BOC Building Automation Systems
(BAS) Controls Module Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Which is the primary function of a Building Automation System (BAS)?
A Monitoring only electrical loads
B Integrating and controlling building mechanical and electrical
systems
C Replacing all manual maintenance tasks
D Providing backup power during outages
A BAS is designed to centrally monitor, coordinate, and control
building systems such as HVAC, lighting, and energy management to
improve efficiency and performance.
2. In BAS architecture, what does the Direct Digital Controller (DDC)
primarily do?
A Stores historical utility bills
, B Executes control logic for field devices
C Generates building blueprints
D Replaces sensors in the field
A DDCs process input signals and execute programmed control
sequences to manage building equipment such as AHUs and VAVs.
3. Which device typically measures temperature in a BAS?
A Actuator
B Sensor (thermistor or RTD)
C Relay
D Controller
A Temperature sensors convert thermal conditions into electrical
signals for monitoring and control purposes.
4. What is the role of an actuator in BAS?
A Measure airflow
B Send data to server
C Physically adjust equipment based on control signals
D Store system logs
A Actuators convert electronic signals into mechanical movement
such as opening valves or dampers.
5. Which protocol is commonly used in BAS communication?
A HTTP
B FTP
C BACnet
, D SMTP
A BACnet is a widely adopted communication protocol for building
automation systems enabling interoperability between devices.
6. What does a VAV system primarily control?
A Electrical distribution
B Air volume delivered to a space
C Water pressure in boilers
D Lighting levels
A Variable Air Volume systems adjust airflow to maintain
temperature while improving energy efficiency.
7. Which component initiates a control signal in BAS?
A Damper
B Controller
C Chiller
D Sensor housing
A Controllers process sensor inputs and initiate output signals to
maintain setpoints.
8. What is a setpoint in BAS terminology?
A Sensor calibration value
B Desired target value for a controlled variable
C Alarm threshold only
D Communication protocol setting
, A A setpoint is the desired value such as temperature or humidity
that the system tries to maintain.
9. Which system is most commonly integrated into BAS?
A Elevator braking system
B HVAC system
C Plumbing fixtures
D Firewood heating
A HVAC systems are central to BAS due to their high energy
consumption and controllability.
10. What does trending in BAS refer to?
A Manual log entry
B Recording system data over time
C Sensor replacement
D Alarm suppression
A Trending involves collecting historical data for analysis and
performance optimization.
11. What is a supervisory controller in BAS?
A Field sensor
B High-level controller managing multiple DDCs
C Manual switch
D Relay board
A Supervisory controllers coordinate multiple subsystems and
provide centralized control logic.
(BAS) Controls Module Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Which is the primary function of a Building Automation System (BAS)?
A Monitoring only electrical loads
B Integrating and controlling building mechanical and electrical
systems
C Replacing all manual maintenance tasks
D Providing backup power during outages
A BAS is designed to centrally monitor, coordinate, and control
building systems such as HVAC, lighting, and energy management to
improve efficiency and performance.
2. In BAS architecture, what does the Direct Digital Controller (DDC)
primarily do?
A Stores historical utility bills
, B Executes control logic for field devices
C Generates building blueprints
D Replaces sensors in the field
A DDCs process input signals and execute programmed control
sequences to manage building equipment such as AHUs and VAVs.
3. Which device typically measures temperature in a BAS?
A Actuator
B Sensor (thermistor or RTD)
C Relay
D Controller
A Temperature sensors convert thermal conditions into electrical
signals for monitoring and control purposes.
4. What is the role of an actuator in BAS?
A Measure airflow
B Send data to server
C Physically adjust equipment based on control signals
D Store system logs
A Actuators convert electronic signals into mechanical movement
such as opening valves or dampers.
5. Which protocol is commonly used in BAS communication?
A HTTP
B FTP
C BACnet
, D SMTP
A BACnet is a widely adopted communication protocol for building
automation systems enabling interoperability between devices.
6. What does a VAV system primarily control?
A Electrical distribution
B Air volume delivered to a space
C Water pressure in boilers
D Lighting levels
A Variable Air Volume systems adjust airflow to maintain
temperature while improving energy efficiency.
7. Which component initiates a control signal in BAS?
A Damper
B Controller
C Chiller
D Sensor housing
A Controllers process sensor inputs and initiate output signals to
maintain setpoints.
8. What is a setpoint in BAS terminology?
A Sensor calibration value
B Desired target value for a controlled variable
C Alarm threshold only
D Communication protocol setting
, A A setpoint is the desired value such as temperature or humidity
that the system tries to maintain.
9. Which system is most commonly integrated into BAS?
A Elevator braking system
B HVAC system
C Plumbing fixtures
D Firewood heating
A HVAC systems are central to BAS due to their high energy
consumption and controllability.
10. What does trending in BAS refer to?
A Manual log entry
B Recording system data over time
C Sensor replacement
D Alarm suppression
A Trending involves collecting historical data for analysis and
performance optimization.
11. What is a supervisory controller in BAS?
A Field sensor
B High-level controller managing multiple DDCs
C Manual switch
D Relay board
A Supervisory controllers coordinate multiple subsystems and
provide centralized control logic.
