HVAC Unit 1: Review Questions and
Answers | Latest Version | 2025/2026 |
Correct & Verified
Why is system balancing important?
✔✔To ensure uniform airflow and comfort throughout the building.
What is a common symptom of dirty condenser coils?
✔✔High head pressure and reduced cooling efficiency.
Why is a manometer used in HVAC?
✔✔To measure gas or air pressure.
What is the function of an expansion tank in a hydronic system?
✔✔To absorb pressure changes due to water expansion.
Why is energy efficiency important in HVAC design?
✔✔To reduce operating costs and environmental impact.
What is a scroll compressor?
✔✔A compressor that uses two interleaving spirals to compress refrigerant efficiently.
What is short cycling in HVAC systems?
1
, ✔✔When equipment turns on and off too frequently, reducing efficiency.
Why is a flame sensor used in a furnace?
✔✔To detect ignition and ensure safe operation.
What is the purpose of a condensate trap?
✔✔To prevent air from entering the condensate drain system.
What is the function of a variable refrigerant flow (VRF) system?
✔✔To provide precise temperature control by modulating refrigerant flow.
Why is proper venting of a gas furnace critical?
✔✔To prevent buildup of carbon monoxide and other harmful gases.
What is the purpose of a sight glass in refrigeration?
✔✔To monitor refrigerant flow and detect moisture or bubbles.
Why is proper refrigerant line sizing critical?
✔✔To ensure efficient operation and correct pressure drop.
What is the purpose of duct insulation?
✔✔To prevent heat loss or gain and improve system efficiency.
2
Answers | Latest Version | 2025/2026 |
Correct & Verified
Why is system balancing important?
✔✔To ensure uniform airflow and comfort throughout the building.
What is a common symptom of dirty condenser coils?
✔✔High head pressure and reduced cooling efficiency.
Why is a manometer used in HVAC?
✔✔To measure gas or air pressure.
What is the function of an expansion tank in a hydronic system?
✔✔To absorb pressure changes due to water expansion.
Why is energy efficiency important in HVAC design?
✔✔To reduce operating costs and environmental impact.
What is a scroll compressor?
✔✔A compressor that uses two interleaving spirals to compress refrigerant efficiently.
What is short cycling in HVAC systems?
1
, ✔✔When equipment turns on and off too frequently, reducing efficiency.
Why is a flame sensor used in a furnace?
✔✔To detect ignition and ensure safe operation.
What is the purpose of a condensate trap?
✔✔To prevent air from entering the condensate drain system.
What is the function of a variable refrigerant flow (VRF) system?
✔✔To provide precise temperature control by modulating refrigerant flow.
Why is proper venting of a gas furnace critical?
✔✔To prevent buildup of carbon monoxide and other harmful gases.
What is the purpose of a sight glass in refrigeration?
✔✔To monitor refrigerant flow and detect moisture or bubbles.
Why is proper refrigerant line sizing critical?
✔✔To ensure efficient operation and correct pressure drop.
What is the purpose of duct insulation?
✔✔To prevent heat loss or gain and improve system efficiency.
2
