South Carolina Boiler Water Treatment
Technician Certification License Exam
Practice Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. Which of the following best describes the primary purpose of boiler
water treatment in a high-pressure steam boiler system?
A. To increase the steam temperature beyond design limits
B. To prevent scale formation and corrosion that reduce heat transfer
and equipment life
C. To lower the boiler’s operating pressure
D. To reduce fuel consumption by altering combustion chemistry
The main function of boiler water treatment is to control scale,
corrosion, and deposits, ensuring efficient heat transfer and
extending equipment service life.
2. What is the most likely consequence of untreated hard water being
used in a steam boiler system?
A. Reduced steam velocity
B. Increased pH levels
C. Formation of calcium and magnesium scale on heat transfer
surfaces
D. Decreased steam quality due to oxygen enrichment
Untreated hard water deposits calcium and magnesium salts as
, scale, which impairs heat transfer and can lead to overheating and
failure.
3. Which parameter is most critical to monitor to control boiler
feedwater corrosivity?
A. Turbidity
B. pH level
C. Color
D. Odor
pH level is key in determining whether water is acidic or alkaline,
directly affecting corrosion rates in the system.
4. What is the primary function of an oxygen scavenger in boiler water
treatment?
A. To raise the pH
B. To reduce alkalinity
C. To chemically remove dissolved oxygen to prevent corrosion
D. To prevent foaming
Oxygen scavengers react with dissolved oxygen to form
non-corrosive compounds, protecting metal surfaces from oxidation.
5. Which boiler water test provides a measure of total dissolved solids
in the system?
A. Chloride test
B. Conductivity test
C. Hardness test
D. Alkalinity test
Conductivity correlates with the concentration of ionic substances in
water, giving an indication of total dissolved solids.
6. In a boiler system, what effect does foaming have on steam quality?
A. It increases steam temperature
B. It entrains water carryover, reducing steam quality
, C. It increases boiler efficiency
D. It purifies the steam
Foaming causes water droplets to be carried with the steam,
lowering purity and risking damage to downstream equipment.
7. Which chemical is commonly used as a scale inhibitor in boiler water
treatment?
A. Sulfuric acid
B. Polyphosphate compounds
C. Sodium chloride
D. Nitric acid
Polyphosphates sequester hardness ions, preventing them from
precipitating as scale.
8. What is the primary hazard associated with excessive boiler water
alkalinity?
A. Increased corrosion only
B. No significant hazard
C. Lower steam pressure
D. Caustic embrittlement of boiler metal
High alkalinity can concentrate in crevices, causing caustic
embrittlement and weakening boiler metal.
9. Which of the following is a major cause of boiler tube failure due to
corrosion?
A. High steam temperature
B. Presence of dissolved oxygen in feedwater
C. Excess conductivity
D. Water level too low
Dissolved oxygen causes oxidative corrosion of metal surfaces,
leading to thinning and eventual failure.
Technician Certification License Exam
Practice Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. Which of the following best describes the primary purpose of boiler
water treatment in a high-pressure steam boiler system?
A. To increase the steam temperature beyond design limits
B. To prevent scale formation and corrosion that reduce heat transfer
and equipment life
C. To lower the boiler’s operating pressure
D. To reduce fuel consumption by altering combustion chemistry
The main function of boiler water treatment is to control scale,
corrosion, and deposits, ensuring efficient heat transfer and
extending equipment service life.
2. What is the most likely consequence of untreated hard water being
used in a steam boiler system?
A. Reduced steam velocity
B. Increased pH levels
C. Formation of calcium and magnesium scale on heat transfer
surfaces
D. Decreased steam quality due to oxygen enrichment
Untreated hard water deposits calcium and magnesium salts as
, scale, which impairs heat transfer and can lead to overheating and
failure.
3. Which parameter is most critical to monitor to control boiler
feedwater corrosivity?
A. Turbidity
B. pH level
C. Color
D. Odor
pH level is key in determining whether water is acidic or alkaline,
directly affecting corrosion rates in the system.
4. What is the primary function of an oxygen scavenger in boiler water
treatment?
A. To raise the pH
B. To reduce alkalinity
C. To chemically remove dissolved oxygen to prevent corrosion
D. To prevent foaming
Oxygen scavengers react with dissolved oxygen to form
non-corrosive compounds, protecting metal surfaces from oxidation.
5. Which boiler water test provides a measure of total dissolved solids
in the system?
A. Chloride test
B. Conductivity test
C. Hardness test
D. Alkalinity test
Conductivity correlates with the concentration of ionic substances in
water, giving an indication of total dissolved solids.
6. In a boiler system, what effect does foaming have on steam quality?
A. It increases steam temperature
B. It entrains water carryover, reducing steam quality
, C. It increases boiler efficiency
D. It purifies the steam
Foaming causes water droplets to be carried with the steam,
lowering purity and risking damage to downstream equipment.
7. Which chemical is commonly used as a scale inhibitor in boiler water
treatment?
A. Sulfuric acid
B. Polyphosphate compounds
C. Sodium chloride
D. Nitric acid
Polyphosphates sequester hardness ions, preventing them from
precipitating as scale.
8. What is the primary hazard associated with excessive boiler water
alkalinity?
A. Increased corrosion only
B. No significant hazard
C. Lower steam pressure
D. Caustic embrittlement of boiler metal
High alkalinity can concentrate in crevices, causing caustic
embrittlement and weakening boiler metal.
9. Which of the following is a major cause of boiler tube failure due to
corrosion?
A. High steam temperature
B. Presence of dissolved oxygen in feedwater
C. Excess conductivity
D. Water level too low
Dissolved oxygen causes oxidative corrosion of metal surfaces,
leading to thinning and eventual failure.
