PTPR 6006_Corrosion Mechanisms

Question 1:

A cathode:

A - Is the terminal of an electrolytic cell at which oxidation occurs
B - Is where electrons flow away from in the external circuit
C - Is where cations accept electrons thus being reduced
D - Is usually where corrosion occurs as the metal ions enter the electrolyte

Correctness Rule: Single Correct Answer Required

Answer(s) Given: C
Correct Answer(s): C
Marked as: Correct

_______________________________________________

Question 2:

Galvanic corrosion can occur in a pipe system where all the pipes are made of the same material because:

A - Pairs of cathodes and anodes cannot exist along the surface of a single piece of metal
B - Rough surfaces and microscopic imperfections will produce differences in electrical potential
C - Small pockets of carbon from the steel making process cause parts of the steel to become more noble
D - All of the above

Correctness Rule: Single Correct Answer Required

Answer(s) Given: B
Correct Answer(s): B
Marked as: Correct

_______________________________________________

Question 3:

Although the mechanism for sulphide cracking is not completely understood, it is agreed that one of the following conditions must be present before the problem can occur:

A - Hydrogen sulphide must be present
B - The steel must be completely stress-free
C - Low strength steel must be involved
D - There must be a total absence of water

Correctness Rule: Single Correct Answer Required

Answer(s) Given: A
Correct Answer(s): A
Marked as: Correct

_______________________________________________

Question 4:

A reaction in which there is an increase in valence of an atom resulting from a loss of electrons is defined as:

A - Polarization
B - Oxidation
C - Potential
D - Reduction

Correctness Rule: Single Correct Answer Required

Answer(s) Given: B
Correct Answer(s): B
Marked as: Correct

_______________________________________________

Question 5:

The type of corrosion where an increase in the concentration of hydrogen at the surface of steel causing the hydrogen atoms to diffuse into the steel resulting in a severe loss of ductility is called:

A - Hydrogen embrittlement
B - Hydrogen blistering
C - Sulphide stress cracking
D - Caustic embrittlement

Correctness Rule: Single Correct Answer Required

Answer(s) Given: A
Correct Answer(s): A
Marked as: Correct

_______________________________________________

Question 6:

Galvanic corrosion occurs when a metal is electrically connected to another metal in the same electrolyte. The rate of galvanic corrosion depends upon the nature of the environment in which the metals exist as well as the:

A - Potential difference between the metals
B - Polarization behaviour of the metals
C - Distance between the dissimilar metals
D - All of the above

Correctness Rule: Single Correct Answer Required

Answer(s) Given: D
Correct Answer(s): D
Marked as: Correct

_______________________________________________

Question 7:

All of the following are important types of corrosion failure mechanisms associated with waterside boiler corrosion except:

A - Caustic corrosion
B - Hydrogen damage
C - Pitting
D - Sulphate reducing bacteria

Correctness Rule: Single Correct Answer Required

Answer(s) Given: D
Correct Answer(s): D
Marked as: Correct

_______________________________________________

Question 8:

The type of bacteria that require oxygen to live and grow are referred to as:

A - Aerobic bacteria
B - Anaerobic bacteria
C - Facultative bacteria
D - None of the above

Correctness Rule: Single Correct Answer Required

Answer(s) Given: A
Correct Answer(s): A
Marked as: Correct

_______________________________________________

Question 9:

When biological corrosion occurs in an environment that is totally lacking in oxygen and high in sulphates, the most likely type of bacterial source of the corrosion is:

A - Salmonella bacteria
B - Anaerobic bacteria
C - Facultative bacteria
D - Aerobic bacteria

Correctness Rule: Single Correct Answer Required

Answer(s) Given: B
Correct Answer(s): B
Marked as: Correct

_______________________________________________

Question 10:

Dry atmospheric corrosion occurs when metals have the ability to form a stable film in the presence of:

A - Carbon dioxide
B - Oxygen
C - Hydrogen
D - Nitrogen

Correctness Rule: Single Correct Answer Required

Answer(s) Given: B
Correct Answer(s): B
Marked as: Correct

Question 1:

For sulphide stress cracking to occur, hydrogen sulphide must be present, high-strength steel that is under tensile stress must be involved, and:

A - Sulphide reducing bacteria must be present
B - Water must be present
C - The process must involve chlorine
D - Water must be absent

Correctness Rule: Single Correct Answer Required

Answer(s) Given: B
Correct Answer(s): B
Marked as: Correct

_______________________________________________

Question 2:

Sulphate reducing bacteria (SRB) are very corrosive in an:

A - Oxygenated environment
B - Anaerobic environment
C - Aqueous environment
D - Aerobic environment

Correctness Rule: Single Correct Answer Required

Answer(s) Given: B
Correct Answer(s): B
Marked as: Correct

_______________________________________________

Question 3:

Although the mechanism for sulphide cracking is not completely understood, it is agreed that one of the following conditions must be present before the problem can occur:

A - There must be a total absence of water
B - Hydrogen sulphide must be present
C - The steel must be completely stress-free
D - Low strength steel must be involved

Correctness Rule: Single Correct Answer Required

Answer(s) Given: B
Correct Answer(s): B
Marked as: Correct

_______________________________________________

Question 4:

When biological corrosion occurs in an environment that is totally lacking in oxygen and high in sulphates, the most likely type of bacterial source of the corrosion is:

A - Anaerobic bacteria
B - Salmonella bacteria
C - Facultative bacteria
D - Aerobic bacteria

Correctness Rule: Single Correct Answer Required

Answer(s) Given: A
Correct Answer(s): A
Marked as: Correct

_______________________________________________

Question 5:

Stray current corrosion differs from galvanic corrosion because stray current corrosion is caused by:

A - An internal source of current
B - An external source of current
C - An impressed-current cathodic protection system
D - The voltage produced in the corrosion cell itself

Correctness Rule: Single Correct Answer Required

Answer(s) Given: B
Correct Answer(s): B
Marked as: Correct

_______________________________________________

Question 6:

A cathode:

A - Is where cations accept electrons thus being reduced
B - Is where electrons flow away from in the external circuit
C - Is the terminal of an electrolytic cell at which oxidation occurs
D - Is usually where corrosion occurs as the metal ions enter the electrolyte

Correctness Rule: Single Correct Answer Required

Answer(s) Given: A
Correct Answer(s): A
Marked as: Correct

_______________________________________________

Question 7:

The type of bacteria that require oxygen to live and grow are referred to as:

A - Aerobic bacteria
B - Anaerobic bacteria
C - Facultative bacteria
D - None of the above

Correctness Rule: Single Correct Answer Required

Answer(s) Given: A
Correct Answer(s): A
Marked as: Correct

_______________________________________________

Question 8:

Although there are a number of environmental conditions that contribute to stress corrosion cracking, what must first exist for this condition to begin?

A - A high copper-sulphate concentration must exist in the process fluid
B - There must be a flaw or discontinuity in the metal
C - Boiler water must be raised to a pH of between 9 and 11.5
D - There must be multiple layers of moisture

Correctness Rule: Single Correct Answer Required

Answer(s) Given: B
Correct Answer(s): B
Marked as: Correct

_______________________________________________

Question 9:

A reaction in which there is a decrease in valence of an atom resulting from the gain of electrons is defined as:

A - Potential
B - Polarization
C - Reduction
D - Oxidation

Correctness Rule: Single Correct Answer Required

Answer(s) Given: C
Correct Answer(s): C
Marked as: Correct

_______________________________________________

Question 10:

The type of corrosion where an increase in the concentration of hydrogen at the surface of steel causing the hydrogen atoms to diffuse into the steel resulting in a severe loss of ductility is called:

A - Hydrogen blistering
B - Hydrogen embrittlement
C - Caustic embrittlement
D - Sulphide stress cracking

Correctness Rule: Single Correct Answer Required

Answer(s) Given: B
Correct Answer(s): B
Marked as: Correct

Question 1:

Stray current corrosion differs from galvanic corrosion because stray current corrosion is caused by:

A - An internal source of current
B - An impressed-current cathodic protection system
C - An external source of current
D - The voltage produced in the corrosion cell itself

Correctness Rule: Single Correct Answer Required

Answer(s) Given: C
Correct Answer(s): C
Marked as: Correct

_______________________________________________

Question 2:

Waterside corrosion in boilers can be a serious problem that can cause unscheduled shut downs of steam generators. In order to prevent this a boiler must be carefully monitored so that it maintains a magnetite coating that will help to prevent corrosions. What is the most important requirement to maintaining that coating?

A - Keeping the pH of the boiler water at 7
B - Keeping the pH of the boiler water at 11
C - Keeping the boiler water temperature above 90 degrees C
D - Replacing the boiler water every 30 days

Correctness Rule: Single Correct Answer Required

Answer(s) Given: B
Correct Answer(s): B
Marked as: Correct

_______________________________________________

Question 3:

When biological corrosion occurs in an environment that is totally lacking in oxygen and high in sulphates, the most likely type of bacterial source of the corrosion is:

A - Facultative bacteria
B - Anaerobic bacteria
C - Aerobic bacteria
D - Salmonella bacteria

Correctness Rule: Single Correct Answer Required

Answer(s) Given: B
Correct Answer(s): B
Marked as: Correct

_______________________________________________

Question 4:

In hydrogen stress cracking, the atoms of hydrogen interact with the metal to induce crack growth, which may lead to fracture. This cracking is in the absence of active corrosion. If there were active corrosion, the cracking would more correctly be termed:

A - Hydrogen blistering
B - Galvanic corrosion
C - Stress corrosion cracking
D - Hydrogen embrittlement

Correctness Rule: Single Correct Answer Required

Answer(s) Given: C
Correct Answer(s): C
Marked as: Correct

_______________________________________________

Question 5:

Galvanic corrosion occurs when a metal is electrically connected to another metal in the same electrolyte. The rate of galvanic corrosion depends upon the nature of the environment in which the metals exist as well as the:

A - Potential difference between the metals
B - Polarization behaviour of the metals
C - Distance between the dissimilar metals
D - All of the above

Correctness Rule: Single Correct Answer Required

Answer(s) Given: D
Correct Answer(s): D
Marked as: Correct

_______________________________________________

Question 6:

Galvanic corrosion can occur in a pipe system where all the pipes are made of the same material because:

A - Pairs of cathodes and anodes cannot exist along the surface of a single piece of metal
B - Rough surfaces and microscopic imperfections will produce differences in electrical potential
C - Small pockets of carbon from the steel making process cause parts of the steel to become more noble
D - All of the above

Correctness Rule: Single Correct Answer Required

Answer(s) Given: B
Correct Answer(s): B
Marked as: Correct

_______________________________________________

Question 7:

An anode:

A - Is where electrons flow toward in the external circuit
B - Is the terminal of an electrolytic cell at which reduction occurs
C - Is where cations accept electrons thus being reduced
D - Is usually where corrosion occurs, as the metal ions enter the electrolyte

Correctness Rule: Single Correct Answer Required

Answer(s) Given: D
Correct Answer(s): D
Marked as: Correct

_______________________________________________

Question 8:

Sulphate reducing bacteria (SRB) are very corrosive in an:

A - Aqueous environment
B - Anaerobic environment
C - Aerobic environment
D - Oxygenated environment

Correctness Rule: Single Correct Answer Required

Answer(s) Given: B
Correct Answer(s): B
Marked as: Correct

_______________________________________________

Question 9:

The most destructive source of stray current corrosion is:

A - Direct current
B - 110 volt current
C - 220 volt current
D - Alternating current

Correctness Rule: Single Correct Answer Required

Answer(s) Given: A
Correct Answer(s): A
Marked as: Correct

_______________________________________________

Question 10:

A reaction in which there is an increase in valence of an atom resulting from a loss of electrons is defined as:

A - Polarization
B - Potential
C - Oxidation
D - Reduction

Correctness Rule: Single Correct Answer Required

Answer(s) Given: C
Correct Answer(s): C
Marked as: Correct

Question 1:

Waterside corrosion in boilers can be a serious problem that can cause unscheduled shut downs of steam generators. In order to prevent this a boiler must be carefully monitored so that it maintains a magnetite coating that will help to prevent corrosions. What is the most important requirement to maintaining that coating?

A - Keeping the boiler water temperature above 90 degrees C
B - Keeping the pH of the boiler water at 7
C - Replacing the boiler water every 30 days
D - Keeping the pH of the boiler water at 11

Correctness Rule: Single Correct Answer Required

Answer(s) Given: D
Correct Answer(s): D
Marked as: Correct

_______________________________________________

Question 2:

In hydrogen stress cracking, the atoms of hydrogen interact with the metal to induce crack growth, which may lead to fracture. This cracking is in the absence of active corrosion. If there were active corrosion, the cracking would more correctly be termed:

A - Hydrogen embrittlement
B - Hydrogen blistering
C - Galvanic corrosion
D - Stress corrosion cracking

Correctness Rule: Single Correct Answer Required

Answer(s) Given: D
Correct Answer(s): D
Marked as: Correct

_______________________________________________

Question 3:

The type of bacteria that require oxygen to live and grow are referred to as:

A - Aerobic bacteria
B - Anaerobic bacteria
C - Facultative bacteria
D - None of the above

Correctness Rule: Single Correct Answer Required

Answer(s) Given: A
Correct Answer(s): A
Marked as: Correct

_______________________________________________

Question 4:

An anode:

A - Is usually where corrosion occurs, as the metal ions enter the electrolyte
B - Is where electrons flow toward in the external circuit
C - Is where cations accept electrons thus being reduced
D - Is the terminal of an electrolytic cell at which reduction occurs

Correctness Rule: Single Correct Answer Required

Answer(s) Given: A
Correct Answer(s): A
Marked as: Correct

_______________________________________________

Question 5:

Stray current corrosion differs from galvanic corrosion because stray current corrosion is caused by:

A - An impressed-current cathodic protection system
B - An external source of current
C - The voltage produced in the corrosion cell itself
D - An internal source of current

Correctness Rule: Single Correct Answer Required

Answer(s) Given: B
Correct Answer(s): B
Marked as: Correct

_______________________________________________

Question 6:

For sulphide stress cracking to occur, hydrogen sulphide must be present, high-strength steel that is under tensile stress must be involved, and:

A - Sulphide reducing bacteria must be present
B - Water must be present
C - Water must be absent
D - The process must involve chlorine

Correctness Rule: Single Correct Answer Required

Answer(s) Given: B
Correct Answer(s): B
Marked as: Correct

_______________________________________________

Question 7:

A cathode:

A - Is usually where corrosion occurs as the metal ions enter the electrolyte
B - Is the terminal of an electrolytic cell at which oxidation occurs
C - Is where electrons flow away from in the external circuit
D - Is where cations accept electrons thus being reduced

Correctness Rule: Single Correct Answer Required

Answer(s) Given: D
Correct Answer(s): D
Marked as: Correct

_______________________________________________

Question 8:

All of the following are important types of corrosion failure mechanisms associated with waterside boiler corrosion except:

A - Caustic corrosion
B - Sulphate reducing bacteria
C - Hydrogen damage
D - Pitting

Correctness Rule: Single Correct Answer Required

Answer(s) Given: B
Correct Answer(s): B
Marked as: Correct

_______________________________________________

Question 9:

Dry atmospheric corrosion occurs when metals have the ability to form a stable film in the presence of:

A - Oxygen
B - Hydrogen
C - Nitrogen
D - Carbon dioxide

Correctness Rule: Single Correct Answer Required

Answer(s) Given: A
Correct Answer(s): A
Marked as: Correct

_______________________________________________

Question 10:

Galvanic corrosion can occur in a pipe system where all the pipes are made of the same material because:

A - Pairs of cathodes and anodes cannot exist along the surface of a single piece of metal
B - Rough surfaces and microscopic imperfections will produce differences in electrical potential
C - Small pockets of carbon from the steel making process cause parts of the steel to become more noble
D - All of the above

Correctness Rule: Single Correct Answer Required

Answer(s) Given: B
Correct Answer(s): B
Marked as: Correct

Question 1:

In hydrogen stress cracking, the atoms of hydrogen interact with the metal to induce crack growth, which may lead to fracture. This cracking is in the absence of active corrosion. If there were active corrosion, the cracking would more correctly be termed:

A - Stress corrosion cracking
B - Hydrogen blistering
C - Hydrogen embrittlement
D - Galvanic corrosion

Correctness Rule: Single Correct Answer Required

Answer(s) Given: A
Correct Answer(s): A
Marked as: Correct

_______________________________________________

Question 2:

Galvanic corrosion can occur in a pipe system where all the pipes are made of the same material because:

A - Pairs of cathodes and anodes cannot exist along the surface of a single piece of metal
B - Rough surfaces and microscopic imperfections will produce differences in electrical potential
C - Small pockets of carbon from the steel making process cause parts of the steel to become more noble
D - All of the above

Correctness Rule: Single Correct Answer Required

Answer(s) Given: B
Correct Answer(s): B
Marked as: Correct

_______________________________________________

Question 3:

An anode:

A - Is where electrons flow toward in the external circuit
B - Is where cations accept electrons thus being reduced
C - Is the terminal of an electrolytic cell at which reduction occurs
D - Is usually where corrosion occurs, as the metal ions enter the electrolyte

Correctness Rule: Single Correct Answer Required

Answer(s) Given: D
Correct Answer(s): D
Marked as: Correct

_______________________________________________

Question 4:

Sulphate reducing bacteria (SRB) are very corrosive in an:

A - Oxygenated environment
B - Aqueous environment
C - Aerobic environment
D - Anaerobic environment

Correctness Rule: Single Correct Answer Required

Answer(s) Given: D
Correct Answer(s): D
Marked as: Correct

_______________________________________________

Question 5:

All of the following are important types of corrosion failure mechanisms associated with waterside boiler corrosion except:

A - Sulphate reducing bacteria
B - Hydrogen damage
C - Caustic corrosion
D - Pitting

Correctness Rule: Single Correct Answer Required

Answer(s) Given: A
Correct Answer(s): A
Marked as: Correct

_______________________________________________

Question 6:

A cathode:

A - Is where electrons flow away from in the external circuit
B - Is usually where corrosion occurs as the metal ions enter the electrolyte
C - Is where cations accept electrons thus being reduced
D - Is the terminal of an electrolytic cell at which oxidation occurs

Correctness Rule: Single Correct Answer Required

Answer(s) Given: D
Correct Answer(s): C
Marked as: Incorrect

_______________________________________________

Question 7:

Although the mechanism for sulphide cracking is not completely understood, it is agreed that one of the following conditions must be present before the problem can occur:

A - There must be a total absence of water
B - Low strength steel must be involved
C - Hydrogen sulphide must be present
D - The steel must be completely stress-free

Correctness Rule: Single Correct Answer Required

Answer(s) Given: C
Correct Answer(s): C
Marked as: Correct

_______________________________________________

Question 8:

For sulphide stress cracking to occur, hydrogen sulphide must be present, high-strength steel that is under tensile stress must be involved, and:

A - Water must be present
B - The process must involve chlorine
C - Water must be absent
D - Sulphide reducing bacteria must be present

Correctness Rule: Single Correct Answer Required

Answer(s) Given: A
Correct Answer(s): A
Marked as: Correct

_______________________________________________

Question 9:

When biological corrosion occurs in an environment that is totally lacking in oxygen and high in sulphates, the most likely type of bacterial source of the corrosion is:

A - Facultative bacteria
B - Salmonella bacteria
C - Anaerobic bacteria
D - Aerobic bacteria

Correctness Rule: Single Correct Answer Required

Answer(s) Given: C
Correct Answer(s): C
Marked as: Correct

_______________________________________________

Question 10:

The type of corrosion where an increase in the concentration of hydrogen at the surface of steel causing the hydrogen atoms to diffuse into the steel resulting in a severe loss of ductility is called:

A - Caustic embrittlement
B - Hydrogen embrittlement
C - Hydrogen blistering
D - Sulphide stress cracking

Correctness Rule: Single Correct Answer Required

Answer(s) Given: B
Correct Answer(s): B
Marked as: Correct

Question 1:

Although there are a number of environmental conditions that contribute to stress corrosion cracking, what must first exist for this condition to begin?

A - There must be multiple layers of moisture
B - There must be a flaw or discontinuity in the metal
C - Boiler water must be raised to a pH of between 9 and 11.5
D - A high copper-sulphate concentration must exist in the process fluid

Correctness Rule: Single Correct Answer Required

Answer(s) Given: B
Correct Answer(s): B
Marked as: Correct

_______________________________________________

Question 2:

Sulphate reducing bacteria (SRB) are very corrosive in an:

A - Aerobic environment
B - Oxygenated environment
C - Aqueous environment
D - Anaerobic environment

Correctness Rule: Single Correct Answer Required

Answer(s) Given: D
Correct Answer(s): D
Marked as: Correct

_______________________________________________

Question 3:

A reaction in which there is an increase in valence of an atom resulting from a loss of electrons is defined as:

A - Oxidation
B - Potential
C - Polarization
D - Reduction

Correctness Rule: Single Correct Answer Required

Answer(s) Given: A
Correct Answer(s): A
Marked as: Correct

_______________________________________________

Question 4:

For sulphide stress cracking to occur, hydrogen sulphide must be present, high-strength steel that is under tensile stress must be involved, and:

A - The process must involve chlorine
B - Water must be absent
C - Sulphide reducing bacteria must be present
D - Water must be present

Correctness Rule: Single Correct Answer Required

Answer(s) Given: D
Correct Answer(s): D
Marked as: Correct

_______________________________________________

Question 5:

The type of corrosion where an increase in the concentration of hydrogen at the surface of steel causing the hydrogen atoms to diffuse into the steel resulting in a severe loss of ductility is called:

A - Hydrogen embrittlement
B - Sulphide stress cracking
C - Caustic embrittlement
D - Hydrogen blistering

Correctness Rule: Single Correct Answer Required

Answer(s) Given: A
Correct Answer(s): A
Marked as: Correct

_______________________________________________

Question 6:

The most destructive source of stray current corrosion is:

A - Direct current
B - 110 volt current
C - Alternating current
D - 220 volt current

Correctness Rule: Single Correct Answer Required

Answer(s) Given: A
Correct Answer(s): A
Marked as: Correct

_______________________________________________

Question 7:

In hydrogen stress cracking, the atoms of hydrogen interact with the metal to induce crack growth, which may lead to fracture. This cracking is in the absence of active corrosion. If there were active corrosion, the cracking would more correctly be termed:

A - Hydrogen blistering
B - Galvanic corrosion
C - Stress corrosion cracking
D - Hydrogen embrittlement

Correctness Rule: Single Correct Answer Required

Answer(s) Given: C
Correct Answer(s): C
Marked as: Correct

_______________________________________________

Question 8:

Galvanic corrosion occurs when a metal is electrically connected to another metal in the same electrolyte. The rate of galvanic corrosion depends upon the nature of the environment in which the metals exist as well as the:

A - Potential difference between the metals
B - Polarization behaviour of the metals
C - Distance between the dissimilar metals
D - All of the above

Correctness Rule: Single Correct Answer Required

Answer(s) Given: D
Correct Answer(s): D
Marked as: Correct

_______________________________________________

Question 9:

All of the following are important types of corrosion failure mechanisms associated with waterside boiler corrosion except:

A - Hydrogen damage
B - Sulphate reducing bacteria
C - Caustic corrosion
D - Pitting

Correctness Rule: Single Correct Answer Required

Answer(s) Given: B
Correct Answer(s): B
Marked as: Correct

_______________________________________________

Question 10:

A reaction in which there is a decrease in valence of an atom resulting from the gain of electrons is defined as:

A - Polarization
B - Reduction
C - Oxidation
D - Potential

Correctness Rule: Single Correct Answer Required

Answer(s) Given: B
Correct Answer(s): B
Marked as: Correct

Question 1:

The type of corrosion where an increase in the concentration of hydrogen at the surface of steel causing the hydrogen atoms to diffuse into the steel resulting in a severe loss of ductility is called:

A - Sulphide stress cracking
B - Hydrogen blistering
C - Caustic embrittlement
D - Hydrogen embrittlement

Correctness Rule: Single Correct Answer Required

Answer(s) Given: D
Correct Answer(s): D
Marked as: Correct

_______________________________________________

Question 2:

Stress corrosion cracking is the cracking of a metal that requires the simultaneous action of:

A - A corroding substance and an applied or residual tensile stress
B - A non-corrosive substance and an applied or residual tensile stress
C - A DC current and an applied or residual tensile stress
D - An anaerobic environment and an applied or residual tensile stress

Correctness Rule: Single Correct Answer Required

Answer(s) Given: A
Correct Answer(s): A
Marked as: Correct

_______________________________________________

Question 3:

Although the mechanism for sulphide cracking is not completely understood, it is agreed that one of the following conditions must be present before the problem can occur:

A - Hydrogen sulphide must be present
B - The steel must be completely stress-free
C - Low strength steel must be involved
D - There must be a total absence of water

Correctness Rule: Single Correct Answer Required

Answer(s) Given: A
Correct Answer(s): A
Marked as: Correct

_______________________________________________

Question 4:

The factors affecting the rate of chloride stress corrosion cracking include:

A - Stress level of the metal
B - Temperature to which the metal is exposed
C - Oxygen content of the solution
D - All of the above

Correctness Rule: Single Correct Answer Required

Answer(s) Given: D
Correct Answer(s): D
Marked as: Correct

_______________________________________________

Question 5:

The type of bacteria that require oxygen to live and grow are referred to as:

A - Aerobic bacteria
B - Anaerobic bacteria
C - Facultative bacteria
D - None of the above

Correctness Rule: Single Correct Answer Required

Answer(s) Given: A
Correct Answer(s): A
Marked as: Correct

_______________________________________________

Question 6:

The most destructive source of stray current corrosion is:

A - Direct current
B - 220 volt current
C - Alternating current
D - 110 volt current

Correctness Rule: Single Correct Answer Required

Answer(s) Given: A
Correct Answer(s): A
Marked as: Correct

_______________________________________________

Question 7:

Dry atmospheric corrosion occurs when metals have the ability to form a stable film in the presence of:

A - Carbon dioxide
B - Hydrogen
C - Oxygen
D - Nitrogen

Correctness Rule: Single Correct Answer Required

Answer(s) Given: C
Correct Answer(s): C
Marked as: Correct

_______________________________________________

Question 8:

In hydrogen stress cracking, the atoms of hydrogen interact with the metal to induce crack growth, which may lead to fracture. This cracking is in the absence of active corrosion. If there were active corrosion, the cracking would more correctly be termed:

A - Galvanic corrosion
B - Hydrogen blistering
C - Hydrogen embrittlement
D - Stress corrosion cracking

Correctness Rule: Single Correct Answer Required

Answer(s) Given: D
Correct Answer(s): D
Marked as: Correct

_______________________________________________

Question 9:

When biological corrosion occurs in an environment that is totally lacking in oxygen and high in sulphates, the most likely type of bacterial source of the corrosion is:

A - Anaerobic bacteria
B - Facultative bacteria
C - Aerobic bacteria
D - Salmonella bacteria

Correctness Rule: Single Correct Answer Required

Answer(s) Given: A
Correct Answer(s): A
Marked as: Correct

_______________________________________________

Question 10:

Although there are a number of environmental conditions that contribute to stress corrosion cracking, what must first exist for this condition to begin?

A - Boiler water must be raised to a pH of between 9 and 11.5
B - There must be a flaw or discontinuity in the metal
C - There must be multiple layers of moisture
D - A high copper-sulphate concentration must exist in the process fluid

Correctness Rule: Single Correct Answer Required

Answer(s) Given: B
Correct Answer(s): B
Marked as: Correct

Question 1:

Gas systems have no electrolyte to carry current. The type of instrument used to measure corrosion from stack gases is called a:

A - Linear polarization meter
B - Palladium foil hydrogen patch probe
C - Galvanic probe
D - Resistance probe

Correctness Rule: Single Correct Answer Required

Answer(s) Given: D
Correct Answer(s): D
Marked as: Correct

_______________________________________________

Question 2:

Because a resistance probe requires no ______________ to carry current, it can be used in ___________ systems to measure corrosion from stack gases.

A - electrolyte, liquid
B - wiring, gas
C - wiring, liquid
D - electrolyte, gas

Correctness Rule: Single Correct Answer Required

Answer(s) Given: D
Correct Answer(s): D
Marked as: Correct

_______________________________________________

Question 3:

Fluorescent dye penetrant will indicate cracks under:

A - Visible light
B - Infrared light
C - Ultraviolet light
D - Gamma rays

Correctness Rule: Single Correct Answer Required

Answer(s) Given: C
Correct Answer(s): C
Marked as: Correct

_______________________________________________

Question 4:

The depth of corrosion pits is measured with a:

A - Micrometer
B - Planimeter
C - Galvanometer
D - Vernier caliper

Correctness Rule: Single Correct Answer Required

Answer(s) Given: A
Correct Answer(s): A
Marked as: Correct

_______________________________________________

Question 5:

A steel coupon is installed in a corrosive system and left for 45 days. The coupon is rod shaped, 100 mm long and 5 mm in diameter. Over the 45-day period, it lost a total of 0.6754 g. The density of steel is 7.861 g/mL. The corrosion rate of the coupon is:

Corrosion rate (mm/year) =

A - .043 mm/year
B - 4.324 mm/year
C - 43.24 mm/year
D - 0.432 mm/year

Correctness Rule: Single Correct Answer Required

Answer(s) Given: D
Correct Answer(s): D
Marked as: Correct

_______________________________________________

Question 6:

Electrical resistance probes work on the principle that:

A - As the area of a conductor increases, its resistance increases.
B - As the area of a conductor decreases, its resistance decreases.
C - As the area of a conductor decreases, its resistance increases.
D - None of the above

Correctness Rule: Single Correct Answer Required

Answer(s) Given: C
Correct Answer(s): C
Marked as: Correct

_______________________________________________

Question 7:

When using radiography as an inspection tool, X-rays or gamma rays are used. The amount of radiation that passes through a metal in a given length of time is:

A - Inversely proportional to its thickness
B - Influenced by the magnetic lines of force
C - Directly proportional to its thickness
D - Not affected by its thickness

Correctness Rule: Single Correct Answer Required

Answer(s) Given: A
Correct Answer(s): A
Marked as: Correct

_______________________________________________

Question 8:

The instrument that is best suited for taking readings of the corrosion rate occurring on a coupon or electrode at the moment the measurement is taken is a:

A - Non-linear polarization meter
B - Cross-sectional conductor
C - Galvanic probe assembly
D - Linear polarization meter

Correctness Rule: Single Correct Answer Required

Answer(s) Given: D
Correct Answer(s): D
Marked as: Correct

_______________________________________________

Question 9:

The term used to describe what is happening when thin layers slough off from the metal surface is:

A - Shallow metal attack
B - Blistering or scaling
C - Definite surface corrosion
D - Pitting or grooving

Correctness Rule: Single Correct Answer Required

Answer(s) Given: B
Correct Answer(s): B
Marked as: Correct

_______________________________________________

Question 10:

Which of the following corrosion detecting methods uses a low viscosity, low surface tension liquid to detect cracks that extend to the surface of a metal?

A - Magnetic particle inspection
B - Radiography
C - Dye penetrant inspection
D - Ultrasonic inspection

Correctness Rule: Single Correct Answer Required

Answer(s) Given: C
Correct Answer(s): C
Marked as: Correct

Question 1:

The linear polarization meters are available in either two or three-electrode models. In the three-electrode model, the third electrode is used as the reference electrode and is allowed to:

A - Corrode freely
B - Remain outside of the flow stream
C - Be wired to ground
D - Be corrected for the solution resistivity

Correctness Rule: Single Correct Answer Required

Answer(s) Given: A
Correct Answer(s): A
Marked as: Correct

_______________________________________________

Question 2:

Pieces of metal that are inserted into a system to evaluate corrosion within a system are called:

A - Fluorocarbon gaskets
B - Tubular spacers
C - Coupons
D - Widgets

Correctness Rule: Single Correct Answer Required

Answer(s) Given: C
Correct Answer(s): C
Marked as: Correct

_______________________________________________

Question 3:

A steel coupon is installed in a corrosive system and left for 45 days. The coupon is rod shaped, 100 mm long and 5 mm in diameter. Over the 45-day period, it lost a total of 0.6754 g. The density of steel is 7.861 g/mL. The corrosion rate of the coupon is:

Corrosion rate (mm/year) =

A - 4.324 mm/year
B - 43.24 mm/year
C - 0.432 mm/year
D - .043 mm/year

Correctness Rule: Single Correct Answer Required

Answer(s) Given: C
Correct Answer(s): C
Marked as: Correct

_______________________________________________

Question 4:

Coupons are pieces of metal that are inserted into a system to evaluate:

A - System corrosiveness
B - Material performance
C - Inhibitor performance
D - All of the above

Correctness Rule: Single Correct Answer Required

Answer(s) Given: D
Correct Answer(s): D
Marked as: Correct

_______________________________________________

Question 5:

Record keeping procedures and accurate and timely reporting and recording of corrosion, damage done, and measures taken are not as important as the taking of readings from corrosion monitoring equipment.

A - True
B - False

Correctness Rule: Single Correct Answer Required

Answer(s) Given: B
Correct Answer(s): B
Marked as: Correct

_______________________________________________

Question 6:

The depth of corrosion pits is measured with a:

A - Vernier caliper
B - Galvanometer
C - Micrometer
D - Planimeter

Correctness Rule: Single Correct Answer Required

Answer(s) Given: C
Correct Answer(s): C
Marked as: Correct

_______________________________________________

Question 7:

When using radiography as an inspection tool, X-rays or gamma rays are used. The amount of radiation that passes through a metal in a given length of time is:

A - Inversely proportional to its thickness
B - Influenced by the magnetic lines of force
C - Directly proportional to its thickness
D - Not affected by its thickness

Correctness Rule: Single Correct Answer Required

Answer(s) Given: A
Correct Answer(s): A
Marked as: Correct

_______________________________________________

Question 8:

Gas systems have no electrolyte to carry current. The type of instrument used to measure corrosion from stack gases is called a:

A - Palladium foil hydrogen patch probe
B - Resistance probe
C - Galvanic probe
D - Linear polarization meter

Correctness Rule: Single Correct Answer Required

Answer(s) Given: B
Correct Answer(s): B
Marked as: Correct

_______________________________________________

Question 9:

The instrument that is best suited for taking readings of the corrosion rate occurring on a coupon or electrode at the moment the measurement is taken is a:

A - Cross-sectional conductor
B - Non-linear polarization meter
C - Linear polarization meter
D - Galvanic probe assembly

Correctness Rule: Single Correct Answer Required

Answer(s) Given: C
Correct Answer(s): C
Marked as: Correct

_______________________________________________

Question 10:

The term used to describe what is happening when thin layers slough off from the metal surface is:

A - Blistering or scaling
B - Definite surface corrosion
C - Pitting or grooving
D - Shallow metal attack

Correctness Rule: Single Correct Answer Required

Answer(s) Given: A
Correct Answer(s): A
Marked as: Correct

Question 1:

Electrical resistance probes work on the principle that:

A - As the area of a conductor increases, its resistance increases.
B - As the area of a conductor decreases, its resistance decreases.
C - As the area of a conductor decreases, its resistance increases.
D - None of the above

Correctness Rule: Single Correct Answer Required

Answer(s) Given: C
Correct Answer(s): C
Marked as: Correct

_______________________________________________

Question 2:

When using radiography as an inspection tool, X-rays or gamma rays are used. The amount of radiation that passes through a metal in a given length of time is:

A - Inversely proportional to its thickness
B - Influenced by the magnetic lines of force
C - Not affected by its thickness
D - Directly proportional to its thickness

Correctness Rule: Single Correct Answer Required

Answer(s) Given: A
Correct Answer(s): A
Marked as: Correct

_______________________________________________

Question 3:

The term used to describe what is happening when thin layers slough off from the metal surface is:

A - Shallow metal attack
B - Blistering or scaling
C - Pitting or grooving
D - Definite surface corrosion

Correctness Rule: Single Correct Answer Required

Answer(s) Given: B
Correct Answer(s): B
Marked as: Correct

_______________________________________________

Question 4:

Fluorescent dye penetrant will indicate cracks under:

A - Visible light
B - Infrared light
C - Gamma rays
D - Ultraviolet light

Correctness Rule: Single Correct Answer Required

Answer(s) Given: D
Correct Answer(s): D
Marked as: Correct

_______________________________________________

Question 5:

An electric resistance probe:

A - Will detect pitting
B - Cannot be used in a gas system to measure corrosion in stack gases
C - Requires electrolyte to carry current
D - Must be periodically removed and cleaned to remove corrosion product accumulations

Correctness Rule: Single Correct Answer Required

Answer(s) Given: D
Correct Answer(s): D
Marked as: Correct

_______________________________________________

Question 6:

The instrument that is best suited for taking readings of the corrosion rate occurring on a coupon or electrode at the moment the measurement is taken is a:

A - Cross-sectional conductor
B - Linear polarization meter
C - Galvanic probe assembly
D - Non-linear polarization meter

Correctness Rule: Single Correct Answer Required

Answer(s) Given: B
Correct Answer(s): B
Marked as: Correct

_______________________________________________

Question 7:

When reporting corrosion, it is important to note the:

A - Degree of attack at a given location
B - Description of the general nature and appearance of the corrosion
C - Location of the corrosion
D - All of the above

Correctness Rule: Single Correct Answer Required

Answer(s) Given: D
Correct Answer(s): D
Marked as: Correct

_______________________________________________

Question 8:

Gas systems have no electrolyte to carry current. The type of instrument used to measure corrosion from stack gases is called a:

A - Palladium foil hydrogen patch probe
B - Linear polarization meter
C - Resistance probe
D - Galvanic probe

Correctness Rule: Single Correct Answer Required

Answer(s) Given: C
Correct Answer(s): C
Marked as: Correct

_______________________________________________

Question 9:

The coupon must be placed in a representative location, and oriented in such a way that it will:

A - Not be visible to the outside of the flow stream
B - Induce turbulence in the flow stream
C - Not induce turbulence in the flow stream
D - Not contact the flow stream

Correctness Rule: Single Correct Answer Required

Answer(s) Given: C
Correct Answer(s): C
Marked as: Correct

_______________________________________________

Question 10:

When using a slip-in rack to hold coupons, the coupon holding rod is contained in the retraction chamber, which is:

A - Flanged to the gate valve
B - Mounted on the rod
C - Inserted through the drain vent
D - Flanged to the packing gland

Correctness Rule: Single Correct Answer Required

Answer(s) Given: A
Correct Answer(s): A
Marked as: Correct

Question 1:

The term used to describe corrosion when the attack is deep enough to catch a knife blade is:

A - Blistering
B - Definite surface corrosion
C - Grooved
D - Shallow metal attack

Correctness Rule: Single Correct Answer Required

Answer(s) Given: B
Correct Answer(s): B
Marked as: Correct

_______________________________________________

Question 2:

An electric resistance probe:

A - Must be periodically removed and cleaned to remove corrosion product accumulations
B - Cannot be used in a gas system to measure corrosion in stack gases
C - Requires electrolyte to carry current
D - Will detect pitting

Correctness Rule: Single Correct Answer Required

Answer(s) Given: A
Correct Answer(s): A
Marked as: Correct

_______________________________________________

Question 3:

Electrical resistance probes work on the principle that:

A - As the area of a conductor increases, its resistance increases.
B - As the area of a conductor decreases, its resistance decreases.
C - As the area of a conductor decreases, its resistance increases.
D - None of the above

Correctness Rule: Single Correct Answer Required

Answer(s) Given: C
Correct Answer(s): C
Marked as: Correct

_______________________________________________

Question 4:

The coupon must be placed in a representative location, and oriented in such a way that it will:

A - Not contact the flow stream
B - Not induce turbulence in the flow stream
C - Induce turbulence in the flow stream
D - Not be visible to the outside of the flow stream

Correctness Rule: Single Correct Answer Required

Answer(s) Given: B
Correct Answer(s): B
Marked as: Correct

_______________________________________________

Question 5:

A steel coupon is installed in a corrosive system and left for 45 days. The coupon is rod shaped, 100 mm long and 5 mm in diameter. Over the 45-day period, it lost a total of 0.6754 g. The density of steel is 7.861 g/mL. The corrosion rate of the coupon is:

Corrosion rate (mm/year) =

A - 0.432 mm/year
B - .043 mm/year
C - 43.24 mm/year
D - 4.324 mm/year

Correctness Rule: Single Correct Answer Required

Answer(s) Given: A
Correct Answer(s): A
Marked as: Correct

_______________________________________________

Question 6:

The instrument that is best suited for taking readings of the corrosion rate occurring on a coupon or electrode at the moment the measurement is taken is a:

A - Linear polarization meter
B - Galvanic probe assembly
C - Non-linear polarization meter
D - Cross-sectional conductor

Correctness Rule: Single Correct Answer Required

Answer(s) Given: A
Correct Answer(s): A
Marked as: Correct

_______________________________________________