NCARB Building Systems Integration 1 — Questions and Answers
Question 1: Which HVAC system uses a single duct at a constant volume to condition all zones in a building?
- Single-Zone Constant Air Volume (CAV) (Correct answer)
- Variable Air Volume (VAV)
- Fan Coil Unit System
- Chilled Beam System
Correct answer: Single-Zone Constant Air Volume (CAV)
A single-zone CAV system delivers a fixed quantity of conditioned air to one zone without modulating airflow volume.
Question 2: In plumbing design, what is the purpose of a P-trap?
- To maintain a water seal that prevents sewer gases from entering the building (Correct answer)
- To increase water pressure
- To filter debris from the drain line
- To measure flow rate
Correct answer: To maintain a water seal that prevents sewer gases from entering the building
A P-trap holds a water seal in its curved section, blocking sewer gases and odors from traveling back through the drain into the occupied space.
Question 3: Which electrical panel component protects circuits from overloads and short circuits?
- Circuit Breaker (Correct answer)
- Transformer
- Busbar
- Meter Socket
Correct answer: Circuit Breaker
Circuit breakers interrupt current flow when a fault or overload occurs, protecting wiring and equipment from heat damage and fire.
Question 4: What does the term 'R-value' measure in building assemblies?
- Thermal resistance of a material (Correct answer)
- Air infiltration rate
- Solar heat gain coefficient
- Vapor permeance
Correct answer: Thermal resistance of a material
R-value measures a material's resistance to heat flow; higher R-values indicate greater insulating effectiveness.
Question 5: Which fire suppression system is most appropriate for a computer server room?
- Clean Agent Suppression System (Correct answer)
- Wet Pipe Sprinkler System
- Deluge System
- Dry Pipe Sprinkler System
Correct answer: Clean Agent Suppression System
Clean agent systems use gaseous suppressants that extinguish fire without damaging sensitive electronic equipment or leaving residue.
Question 6: In a Variable Air Volume (VAV) HVAC system, how is thermal comfort controlled in individual zones?
- By modulating the volume of conditioned air supplied to each zone (Correct answer)
- By changing the temperature of the supply air
- By cycling the air handler on and off
- By adjusting chilled water flow centrally
Correct answer: By modulating the volume of conditioned air supplied to each zone
VAV systems vary the quantity of supply air delivered to each zone while maintaining a relatively constant supply air temperature.
NCARB Building Systems Integration 1
Which HVAC system uses a single duct at a constant volume to condition all zones in a building?