CBCP CBCP Building Automation & Control Systems

Question 1

What is the primary function of a Building Automation System (BAS) in a commissioned facility?

Accepted Answer

Centralized monitoring and control of HVAC, lighting, and other building systems

Answer

A BAS integrates and automates control of HVAC, lighting, and other building systems to optimize performance and energy use.

Question 2

Which communication protocol is most widely used in modern BAS for interoperability between devices from different manufacturers?

Accepted Answer

BACnet

Answer

BACnet (Building Automation and Control Networks) is the ASHRAE/ANSI standard protocol enabling interoperability across different BAS vendors.

Question 3

During commissioning, what is a 'setpoint' in a BAS context?

Accepted Answer

The target value a control system attempts to maintain, such as 72°F room temperature

Answer

A setpoint is the desired target value that the control loop continuously works to achieve and maintain.

Question 4

What type of control loop continuously compares measured output to the setpoint and adjusts the control signal accordingly?

Accepted Answer

Closed-loop (feedback) control

Answer

Closed-loop feedback control uses the measured output to continuously correct deviations from the setpoint.

Question 5

A DDC (Direct Digital Control) controller receives a 4–20 mA signal from a duct static pressure sensor. What does the 4 mA signal represent?

Accepted Answer

The minimum (zero) value of the measured range

Answer

In a 4–20 mA loop, 4 mA corresponds to the minimum (0%) of the measurement range, and 20 mA corresponds to the maximum (100%).

CBCP - Certified Building Commissioning Professional Practice Test