cell potential?

Q: Cathodic protection polarizes

Q: The current requirement for cathodic protection of a structure will increase with a

Q: In a galvanic anode system, the driving voltage is due to the

Meter Operation

<img decoding="async" src="https://i.ibb.co/r4QnT3F/Figure-14-Typical-DMM.png" alt="Figure-14-Typical-DMM.png" /> Q: Referring to Figure 14, select the correct configuration to measure the 50mA output current of a galvanic anode with a ‘positive’ meter indication.

<img decoding="async" src="https://i.ibb.co/r4QnT3F/Figure-14-Typical-DMM.png" alt="Figure-14-Typical-DMM.png" />

Q: Referring to Figure 14, select the recommended configuration for pipe-to-soil potential measurements to assess protection.

Q: Which is NOT a primary reaction at the anode?

Q: Which of the following will decrease cathodic protection current requirements?

Q: A galvanic anode system is NOT normally suitable in which of the following conditions?

Q: The purpose of the galvanic anode backfill is NOT to

Q: The elements of a galvanic cathodic protection system in soil include which of the following?

Q: An impressed current system is NOT normally practical under which of the following conditions

Q: Rectifier components could include which of the following?

Q: Which of the following DC power supplies are commonly used to charge batteries that in turn provide cathodic protection current?

Q: A transformer will

Q: If the primary AC voltage is 100 Volts AC, and there are 100 primary windings with 200 secondary windings, what is the secondary voltage?

Shunt Measurements

<img decoding="async" src="https://i.ibb.co/kBrVwYh/Figure-13-Shunt-Measurement.png" alt="Figure-13-Shunt-Measurement.png" /> Q: What is the shunt current magnitude & direction for the measurement shown in Figure 13? Current Direction

Q: What would the meter in Figure 13 display if the shunt current was 40 A from Right-to-Left?

Q: With a single diode installed in series with an AC voltage source the results will be

Q: Full wave rectification can be achieved with

Q: What is the purpose of a “free-wheeling” diode?

Q: The advantage of three-phase rectifiers over single-phase rectifiers is that they

Q: Which DC power supply converts heat energy directly to electrical energy?

Q: A constant potential rectifier provides a constant

Q: What is the pipe-to-earth resistance of a 3 km (1.86 mi) section of 32 cm (12.75 in) diameter pipe that has a 4-wire current span at each end with the following data?

Q: A structure-to-electrolyte potential measures the potential difference between

Q: A close interval potential survey is a test where structure-to-electrolyte potentials are measured

Q: Polarized potentials are measured

Soil Resistivity

Q: Assuming the measurement shown in Figure 9 is from a Wenner 4-Pin arrangement with 1.5 m spacing between pins, what is the corresponding soil resistivity?

Q: Polarization is determined by

Q: Assuming the measurement shown in Figure 11 is for the soil box as shown in Figure 12 having a soil cross-sectional area (A) of 12 cm2 and length (L) of 120mm between the red terminals, what is the corresponding soil resistivity?

Q: What is the current in a 91 m (300 ft) span of 762 mm (30 in) pipe weighing 176.65 kg/m (118.7 lb/ft), if the voltage drop across that span is 0.62 mV?

Q: Structure-to-electrolyte potentials can be used for which of the following purpose(s)?

Q: Which of these would clearly indicate that a tank is isolated?

Q: For steel in concrete what is the probability of corrosion at a potential of -370mVcse?

Q: If current being impressed onto a structure is causing a potential gradient of 50 mv per meter (average_ and the reference electrode is 3 m from the structure, what is the potential being measured if the true potential at the structure is -800 mV?

Q: With proper instrumentation, a dual soil coupon can be used to predict which of the following?

Q: An electrolytic couple between a pipe and a casing

Q: With sufficient current applied to a pipeline that has an electrolytic couple to the casing, the potentials will

Q: A stray current is a current that

Potential Measurements, Criteria, & Isolation

<img decoding="async" src="https://i.ibb.co/FBrJ2Rp/Figure-3-Structure-Polarization-and-Depolarization-due-to-CP-Current.png" alt="Figure-3-Structure-Polarization-and-Depolarization-due-to-CP-Current.png" /> Q: In Figure 3, which potential is used to evaluate the -850 mVcse potential criterion?

Q: In Figure 3, which potential is used to evaluate 100 mV polarization criteria?

Q: Which measured potential below is most likely for new unprotected steel in moist soil?

a. +150 mVcse

b. -358 mVcse

c. -620 mVcse

d. -830 mVcse

<img decoding="async" src="https://i.ibb.co/VVtGBPK/Figure-4-Cased-Crossing.png" alt="Figure-4-Cased-Crossing.png" />

Q: Referring to the cased crossing in Figure 4, if the IR-free polarized potentials of the Pipe & Casing are as shown, which of the following conditions most likely exists?

<img decoding="async" src="https://i.ibb.co/N1MYtzv/Figure-5-Isolating-Flange.png" alt="Figure-5-Isolating-Flange.png" />

Q: Referring to Figure 5, if the indicated potentials are measured while the CP system is on, which of the following conditions is confirmed?

Q: Referring to the TR panel in Figure 7, what is the DMM in Figure 6 most likely measuring?

<img decoding="async" src="https://i.ibb.co/8bCQZb0/Figure-7-Typical-TR-Front-Panel.png" alt="Figure-7-Typical-TR-Front-Panel.png" />

Q: Referring to the TR panel in Figure 7, which most accurately describes component IDs?

Q: Referring to Figure 8, which value will DMM display when connected as shown?

Q: A mitigation control bond should be designed to

Q: A mitigation bond may cause more problems under which of the following conditions?

Math – Algebra, Geometry, Logic, Unit Conversions
Q: What is the weight of a steel rod that is 50 mm in diameter by 3 feet long?
Given: 1 inch = 2.54 cm;1 foot = 12 inches, 1 kg = 2.205 lb, 1 cm³ of steel = 8 g

Q: Referring to Figure 14, select the correct configuration to measure the 50mA output current of a galvanic anode with a ‘positive’ meter indication.

Q: What is the shunt current magnitude & direction for the measurement shown in Figure 13?
Current Direction

Q: Assuming the measurement shown in Figure 11 is for the soil box as shown in Figure 12 having a soil cross-sectional area (A) of 12 cm²and length (L) of 120mm between the red terminals, what is the corresponding soil resistivity?

Q: For steel in concrete what is the probability of corrosion at a potential of -370mV_cse?

Q: In Figure 3, which potential is used to evaluate the -850 mV_cse potential criterion?

a. +150 mV_cse

b. -358 mV_cse

c. -620 mV_cse

d. -830 mV_cse

Given: Potential of Zinc Reference (ZRE) = -1116 mV_CSE

Potential of Silver Chloride Reference (SSC) = -60 mV_CSE

Q: In the corrosion cell shown in Figure 2, what is the direction of I_CORR?

Q: In the corrosion cell shown in Figure 2, which of the following conditions would reduce I_CORR?

DC Electrical Circuits

Q: What is the total Resistance in the circuit depicted in Figure 1?