Take A Free AMPP/NACE CP3 Theory Exam Practice Test – Quiz Course

1.

Chapter 1. Mechanisms of Corrosion:

Which of the following factors would lead to a decrease in the rate of oxidation reactions at the anode during corrosion processes?

2.

In the context of corrosion, which of the following reactions represents the oxidation process of iron in an aqueous environment?

3.

Which of the following factors contributes to an increase in resistance within a corrosion cell, thereby affecting the overall corrosion rate?

4.

In a corrosion cell, electrons flow in the direction of:

5.

What is the primary product formed during the corrosion to passive transition of iron in the presence of water?

6.

What technique is best used to assess the protective coating quality of the pipeline?

7.

In the example provided, what is the calculated Pipe Coating Conductance S?

8.

Using the data provided, what is the total current required to achieve a minimum polarized pipe potential of −0.900 Volts/CSE?

9.

Using the information provided, rate the quality of the coating.

10.

What is the primary factor that drives corrosion in a metal?

11.

The Pourbaix Diagram is primarily used to predict:

12.

In the Electromotive Force Series, metals are arranged based on their:

13.

Which of the following factors is NOT included in the Nernst equation?

14.

What is the most commonly used reference electrode in corrosion measurements?

15.

How does increasing temperature generally affect the potential of a reference electrode?

16.

What must be known to convert a measured potential between two different reference electrodes?

17.

Which of the following is NOT a component of a corrosion cell?

18.

Polarization in a corrosion cell is the result of:

19.

Faraday’s Law relates the amount of material lost in corrosion to the:

20.

If the potential of -700 mVCSE is measured with the reference at 25°C, what is the measured potential if the reference is at 40°C?

21.

Which of the following conditions will increase galvanic anode polarization?

22.

How long during this 30-day period has the rectifier been OFF given the following data?
• DC output 15 Vdc and 10Adc
• 4 rev per minute on a KWH meter where K = 1
• AC power consumption for the 30-day period is 120 KWH

23.

Which one of the following would result in the largest corrosion rate according to Faraday’s Law?

24.

Chapter 2: Cathodic Protection Systems
What is the primary function of cathodic protection?

25.

The -850 mVCSE criterion refers to a potential measured relative to which reference electrode?

26.

The 100 mV polarization shift criterion requires that the structure’s potential shift at least 100 mV after:

27.

Which of the following does NOT affect the validity of cathodic protection criteria?

28.

The cathodic polarization curve shows the relationship between polarization and:

29.

Activation polarization refers to the:

30.

Concentration polarization is caused by:

31.

Which of the following factors affects cathodic polarization?

32.

Which of the following is a common material used for galvanic anodes in cathodic protection systems?

33.

Impressed current anodes require an external power source because:

34.

Chapter 3: Interference
What is interference in the context of cathodic protection systems?

35.

Stray currents are most commonly detected by measuring:

36.

Stray currents cause corrosion at:

37.

One of the most common ways to mitigate stray current interference from an impressed current cathodic protection system is to:

38.

Stray current can originate from sources other than cathodic protection systems, including:

39.

AC interference refers to interference caused by:

40.

Conductive coupling in AC interference typically occurs due to:

41.

Electrostatic (capacitive) coupling is the result of:

42.

Electromagnetic (inductive) coupling is caused by:

43.

Electromagnetic interference on a metallic structure can be detected by measuring:

44.

CP3-Chapter 4- CP Design Fundamentals
Q:- The resistance of a pipe, calculated using Equation 4-30 and 4-31.

45.

An anode positioned horizontally below ground level.

46.

The minimum weight of anode material required, calculated using Equation 4-33 or 4-34.

47.

An anode positioned vertically in the ground at ground level.

48.

An equation used to calculate the resistance of an anode in soil.

49.

An anode with a considerable depth below ground level, where the depth is much larger than the length of the anode.

50.

The amount of cathodic protection current required multiplied by the anticipated service life of the system.

51.

The resistance of a 1 km length of pipe with a diameter of 20 in. and a schedule of 30, calculated using Equation 4-30 and 4-31.

52.

The theoretical rate at which anode material is consumed.

53.

The efficiency of an anode in converting electrical energy into chemical energy.

54.

The theoretical capacity of anode material.

55.

The resistance of a vertical anode to the surrounding earth, calculated using Equation 4-19.

56.

A factor that accounts for the efficiency of an anode as it is consumed.

57.

The resistance of multiple horizontal anodes placed close together and surrounded by continuous coke, calculated using Equation 4-23.

58.

The conductance of a ring-shaped material, dependent on its conductivity and resistivity.

59.

The resistance of an anode with a length of 6 ft and a diameter of 2 in. in soil with a resistivity of 10,000 Ω-cm, calculated using Dwight’s equation.

60.

An anode that is located well below ground level, with the depth to the top of the anode or coke column being about the same order of magnitude as the length of the anode or coke column.

61.

The resistance for direct current, which is lower than the resistance for alternating current due to skin effects.

62.

An anode with a shallow depth below ground level, where the depth is much smaller than the length of the anode and the diameter of the anode.

63.

The resistance of a single vertical rod, calculated using Equation 4-24.

64.

Chapter 5: Evaluation of CP System Performance
The primary purpose of evaluating a cathodic protection (CP) system’s performance is to:

65.

The most common method for evaluating cathodic protection effectiveness is through:

66.

The copper-copper sulfate reference electrode is primarily used in:

67.

Buried reference electrodes are used to:

68.

When performing potential measurements, why is polarity important?

69.

Errors in the potential measurement circuit can occur due to:

70.

A common cause of voltage drop errors in potential measurements is:

71.

Voltage drop errors due to current in the pipeline are typically caused by:

72.

Which of the following methods is commonly used to minimize voltage drop errors in potential measurements?

73.

The current interruption method involves: