BOC BOC Building Automation and Controls

Question 1

What does BAS stand for in building operations?

Accepted Answer

Building Automation System

Answer

BAS stands for Building Automation System, which integrates HVAC, lighting, security, and other building systems under centralized monitoring and control.

Question 2

In a BAS, what does a DDC controller stand for?

Accepted Answer

Direct Digital Control

Answer

DDC stands for Direct Digital Control, where a microprocessor-based controller reads sensor inputs, executes control logic, and drives outputs to regulate building systems.

Question 3

What is the role of a sensor's 'setpoint' in a BAS control loop?

Accepted Answer

The desired target value the control system works to achieve and maintain

Answer

A setpoint is the target value (e.g., 72°F room temperature) that the controller continuously compares to the measured value to determine the corrective action needed.

Question 4

Which control strategy modulates equipment output proportionally to the difference between the measured value and the setpoint?

Accepted Answer

Proportional control

Answer

Proportional control adjusts output (e.g., valve position) in direct proportion to the error signal (difference between measured value and setpoint), providing smoother control than simple on/off.

Question 5

What is 'proportional-integral-derivative' (PID) control used for in building systems?

Accepted Answer

Precisely controlling a variable by combining proportional, accumulated error, and rate-of-change corrections

Answer

PID control combines three correction terms to minimize steady-state error, prevent overshoot, and respond quickly to disturbances, making it ideal for temperature and pressure loops.

BOC - Building Operator Certification Practice Test

BOC - Building Operator Certification Practice Test

BOC BOC Building Automation and Controls