BOMI AIR HANDLING, WATER TREATMENT &
PLUMBING SYSTEMS EXAM 2026 COMPLETE
QUESTIONS AND ANSWERS | VERIFIED
SOLUTIONS | ACCURATE GUIDE | LATEST
UPDATED VERSION
• This guide contains 200 verified multiple-choice questions with correct
answers and EXPERT RATIONALE — designed to help you master BOMI Air
Handling, Water Treatment & Plumbing Systems through active recall and
concept reinforcement.
• Study tip: Read each question, select your answer mentally before checking,
then read the EXPERT RATIONALE to deepen your understanding of why the
correct option is right.
BOMI AIR HANDLING, WATER TREATMENT & PLUMBING SYSTEMS EXAM 2026
COMPLETE QUESTIONS AND ANSWERS | VERIFIED SOLUTIONS | ACCURATE
GUIDE | LATEST UPDATED VERSION
1. What is the primary function of an air handling unit (AHU)?
A. To generate electricity for HVAC systems
B. To supply and distribute conditioned air throughout a building
C. To treat wastewater before discharge
D. To regulate water pressure in plumbing lines
E. To pump chilled water through cooling coils
Correct Answer: B. To supply and distribute conditioned air throughout a
building
,EXPERT RATIONALE: An AHU conditions and circulates air through a building by housing
components such as heating/cooling coils, fans, and filters. It is the central component of
a building's air distribution system.
2. Which component of an AHU is responsible for removing airborne
particulates?
A. Heating coil
B. Mixing box
C. Air filter
D. Supply fan
E. Damper actuator
Correct Answer: C. Air filter
EXPERT RATIONALE: Air filters in an AHU trap dust, pollen, and other airborne particles
to maintain indoor air quality and protect downstream components from fouling.
3. What does MERV stand for in filter ratings?
A. Minimum Efficiency Reporting Value
B. Maximum Environmental Resistance Variable
C. Mechanical Energy Reduction Ventilation
D. Minimum Energy Reduction Variance
E. Maximum Efficiency Reporting Volume
Correct Answer: A. Minimum Efficiency Reporting Value
EXPERT RATIONALE: MERV is a standard that rates the overall effectiveness of air filters.
Higher MERV ratings indicate greater efficiency in capturing smaller particles.
,4. Which type of fan is most commonly used in AHUs for general ventilation?
A. Axial fan
B. Propeller fan
C. Centrifugal fan
D. Inline fan
E. Cross-flow fan
Correct Answer: C. Centrifugal fan
EXPERT RATIONALE: Centrifugal fans are the most widely used in AHUs because they
can handle the static pressure requirements of ductwork systems while providing
consistent airflow.
5. What is the purpose of the mixing box in an AHU?
A. To mix chemicals into the air stream
B. To blend return air with outdoor fresh air
C. To regulate steam pressure
D. To filter particulate matter from supply air
E. To control water flow through coils
Correct Answer: B. To blend return air with outdoor fresh air
EXPERT RATIONALE: The mixing box combines return air from the building with outdoor
air to achieve proper ventilation levels while improving energy efficiency by recycling
conditioned air.
6. What is the term for the process of removing moisture from air in an AHU?
A. Humidification
B. Filtration
, C. Dehumidification
D. Pressurization
E. Stratification
Correct Answer: C. Dehumidification
EXPERT RATIONALE: Dehumidification occurs when warm, moist air passes over a
cooling coil, causing moisture to condense and drip into a drain pan, reducing the
humidity of the supply air.
7. Which section of an AHU collects condensate from the cooling coil?
A. Filter section
B. Fan section
C. Mixing box
D. Drain pan
E. Preheat coil
Correct Answer: D. Drain pan
EXPERT RATIONALE: The drain pan is located beneath the cooling coil to collect
condensate that forms when warm, humid air is cooled below its dew point. Proper
maintenance of the drain pan prevents mold growth and water damage.
8. What does VFD stand for in HVAC systems?
A. Variable Frequency Drive
B. Ventilation Flow Damper
C. Variable Fan Deflector
D. Vacuum Force Device
E. Vane Flow Distributor
PLUMBING SYSTEMS EXAM 2026 COMPLETE
QUESTIONS AND ANSWERS | VERIFIED
SOLUTIONS | ACCURATE GUIDE | LATEST
UPDATED VERSION
• This guide contains 200 verified multiple-choice questions with correct
answers and EXPERT RATIONALE — designed to help you master BOMI Air
Handling, Water Treatment & Plumbing Systems through active recall and
concept reinforcement.
• Study tip: Read each question, select your answer mentally before checking,
then read the EXPERT RATIONALE to deepen your understanding of why the
correct option is right.
BOMI AIR HANDLING, WATER TREATMENT & PLUMBING SYSTEMS EXAM 2026
COMPLETE QUESTIONS AND ANSWERS | VERIFIED SOLUTIONS | ACCURATE
GUIDE | LATEST UPDATED VERSION
1. What is the primary function of an air handling unit (AHU)?
A. To generate electricity for HVAC systems
B. To supply and distribute conditioned air throughout a building
C. To treat wastewater before discharge
D. To regulate water pressure in plumbing lines
E. To pump chilled water through cooling coils
Correct Answer: B. To supply and distribute conditioned air throughout a
building
,EXPERT RATIONALE: An AHU conditions and circulates air through a building by housing
components such as heating/cooling coils, fans, and filters. It is the central component of
a building's air distribution system.
2. Which component of an AHU is responsible for removing airborne
particulates?
A. Heating coil
B. Mixing box
C. Air filter
D. Supply fan
E. Damper actuator
Correct Answer: C. Air filter
EXPERT RATIONALE: Air filters in an AHU trap dust, pollen, and other airborne particles
to maintain indoor air quality and protect downstream components from fouling.
3. What does MERV stand for in filter ratings?
A. Minimum Efficiency Reporting Value
B. Maximum Environmental Resistance Variable
C. Mechanical Energy Reduction Ventilation
D. Minimum Energy Reduction Variance
E. Maximum Efficiency Reporting Volume
Correct Answer: A. Minimum Efficiency Reporting Value
EXPERT RATIONALE: MERV is a standard that rates the overall effectiveness of air filters.
Higher MERV ratings indicate greater efficiency in capturing smaller particles.
,4. Which type of fan is most commonly used in AHUs for general ventilation?
A. Axial fan
B. Propeller fan
C. Centrifugal fan
D. Inline fan
E. Cross-flow fan
Correct Answer: C. Centrifugal fan
EXPERT RATIONALE: Centrifugal fans are the most widely used in AHUs because they
can handle the static pressure requirements of ductwork systems while providing
consistent airflow.
5. What is the purpose of the mixing box in an AHU?
A. To mix chemicals into the air stream
B. To blend return air with outdoor fresh air
C. To regulate steam pressure
D. To filter particulate matter from supply air
E. To control water flow through coils
Correct Answer: B. To blend return air with outdoor fresh air
EXPERT RATIONALE: The mixing box combines return air from the building with outdoor
air to achieve proper ventilation levels while improving energy efficiency by recycling
conditioned air.
6. What is the term for the process of removing moisture from air in an AHU?
A. Humidification
B. Filtration
, C. Dehumidification
D. Pressurization
E. Stratification
Correct Answer: C. Dehumidification
EXPERT RATIONALE: Dehumidification occurs when warm, moist air passes over a
cooling coil, causing moisture to condense and drip into a drain pan, reducing the
humidity of the supply air.
7. Which section of an AHU collects condensate from the cooling coil?
A. Filter section
B. Fan section
C. Mixing box
D. Drain pan
E. Preheat coil
Correct Answer: D. Drain pan
EXPERT RATIONALE: The drain pan is located beneath the cooling coil to collect
condensate that forms when warm, humid air is cooled below its dew point. Proper
maintenance of the drain pan prevents mold growth and water damage.
8. What does VFD stand for in HVAC systems?
A. Variable Frequency Drive
B. Ventilation Flow Damper
C. Variable Fan Deflector
D. Vacuum Force Device
E. Vane Flow Distributor
