Arkansas AR-BAS Building
Automation Contractor Practice
Exam | Questions, Verified
Answers & Detailed Rationales |
Complete Contractor License
Exam Prep Study Guide |
Updated 2026
1. What is the primary purpose of a Building Automation
System (BAS)?
A. Increase structural capacity
B. Replace all mechanical equipment
C. Monitor, control, and optimize building systems
D. Eliminate the need for maintenance
Correct Answer: Monitor, control, and optimize building
systems
Rationale: A BAS integrates building systems such as
HVAC, lighting, and related equipment to improve
comfort, energy efficiency, reliability, and operational
control.
2. What does DDC stand for?
A. Direct Digital Communication
B. Direct Digital Control
C. Distributed Data Circuit
D. Digital Device Connection
Correct Answer: Direct Digital Control
,Rationale: DDC uses digital controllers, software,
sensors, and outputs to monitor and control building
equipment.
3. Which protocol was specifically developed for building
automation?
A. HTTP
B. FTP
C. SMTP
D. BACnet
Correct Answer: BACnet
Rationale: BACnet is a communication protocol designed
specifically for building automation and control
applications.
4. What is the primary function of a temperature
sensor?
A. Increase airflow
B. Start a motor
C. Measure temperature for the control system
D. Regulate electrical voltage
Correct Answer: Measure temperature for the control
system
Rationale: The BAS uses temperature measurements as
inputs to determine when and how equipment should
operate.
5. Which sensor is commonly used to measure
temperature electronically?
A. Current transformer
B. Thermistor
,C. Differential pressure switch
D. Flow switch
Correct Answer: Thermistor
Rationale: A thermistor changes resistance with
temperature and is commonly used in electronic
temperature sensors.
6. What is an actuator used for in a BAS?
A. Measure humidity
B. Store trend data
C. Move a valve or damper to a commanded position
D. Convert AC power to DC power
Correct Answer: Move a valve or damper to a
commanded position
Rationale: Actuators convert an electrical or pneumatic
control signal into mechanical movement.
7. A BAS output commanding a damper actuator to open
is an example of what?
A. Analog input
B. Binary input
C. Control output
D. Sensor input
Correct Answer: Control output
Rationale: The controller is sending a command to
another device, making the signal an output.
8. Which device typically provides a binary status
signal?
A. Temperature sensor
B. Humidity transmitter
, C. Fan status switch
D. Pressure transmitter
Correct Answer: Fan status switch
Rationale: A status switch generally indicates one of
two conditions, such as running/not running or
open/closed.
9. What is an analog input?
A. A two-state command only
B. A variable signal representing a measured value
C. A network cable
D. A circuit breaker
Correct Answer: A variable signal representing a
measured value
Rationale: Analog inputs represent continuously
variable quantities such as temperature, pressure,
humidity, or flow.
10. Which is an example of a binary output?
A. Space temperature
B. Duct pressure
C. Relative humidity
D. Fan start/stop command
Correct Answer: Fan start/stop command
Rationale: A fan start/stop command normally has two
states: on or off.
11. What is the purpose of a control loop?
A. Increase wire size
B. Maintain a controlled variable near a desired setpoint
Automation Contractor Practice
Exam | Questions, Verified
Answers & Detailed Rationales |
Complete Contractor License
Exam Prep Study Guide |
Updated 2026
1. What is the primary purpose of a Building Automation
System (BAS)?
A. Increase structural capacity
B. Replace all mechanical equipment
C. Monitor, control, and optimize building systems
D. Eliminate the need for maintenance
Correct Answer: Monitor, control, and optimize building
systems
Rationale: A BAS integrates building systems such as
HVAC, lighting, and related equipment to improve
comfort, energy efficiency, reliability, and operational
control.
2. What does DDC stand for?
A. Direct Digital Communication
B. Direct Digital Control
C. Distributed Data Circuit
D. Digital Device Connection
Correct Answer: Direct Digital Control
,Rationale: DDC uses digital controllers, software,
sensors, and outputs to monitor and control building
equipment.
3. Which protocol was specifically developed for building
automation?
A. HTTP
B. FTP
C. SMTP
D. BACnet
Correct Answer: BACnet
Rationale: BACnet is a communication protocol designed
specifically for building automation and control
applications.
4. What is the primary function of a temperature
sensor?
A. Increase airflow
B. Start a motor
C. Measure temperature for the control system
D. Regulate electrical voltage
Correct Answer: Measure temperature for the control
system
Rationale: The BAS uses temperature measurements as
inputs to determine when and how equipment should
operate.
5. Which sensor is commonly used to measure
temperature electronically?
A. Current transformer
B. Thermistor
,C. Differential pressure switch
D. Flow switch
Correct Answer: Thermistor
Rationale: A thermistor changes resistance with
temperature and is commonly used in electronic
temperature sensors.
6. What is an actuator used for in a BAS?
A. Measure humidity
B. Store trend data
C. Move a valve or damper to a commanded position
D. Convert AC power to DC power
Correct Answer: Move a valve or damper to a
commanded position
Rationale: Actuators convert an electrical or pneumatic
control signal into mechanical movement.
7. A BAS output commanding a damper actuator to open
is an example of what?
A. Analog input
B. Binary input
C. Control output
D. Sensor input
Correct Answer: Control output
Rationale: The controller is sending a command to
another device, making the signal an output.
8. Which device typically provides a binary status
signal?
A. Temperature sensor
B. Humidity transmitter
, C. Fan status switch
D. Pressure transmitter
Correct Answer: Fan status switch
Rationale: A status switch generally indicates one of
two conditions, such as running/not running or
open/closed.
9. What is an analog input?
A. A two-state command only
B. A variable signal representing a measured value
C. A network cable
D. A circuit breaker
Correct Answer: A variable signal representing a
measured value
Rationale: Analog inputs represent continuously
variable quantities such as temperature, pressure,
humidity, or flow.
10. Which is an example of a binary output?
A. Space temperature
B. Duct pressure
C. Relative humidity
D. Fan start/stop command
Correct Answer: Fan start/stop command
Rationale: A fan start/stop command normally has two
states: on or off.
11. What is the purpose of a control loop?
A. Increase wire size
B. Maintain a controlled variable near a desired setpoint
