#1
Which of the following is NOT a component of an HVAC control system?
Compressor
ExplanationCompressor is a component of the refrigeration system, not the control system.
#2
What is the primary function of a thermostat in an HVAC system?
To control temperature
ExplanationThe thermostat regulates the temperature by controlling the HVAC system's operation based on the set temperature.
#3
What does AHU stand for in HVAC?
Air Handling Unit
ExplanationAHU is responsible for circulating and conditioning air within the HVAC system.
#4
Which of the following is a common communication protocol used in HVAC control systems?
BACnet
ExplanationBACnet is a widely used communication protocol for building automation and control networks.
#5
What is the role of a relay in HVAC control systems?
To switch electrical circuits
ExplanationRelays control the flow of electricity in HVAC systems, switching electrical circuits on or off.
#6
What is the purpose of a CO2 sensor in an HVAC system?
To monitor indoor air quality
ExplanationCO2 sensors measure carbon dioxide levels, indicating indoor air quality.
#7
Which type of control system adjusts output based on feedback from sensors?
Feedback control
ExplanationFeedback control systems adjust outputs based on information received from sensors to maintain desired conditions.
#8
In an HVAC system, what does VAV stand for?
Variable Air Volume
ExplanationVAV systems adjust the volume of air supplied to different zones based on heating and cooling needs.
#9
What is the purpose of a pressure transducer in an HVAC system?
To monitor duct pressure
ExplanationPressure transducers measure duct pressure, providing information for system adjustments.
#10
What is the function of an economizer in HVAC systems?
To reduce energy consumption
ExplanationEconomizers optimize energy use by incorporating outside air to cool or ventilate the space.
#11
Which of the following is an example of a pneumatic HVAC control system component?
Actuator
ExplanationActuators are common components in pneumatic HVAC systems, controlling airflow and other functions.
#12
What does 'BMS' stand for in the context of building HVAC systems?
Building Management System
ExplanationBMS oversees and manages various building systems, including HVAC, for optimal performance.
#13
What is the purpose of a PID controller in HVAC systems?
To control temperature, pressure, and flow
ExplanationPID controllers regulate temperature, pressure, and flow by adjusting system parameters.
#14
What does 'DDC' stand for in the context of HVAC controls?
Direct Digital Control
ExplanationDDC systems use digital technology to directly control HVAC equipment.
#15
In HVAC terminology, what does 'DOAS' stand for?
Direct Outdoor Air System
ExplanationDOAS systems supply outdoor air directly to the spaces they serve, improving indoor air quality.
#16
What is the purpose of an enthalpy wheel in an HVAC system?
To recover energy from exhaust air
ExplanationEnthalpy wheels recover energy from exhaust air, improving overall HVAC system efficiency.
#17
In HVAC terminology, what does 'ASHRAE' stand for?
American Society of Heating, Refrigerating and Air-Conditioning Engineers
ExplanationASHRAE is a professional organization setting standards for HVAC and building systems.