BOC Building Automation and Controls Flashcards
6 cards from real BOC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 BOC Building Automation and Controls flashcards as text
What does BAS stand for in building operations?
Answer: Building Automation System
BAS stands for Building Automation System, which integrates HVAC, lighting, security, and other building systems under centralized monitoring and control.
In a BAS, what does a DDC controller stand for?
Answer: Direct Digital Control
DDC stands for Direct Digital Control, where a microprocessor-based controller reads sensor inputs, executes control logic, and drives outputs to regulate building systems.
What is the role of a sensor's 'setpoint' in a BAS control loop?
Answer: The desired target value the control system works to achieve and maintain
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.
Which control strategy modulates equipment output proportionally to the difference between the measured value and the setpoint?
Answer: Proportional control
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.
What is 'proportional-integral-derivative' (PID) control used for in building systems?
Answer: Precisely controlling a variable by combining proportional, accumulated error, and rate-of-change corrections
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.
In a BAS, what does the term 'trend log' refer to?
Answer: A time-stamped record of a sensor or control point value over time
A trend log records the value of a BAS point (sensor reading, output command, etc.) at regular intervals, enabling operators to analyze system behavior and diagnose issues.