South Carolina Building Automation
Systems Technician Certification License
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationale 2026 Q&A| Instant Download
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1. A building automation system (BAS) primarily monitors and controls
which of the following?
A. Structural integrity of the building envelope
B. Mechanical, electrical, and life-safety systems
C. Fire code compliance documentation
D. Interior design aesthetics
Rationale: A BAS’s main purpose is to automate and optimize HVAC,
lighting, and safety systems, not aesthetics or documentation.
2. In a BAS network, which protocol is most commonly used for
interoperability between controllers and field devices?
A. Modbus
B. BACnet
C. HTTP
D. TCP/IP
Rationale: BACnet is the industry standard protocol for building
automation communication.
,3. What is the primary function of a programmable logic controller (PLC)
in a BAS?
A. Data storage
B. User authentication
C. Executing control logic for equipment
D. Visualizing dashboards
Rationale: PLCs execute control algorithms that directly manage
equipment operation.
4. A thermostat setpoint adjustment affects which control loop
component?
A. Sensor calibration
B. Controller output decision
C. Actuator mounting
D. Network addressing
Rationale: Changing a setpoint changes what the controller aims to
achieve in its output decisions.
5. In HVAC control, what does PID stand for?
A. Proportional, Integral, Derivative
B. Pressure, Inductance, Distribution
C. Pulse, Interval, Delta
D. Primary, Intermediate, Digital
Rationale: PID represents the three actions in a common control
algorithm used for continuous system regulation.
6. Which device measures space temperature and provides feedback to
the BAS?
A. Actuator
B. Damper
C. Thermostat sensor
D. Circuit breaker
, Rationale: A thermostat sensor measures temperature and sends
that data to controllers.
7. What is a staging control in HVAC systems?
A. A method of system isolation
B. Sequential activation of multiple units based on load
C. Emergency power off procedure
D. Network gateway redundancy
Rationale: Staging involves turning units on/off in order to match
load demand.
8. A VFD (Variable Frequency Drive) is used in BAS to:
A. Measure voltage fluctuations
B. Control motor speed
C. Switch circuits on/off
D. Convert AC to DC only
Rationale: A VFD varies motor speed to control fans and pumps
efficiently.
9. Which type of sensor detects humidity?
A. Thermocouple
B. Photocell
C. Hygrometer
D. Barometer
Rationale: A hygrometer measures moisture content in the air.
10. The purpose of demand control ventilation (DCV) is to:
A. Reduce static pressure
B. Adjust ventilation based on occupancy
C. Calibrate temperature sensors
D. Manage fire alarms
Rationale: DCV changes air intake based on detected occupancy or
CO₂ levels.
Systems Technician Certification License
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationale 2026 Q&A| Instant Download
1. A building automation system (BAS) primarily monitors and controls
which of the following?
A. Structural integrity of the building envelope
B. Mechanical, electrical, and life-safety systems
C. Fire code compliance documentation
D. Interior design aesthetics
Rationale: A BAS’s main purpose is to automate and optimize HVAC,
lighting, and safety systems, not aesthetics or documentation.
2. In a BAS network, which protocol is most commonly used for
interoperability between controllers and field devices?
A. Modbus
B. BACnet
C. HTTP
D. TCP/IP
Rationale: BACnet is the industry standard protocol for building
automation communication.
,3. What is the primary function of a programmable logic controller (PLC)
in a BAS?
A. Data storage
B. User authentication
C. Executing control logic for equipment
D. Visualizing dashboards
Rationale: PLCs execute control algorithms that directly manage
equipment operation.
4. A thermostat setpoint adjustment affects which control loop
component?
A. Sensor calibration
B. Controller output decision
C. Actuator mounting
D. Network addressing
Rationale: Changing a setpoint changes what the controller aims to
achieve in its output decisions.
5. In HVAC control, what does PID stand for?
A. Proportional, Integral, Derivative
B. Pressure, Inductance, Distribution
C. Pulse, Interval, Delta
D. Primary, Intermediate, Digital
Rationale: PID represents the three actions in a common control
algorithm used for continuous system regulation.
6. Which device measures space temperature and provides feedback to
the BAS?
A. Actuator
B. Damper
C. Thermostat sensor
D. Circuit breaker
, Rationale: A thermostat sensor measures temperature and sends
that data to controllers.
7. What is a staging control in HVAC systems?
A. A method of system isolation
B. Sequential activation of multiple units based on load
C. Emergency power off procedure
D. Network gateway redundancy
Rationale: Staging involves turning units on/off in order to match
load demand.
8. A VFD (Variable Frequency Drive) is used in BAS to:
A. Measure voltage fluctuations
B. Control motor speed
C. Switch circuits on/off
D. Convert AC to DC only
Rationale: A VFD varies motor speed to control fans and pumps
efficiently.
9. Which type of sensor detects humidity?
A. Thermocouple
B. Photocell
C. Hygrometer
D. Barometer
Rationale: A hygrometer measures moisture content in the air.
10. The purpose of demand control ventilation (DCV) is to:
A. Reduce static pressure
B. Adjust ventilation based on occupancy
C. Calibrate temperature sensors
D. Manage fire alarms
Rationale: DCV changes air intake based on detected occupancy or
CO₂ levels.
