NCARB Building Systems Integration 2 — Questions and Answers
Question 1: What is the primary purpose of a building's vapor retarder?
- To limit moisture diffusion through the building envelope (Correct answer)
- To increase air tightness
- To reflect solar radiation
- To improve acoustic performance
Correct answer: To limit moisture diffusion through the building envelope
A vapor retarder resists the diffusion of water vapor through wall, roof, or floor assemblies to prevent condensation within the construction.
Question 2: Which lighting control strategy reduces energy use by automatically turning off lights when a space is unoccupied?
- Occupancy Sensor Control (Correct answer)
- Daylight Harvesting
- Dimming Control
- Time-Clock Scheduling
Correct answer: Occupancy Sensor Control
Occupancy sensors detect motion or presence and switch lights off after a set period of inactivity, directly reducing wasted energy.
Question 3: A building's domestic hot water recirculation loop serves what function?
- Ensures hot water is immediately available at fixtures without waiting (Correct answer)
- Increases water pressure throughout the building
- Heats the building perimeter spaces
- Filters sediment from the supply water
Correct answer: Ensures hot water is immediately available at fixtures without waiting
A hot water recirculation loop continuously circulates hot water through the distribution piping so users get hot water instantly without wasting cold water.
Question 4: What is the purpose of electrical grounding in a building system?
- To provide a safe path for fault currents and protect people from electric shock (Correct answer)
- To increase voltage stability
- To reduce energy consumption
- To improve power factor
Correct answer: To provide a safe path for fault currents and protect people from electric shock
Grounding connects electrical equipment to earth, giving fault currents a low-resistance path that trips breakers instead of passing through people.
Question 5: Which system provides ventilation air specifically to meet ASHRAE 62.1 minimum outdoor air requirements?
- Dedicated Outdoor Air System (DOAS) (Correct answer)
- Return Air Plenum
- Exhaust Fan
- Economizer Cycle
Correct answer: Dedicated Outdoor Air System (DOAS)
A DOAS handles only ventilation air, conditioning 100% outdoor air to meet code minimums independently of the space conditioning system.
Question 6: In acoustic design, what does 'STC' (Sound Transmission Class) measure?
- A partition's ability to reduce airborne sound transmission between spaces (Correct answer)
- The absorption of sound within a room
- Impact noise through floor assemblies
- Reverberation time in a space
Correct answer: A partition's ability to reduce airborne sound transmission between spaces
STC rates how well a wall, floor, or ceiling assembly reduces airborne sound transmission; higher values indicate better isolation.
NCARB Building Systems Integration 2
What is the primary purpose of a building's vapor retarder?