HVAC HVAC Tools and Equipment 1 — Questions and Answers
Question 1: Which tool is used to measure the refrigerant pressure on both the high and low sides of an HVAC system simultaneously?
- Manifold gauge set (Correct answer)
- Digital multimeter
- Anemometer
- Manometer
Correct answer: Manifold gauge set
A manifold gauge set connects to both the high-pressure and low-pressure service ports to read system pressures at the same time.
Question 2: What instrument is used to measure airflow velocity in HVAC ductwork?
- Manometer
- Psychrometer
- Anemometer (Correct answer)
- Hygrometer
Correct answer: Anemometer
An anemometer measures air velocity, which is then used with duct cross-sectional area to calculate airflow in CFM.
Question 3: A micron gauge (vacuum gauge) is primarily used during which HVAC service procedure?
- Charging the system with refrigerant
- Evacuating the system to remove moisture and non-condensables (Correct answer)
- Measuring superheat
- Testing electrical continuity
Correct answer: Evacuating the system to remove moisture and non-condensables
A micron gauge measures deep vacuum levels (in microns of mercury) to confirm the system has been properly evacuated before refrigerant charging.
Question 4: Which tool is used to flare the end of copper refrigerant tubing to create a leak-free mechanical connection?
- Swaging tool
- Tubing cutter
- Flaring tool (Correct answer)
- Pipe bender
Correct answer: Flaring tool
A flaring tool clamps the tubing and uses a cone-shaped mandrel to form a 45-degree flare at the tube end for flare fittings.
Question 5: What is the primary purpose of a refrigerant recovery machine?
- To charge a system with new refrigerant
- To remove and store refrigerant from a system before service (Correct answer)
- To mix refrigerant blends
- To test refrigerant purity
Correct answer: To remove and store refrigerant from a system before service
A recovery machine extracts refrigerant from an HVAC system and stores it in a recovery cylinder, as required by EPA Section 608 regulations.
Question 6: Which instrument measures the wet-bulb and dry-bulb temperatures used to determine relative humidity and enthalpy?
- Thermistor probe
- Sling psychrometer (Correct answer)
- Digital manometer
- Clamp meter
Correct answer: Sling psychrometer
A sling psychrometer uses two thermometers—one dry-bulb and one wet-bulb—to determine relative humidity by comparing their temperature readings.
HVAC HVAC Tools and Equipment 1
Which tool is used to measure the refrigerant pressure on both the high and low sides of an HVAC system simultaneously?