California Building Automation Systems
Technician Practice Exam Questions And
Correct Answers (Verified Answers) Plus
Rationales 2025 Q&A | Instant
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1. What is the primary purpose of a building automation system (BAS)?
A. To monitor utility billing
B. To increase occupancy
C. To control and optimize building systems
D. To provide IT support
A BAS is used to control and monitor systems like HVAC, lighting, and
security to improve efficiency and comfort.
2. What protocol is most commonly used in open BAS communication?
A. USB
B. BACnet
C. HDMI
D. Modbus TCP
BACnet is a standard open protocol for BAS, enabling interoperability
among devices from different manufacturers.
,3. Which device acts as the interface between field devices and the BAS
network?
A. Router
B. Workstation
C. Controller
D. Sensor
Controllers process input from sensors and send commands to
actuators, serving as the brain of the BAS system.
4. Which of the following is NOT considered a field device in a BAS?
A. Thermostat
B. SQL Server
C. Temperature sensor
D. Damper actuator
SQL Server is a software component used for data management, not
a field device.
5. What is the function of a damper actuator in HVAC systems?
A. To cool the air
B. To heat the air
C. To control airflow
D. To detect humidity
A damper actuator adjusts dampers to regulate airflow through
ducts.
6. What component is used to measure air pressure in a duct system?
A. RTD sensor
B. Differential pressure sensor
C. Current transducer
D. Photoresistor
Differential pressure sensors detect pressure differences across a
duct to measure airflow or filter condition.
, 7. Which type of sensor provides the most accurate temperature
measurement for BAS?
A. Thermistor
B. Bimetallic strip
C. RTD (Resistance Temperature Detector)
D. Infrared sensor
RTDs offer high accuracy and stability for temperature
measurements in BAS applications.
8. What does PID stand for in a control loop?
A. Passive Integrated Device
B. Proportional-Integral-Derivative
C. Phase Input Delay
D. Power Isolation Device
PID refers to a control algorithm that maintains system variables like
temperature or pressure.
9. What is the advantage of using a variable frequency drive (VFD)?
A. Increases noise
B. Reduces load
C. Saves energy by controlling motor speed
D. Replaces circuit breakers
VFDs adjust motor speed based on load, reducing energy usage in
HVAC systems.
10. What is the role of a building management system (BMS)?
A. To control only lighting
B. To monitor and control building subsystems
C. To process payroll
D. To design HVAC layouts
A BMS centralizes control and monitoring of HVAC, lighting, fire
systems, and more.
Technician Practice Exam Questions And
Correct Answers (Verified Answers) Plus
Rationales 2025 Q&A | Instant
Download Pdf
1. What is the primary purpose of a building automation system (BAS)?
A. To monitor utility billing
B. To increase occupancy
C. To control and optimize building systems
D. To provide IT support
A BAS is used to control and monitor systems like HVAC, lighting, and
security to improve efficiency and comfort.
2. What protocol is most commonly used in open BAS communication?
A. USB
B. BACnet
C. HDMI
D. Modbus TCP
BACnet is a standard open protocol for BAS, enabling interoperability
among devices from different manufacturers.
,3. Which device acts as the interface between field devices and the BAS
network?
A. Router
B. Workstation
C. Controller
D. Sensor
Controllers process input from sensors and send commands to
actuators, serving as the brain of the BAS system.
4. Which of the following is NOT considered a field device in a BAS?
A. Thermostat
B. SQL Server
C. Temperature sensor
D. Damper actuator
SQL Server is a software component used for data management, not
a field device.
5. What is the function of a damper actuator in HVAC systems?
A. To cool the air
B. To heat the air
C. To control airflow
D. To detect humidity
A damper actuator adjusts dampers to regulate airflow through
ducts.
6. What component is used to measure air pressure in a duct system?
A. RTD sensor
B. Differential pressure sensor
C. Current transducer
D. Photoresistor
Differential pressure sensors detect pressure differences across a
duct to measure airflow or filter condition.
, 7. Which type of sensor provides the most accurate temperature
measurement for BAS?
A. Thermistor
B. Bimetallic strip
C. RTD (Resistance Temperature Detector)
D. Infrared sensor
RTDs offer high accuracy and stability for temperature
measurements in BAS applications.
8. What does PID stand for in a control loop?
A. Passive Integrated Device
B. Proportional-Integral-Derivative
C. Phase Input Delay
D. Power Isolation Device
PID refers to a control algorithm that maintains system variables like
temperature or pressure.
9. What is the advantage of using a variable frequency drive (VFD)?
A. Increases noise
B. Reduces load
C. Saves energy by controlling motor speed
D. Replaces circuit breakers
VFDs adjust motor speed based on load, reducing energy usage in
HVAC systems.
10. What is the role of a building management system (BMS)?
A. To control only lighting
B. To monitor and control building subsystems
C. To process payroll
D. To design HVAC layouts
A BMS centralizes control and monitoring of HVAC, lighting, fire
systems, and more.
