BOC Level I Written Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. A preventive maintenance program in building operations primarily
aims to:
A. Increase emergency repairs
B. Reduce equipment lifespan
C. Prevent equipment failures through scheduled servicing
D. Eliminate the need for inspections
Correct answer: C
A preventive maintenance program is designed to reduce
breakdowns and extend equipment life by performing regular,
scheduled inspections and servicing before failures occur.
2. Which system is primarily responsible for maintaining indoor air
temperature and humidity?
A. Electrical distribution system
B. HVAC system
, C. Plumbing system
D. Fire protection system
Correct answer: B
HVAC systems regulate heating, ventilation, and air conditioning to
control indoor temperature and humidity for occupant comfort and
safety.
3. The main purpose of a building’s ventilation system is to:
A. Increase energy consumption
B. Remove and replace indoor air contaminants
C. Cool electrical panels
D. Increase indoor humidity levels
Correct answer: B
Ventilation systems improve indoor air quality by removing
pollutants and supplying fresh outdoor air.
4. Which safety procedure must be applied before servicing electrical
equipment?
A. Equipment acceleration
B. Lockout/Tagout (LOTO)
C. Chemical neutralization
D. Pressure boosting
Correct answer: B
Lockout/Tagout procedures ensure equipment is de-energized and
cannot be accidentally started during maintenance.
,5. A centrifugal pump is mainly used to:
A. Convert electrical energy into thermal energy
B. Move fluids through a system
C. Compress gases
D. Measure air quality
Correct answer: B
Centrifugal pumps transfer fluids by converting rotational energy
into fluid flow and pressure.
6. Boiler efficiency is primarily improved by:
A. Increasing fuel waste
B. Reducing heat transfer
C. Minimizing heat loss during combustion
D. Increasing exhaust emissions
Correct answer: C
Efficient boilers reduce heat loss and maximize energy transfer from
fuel to water or steam.
7. The primary function of a thermostat is to:
A. Measure water flow
B. Control temperature by switching systems on and off
C. Increase refrigerant pressure
D. Regulate electrical current
Correct answer: B
, A thermostat senses temperature changes and activates or
deactivates HVAC systems accordingly.
8. Which component distributes electrical power throughout a building?
A. Chiller
B. Switchgear
C. Cooling tower
D. Boiler
Correct answer: B
Switchgear controls, protects, and distributes electrical power to
various building systems.
9. A key indicator of poor indoor air quality is:
A. Stable temperature
B. High oxygen levels
C. Excessive CO₂ concentration
D. Low humidity only
Correct answer: C
Elevated carbon dioxide levels indicate insufficient ventilation and
poor indoor air quality.
10. The main purpose of insulation in buildings is to:
A. Increase heat loss
B. Reduce thermal transfer
C. Conduct electricity
D. Increase airflow
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. A preventive maintenance program in building operations primarily
aims to:
A. Increase emergency repairs
B. Reduce equipment lifespan
C. Prevent equipment failures through scheduled servicing
D. Eliminate the need for inspections
Correct answer: C
A preventive maintenance program is designed to reduce
breakdowns and extend equipment life by performing regular,
scheduled inspections and servicing before failures occur.
2. Which system is primarily responsible for maintaining indoor air
temperature and humidity?
A. Electrical distribution system
B. HVAC system
, C. Plumbing system
D. Fire protection system
Correct answer: B
HVAC systems regulate heating, ventilation, and air conditioning to
control indoor temperature and humidity for occupant comfort and
safety.
3. The main purpose of a building’s ventilation system is to:
A. Increase energy consumption
B. Remove and replace indoor air contaminants
C. Cool electrical panels
D. Increase indoor humidity levels
Correct answer: B
Ventilation systems improve indoor air quality by removing
pollutants and supplying fresh outdoor air.
4. Which safety procedure must be applied before servicing electrical
equipment?
A. Equipment acceleration
B. Lockout/Tagout (LOTO)
C. Chemical neutralization
D. Pressure boosting
Correct answer: B
Lockout/Tagout procedures ensure equipment is de-energized and
cannot be accidentally started during maintenance.
,5. A centrifugal pump is mainly used to:
A. Convert electrical energy into thermal energy
B. Move fluids through a system
C. Compress gases
D. Measure air quality
Correct answer: B
Centrifugal pumps transfer fluids by converting rotational energy
into fluid flow and pressure.
6. Boiler efficiency is primarily improved by:
A. Increasing fuel waste
B. Reducing heat transfer
C. Minimizing heat loss during combustion
D. Increasing exhaust emissions
Correct answer: C
Efficient boilers reduce heat loss and maximize energy transfer from
fuel to water or steam.
7. The primary function of a thermostat is to:
A. Measure water flow
B. Control temperature by switching systems on and off
C. Increase refrigerant pressure
D. Regulate electrical current
Correct answer: B
, A thermostat senses temperature changes and activates or
deactivates HVAC systems accordingly.
8. Which component distributes electrical power throughout a building?
A. Chiller
B. Switchgear
C. Cooling tower
D. Boiler
Correct answer: B
Switchgear controls, protects, and distributes electrical power to
various building systems.
9. A key indicator of poor indoor air quality is:
A. Stable temperature
B. High oxygen levels
C. Excessive CO₂ concentration
D. Low humidity only
Correct answer: C
Elevated carbon dioxide levels indicate insufficient ventilation and
poor indoor air quality.
10. The main purpose of insulation in buildings is to:
A. Increase heat loss
B. Reduce thermal transfer
C. Conduct electricity
D. Increase airflow
