3e1x1 CDC Vol. 2 Questions and
Answers 100% Pass
Why is proper airflow important in ventilation systems?
✔✔ It ensures effective air circulation and temperature regulation.
What tool is commonly used to measure air pressure in ductwork?
✔✔ A manometer.
How does a filter contribute to the performance of an air conditioning system?
✔✔ By removing particulates to improve air quality and protect components.
What is the function of a condenser in a refrigeration cycle?
✔✔ To release heat absorbed from the space being cooled.
Why is refrigerant charge critical to system performance?
✔✔ An improper charge can lead to inefficiency and potential damage.
1
,What is the role of an expansion valve in the refrigeration cycle?
✔✔ To reduce pressure and temperature of the refrigerant before entering the evaporator.
Why are regular inspections of duct systems necessary?
✔✔ To identify leaks, blockages, or inefficiencies.
How does a thermostat control a heating or cooling system?
✔✔ By regulating temperature based on user settings.
What safety device shuts off a system if the pressure becomes too high?
✔✔ A high-pressure cutout switch.
Why must condensate drain lines be kept clear?
✔✔ To prevent water buildup and potential system damage.
What is the purpose of insulation on refrigerant lines?
✔✔ To prevent energy loss and condensation buildup.
2
, How does a heat pump differ from a standard air conditioner?
✔✔ It can reverse the refrigeration cycle to provide both heating and cooling.
Why is airflow balancing critical in HVAC systems?
✔✔ It ensures consistent temperature and comfort throughout the building.
What tool measures relative humidity in a space?
✔✔ A hygrometer.
How is a refrigerant leak typically detected?
✔✔ Using electronic detectors, dye tests, or soapy water solutions.
Why are variable air volume (VAV) systems used in modern HVAC designs?
✔✔ To adjust airflow based on demand and improve energy efficiency.
What is the purpose of a damper in a ventilation system?
✔✔ To regulate or redirect airflow within ductwork.
3
Answers 100% Pass
Why is proper airflow important in ventilation systems?
✔✔ It ensures effective air circulation and temperature regulation.
What tool is commonly used to measure air pressure in ductwork?
✔✔ A manometer.
How does a filter contribute to the performance of an air conditioning system?
✔✔ By removing particulates to improve air quality and protect components.
What is the function of a condenser in a refrigeration cycle?
✔✔ To release heat absorbed from the space being cooled.
Why is refrigerant charge critical to system performance?
✔✔ An improper charge can lead to inefficiency and potential damage.
1
,What is the role of an expansion valve in the refrigeration cycle?
✔✔ To reduce pressure and temperature of the refrigerant before entering the evaporator.
Why are regular inspections of duct systems necessary?
✔✔ To identify leaks, blockages, or inefficiencies.
How does a thermostat control a heating or cooling system?
✔✔ By regulating temperature based on user settings.
What safety device shuts off a system if the pressure becomes too high?
✔✔ A high-pressure cutout switch.
Why must condensate drain lines be kept clear?
✔✔ To prevent water buildup and potential system damage.
What is the purpose of insulation on refrigerant lines?
✔✔ To prevent energy loss and condensation buildup.
2
, How does a heat pump differ from a standard air conditioner?
✔✔ It can reverse the refrigeration cycle to provide both heating and cooling.
Why is airflow balancing critical in HVAC systems?
✔✔ It ensures consistent temperature and comfort throughout the building.
What tool measures relative humidity in a space?
✔✔ A hygrometer.
How is a refrigerant leak typically detected?
✔✔ Using electronic detectors, dye tests, or soapy water solutions.
Why are variable air volume (VAV) systems used in modern HVAC designs?
✔✔ To adjust airflow based on demand and improve energy efficiency.
What is the purpose of a damper in a ventilation system?
✔✔ To regulate or redirect airflow within ductwork.
3
