CIP Level 2 Theory Practical Questions Answer
2025/2026 Graded A+
Describe Galvanic Corrosion - Galvanic corrosion is an electrochemical action of two
dissimilar metals in the presence of an electrolyte and an electron conductive path,
which occurs when dissimilar metals come into contact.
Describe Cathodic Protection - Cathodic protection is the reduction or elimination of
corrosion by making the structure to be protected a cathode by means of an impressed
current or attachment to a galvanic anode.
The two primary types of cathodic protection are: - Impressed Current
Galvanic (Sacrificial)
Impressed current power sources include: - Rectified commercial power
Solar cells
Generators
Fuel cells
Wind-powered cells
Thermoelectric cells
Describe Cathodic Disbondment - Cathodic disbondment is the separation of the
coating from the surface through hydroxyl (OH-) formation due to increased (made more
negative) potential.
The principal component of mild carbon steel is - A. Iron (Fe)
The formation of a thin surface layer on metals, whether an oxide, carbonate, or other
compound, that slows the rate of the corrosion process is called? - D. Passivation
Which is the part of a corrosion cell where metal dissolves? - A. Anode
Which of these elements is likely to accelerate corrosion on a steel structure? - A. Salts
C. High temperatures
D. Pollutants
In a cathodic protection system the metal being protected is the? - B. Cathode
When parts of a metal surface are shielded from full exposure to the environment
because of the close proximity of another metal, corrosion at that location is identified
as? - D. Crevice corrosion
Cathodic protection using impressed current is most commonly used on? - C. Pipelines
Impressed current systems anodes include? - A. Graphite
,C. High silicon cast iron
Describe dehumidification: - Dehumidification is the process of removing moisture vapor
from the air to lower its dew point.
When planning enclosures, the following minimum requirements should be considered:
- • Must be large enough to contain the whole work area.
• Not be larger than the performance capabilities of the dehumidification equipment.
• Be sturdy enough to hold up to intended work activities, potential loads, and possible
inclement
weather.
• Have minimal leakage to maintain proper environmental conditions and ensure the
dehumidification
system operates efficiently.
Describe air turns (air changes): - • The air turnover principle eliminates air stratification,
or layering, in large open spaces by
recirculating the hot air that becomes trapped in the higher spaces
• The number of times it does this per hour is called air turns.
At and below what relative humidity does corrosion virtually cease? - 0.4
Describe two ways to reduce the relative humidity of the boundary layer: - • Increase the
surface temperature
• Reduce moisture content by dehumidification.
Types of dehumidification equipment include: - • Refrigeration and desiccant
Describe several benefits of dehumidification: - • Dries the air. Lowers the dew point.
Permits blasting the entire surface. Holds the blast with dry air. Helps in cleaning the
surface. Holds the surface during coating application.
You are the coating inspector on a project with dehumidification provided by a rotating
bed type dehumidifier. The silica gel has become contaminated. What do you expect to
happen with the silica gel? - D. It can no longer adsorb moisture
What effect does the rotating bed dehumidifier have on the treated ambient air? - B. It is
heated and the humidity decreases
Some general basic centrifugal blast setups include: - Tumbling Mill
Multi Table
Plain Table
Swing Table
Custom designed systems
Centrifugal blasting conveyor systems are commonly used for cleaning of: - Plate
, Rolled structural shapes
Large trusses
Girders
Portable centrifugal blasting systems can be used on: - Ship decks, hull sides, and
bottoms
Storage tanks
Concrete floors
Highways and bridge decks
Generally centrifugal blast systems are composed of the following elements: -
Centrifugal abrasive throwing wheel
The blast cabinet (or enclosure)
In fixed systems, some type of material handling system
Abrasive recycling system
A dust collector and vent-pipe system
Abrasives
The efficiency of the centrifugal blast wheel(s) depends on several factors. - Abrasive
operating mix
Size of the abrasive
Velocity of the abrasive coming off the wheel
Quantity and direction of the thrown abrasive
Condition of the feed parts
Low amperage readings on a centrifugal blasting machine could signify: - An abrasive-
starved wheel
A flooded or choked wheel
The functions of the centrifugal blasting machine separator include: - To control the
sizing of the abrasive mix
To remove sand, spent abrasives (fines), rust, dirt, and any other contaminants from the
abrasive stream
To control abrasive consumption
A well-balanced operating mix (working mix) of abrasive sizes will: - Provide
consistency of the finish.
Ensure uniform abrasive coverage.
Ensure conditioning of the abrasive for optimum cleaning.
Minimize lowest abrasive and machine part-wear and reduce downtime for
maintenance.
Some of the inspection concerns during centrifugal blasting include: - Monitor the dust
collector
Monitor the amperage of the wheel motors /low amperage
2025/2026 Graded A+
Describe Galvanic Corrosion - Galvanic corrosion is an electrochemical action of two
dissimilar metals in the presence of an electrolyte and an electron conductive path,
which occurs when dissimilar metals come into contact.
Describe Cathodic Protection - Cathodic protection is the reduction or elimination of
corrosion by making the structure to be protected a cathode by means of an impressed
current or attachment to a galvanic anode.
The two primary types of cathodic protection are: - Impressed Current
Galvanic (Sacrificial)
Impressed current power sources include: - Rectified commercial power
Solar cells
Generators
Fuel cells
Wind-powered cells
Thermoelectric cells
Describe Cathodic Disbondment - Cathodic disbondment is the separation of the
coating from the surface through hydroxyl (OH-) formation due to increased (made more
negative) potential.
The principal component of mild carbon steel is - A. Iron (Fe)
The formation of a thin surface layer on metals, whether an oxide, carbonate, or other
compound, that slows the rate of the corrosion process is called? - D. Passivation
Which is the part of a corrosion cell where metal dissolves? - A. Anode
Which of these elements is likely to accelerate corrosion on a steel structure? - A. Salts
C. High temperatures
D. Pollutants
In a cathodic protection system the metal being protected is the? - B. Cathode
When parts of a metal surface are shielded from full exposure to the environment
because of the close proximity of another metal, corrosion at that location is identified
as? - D. Crevice corrosion
Cathodic protection using impressed current is most commonly used on? - C. Pipelines
Impressed current systems anodes include? - A. Graphite
,C. High silicon cast iron
Describe dehumidification: - Dehumidification is the process of removing moisture vapor
from the air to lower its dew point.
When planning enclosures, the following minimum requirements should be considered:
- • Must be large enough to contain the whole work area.
• Not be larger than the performance capabilities of the dehumidification equipment.
• Be sturdy enough to hold up to intended work activities, potential loads, and possible
inclement
weather.
• Have minimal leakage to maintain proper environmental conditions and ensure the
dehumidification
system operates efficiently.
Describe air turns (air changes): - • The air turnover principle eliminates air stratification,
or layering, in large open spaces by
recirculating the hot air that becomes trapped in the higher spaces
• The number of times it does this per hour is called air turns.
At and below what relative humidity does corrosion virtually cease? - 0.4
Describe two ways to reduce the relative humidity of the boundary layer: - • Increase the
surface temperature
• Reduce moisture content by dehumidification.
Types of dehumidification equipment include: - • Refrigeration and desiccant
Describe several benefits of dehumidification: - • Dries the air. Lowers the dew point.
Permits blasting the entire surface. Holds the blast with dry air. Helps in cleaning the
surface. Holds the surface during coating application.
You are the coating inspector on a project with dehumidification provided by a rotating
bed type dehumidifier. The silica gel has become contaminated. What do you expect to
happen with the silica gel? - D. It can no longer adsorb moisture
What effect does the rotating bed dehumidifier have on the treated ambient air? - B. It is
heated and the humidity decreases
Some general basic centrifugal blast setups include: - Tumbling Mill
Multi Table
Plain Table
Swing Table
Custom designed systems
Centrifugal blasting conveyor systems are commonly used for cleaning of: - Plate
, Rolled structural shapes
Large trusses
Girders
Portable centrifugal blasting systems can be used on: - Ship decks, hull sides, and
bottoms
Storage tanks
Concrete floors
Highways and bridge decks
Generally centrifugal blast systems are composed of the following elements: -
Centrifugal abrasive throwing wheel
The blast cabinet (or enclosure)
In fixed systems, some type of material handling system
Abrasive recycling system
A dust collector and vent-pipe system
Abrasives
The efficiency of the centrifugal blast wheel(s) depends on several factors. - Abrasive
operating mix
Size of the abrasive
Velocity of the abrasive coming off the wheel
Quantity and direction of the thrown abrasive
Condition of the feed parts
Low amperage readings on a centrifugal blasting machine could signify: - An abrasive-
starved wheel
A flooded or choked wheel
The functions of the centrifugal blasting machine separator include: - To control the
sizing of the abrasive mix
To remove sand, spent abrasives (fines), rust, dirt, and any other contaminants from the
abrasive stream
To control abrasive consumption
A well-balanced operating mix (working mix) of abrasive sizes will: - Provide
consistency of the finish.
Ensure uniform abrasive coverage.
Ensure conditioning of the abrasive for optimum cleaning.
Minimize lowest abrasive and machine part-wear and reduce downtime for
maintenance.
Some of the inspection concerns during centrifugal blasting include: - Monitor the dust
collector
Monitor the amperage of the wheel motors /low amperage
