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CA D62 Air And Water Balancing Contractor Exam Questions And Correct Answers (Verified Answers) Plus Rationale2026 Q&A| Instant Download Pdf
- What is the primary purpose of air balancing in HVAC systems?
- Reduce energy costs
- Improve system aesthetics
- Ensure proper airflow to all areas
- Increase humidity levels
Rationale: Proper air balancing ensures each space receives the
correct airflow as designed for comfort and system efficiency.
- What instrument is typically used to measure air velocity in ducts?
- Thermometer
- Anemometer
- Manometer
- Hygrometer
Rationale: Anemometers are specifically designed to measure air
velocity, which is crucial for balancing airflow.
- In water system balancing, what is the main parameter to measure?
- Water color
- pH level
- Flow rate
- Temperature
Rationale: Flow rate is measured to ensure each branch of the system
receives the correct amount of water for proper operation.
- What does a manometer measure?
- Air temperature
- Electrical resistance
- Pressure differences 1 / 3
- Relative humidity
Rationale: Manometers measure pressure differences, which are
critical in diagnosing airflow or water pressure issues.
- Which of the following is a common method for air balancing?
- Color matching
- Duct traverse
- Water sampling
- Pipe insulation
Rationale: Duct traverse involves measuring airflow at multiple
points across a duct to determine proper balancing.
- What is the main effect of an unbalanced air system?
- Lower energy costs
- Uneven temperature distribution
- Improved air quality
- Reduced noise
Rationale: An unbalanced system causes some areas to be too hot or
cold because airflow is not properly distributed.
- What is the purpose of a flow hood in air balancing?
- Increase airflow
- Measure duct pressure
- Measure airflow at diffusers and grilles
- Reduce duct leakage
Rationale: Flow hoods capture and measure air exiting diffusers to
confirm the system delivers design airflow.
- Which factor affects water flow in hydronic systems?
- Pipe color
- Water temperature
- Pipe diameter and valve settings
- Humidity
Rationale: Pipe diameter and valve settings directly control water
flow and distribution in a system.
- What unit is airflow commonly measured in?
- Gallons per minute (GPM)
- Pounds per square inch (PSI)
- Cubic feet per minute (CFM)
- BTU/hr 2 / 3
Rationale: Airflow in HVAC systems is measured in CFM to quantify
the volume of air moving through the system.
- What is the typical method to balance a fan coil unit?
- Adjust thermostat
- Adjust valves to achieve design flow
- Replace filters
- Paint coils
Rationale: Balancing fan coil units involves adjusting water or air
valves to ensure each unit receives the correct flow.
- What instrument is used to measure water pressure in a hydronic
- Thermocouple
- Hygrometer
- Pressure gauge
- Anemometer
system?
Rationale: Pressure gauges are standard instruments to measure
water pressure in piping systems.
- What is the effect of oversized ducts on airflow?
- Increase velocity
- Reduce noise
- Reduce velocity and potential system efficiency
- Improve system control
Rationale: Oversized ducts reduce air velocity, which can cause poor
mixing and uneven distribution.
- Which is a common sign of an unbalanced water system?
- Corrosion in pipes
- Excessive noise only
- Some radiators or terminals too hot or cold
- Low water pH
Rationale: Uneven heating or cooling across terminals indicates
improper water distribution and balancing issues.
- What is the purpose of an orifice plate in water systems?
- Measure temperature
- Filter impurities
- Restrict flow for measurement and balancing
- Increase pressure
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