HVAC Tools and Equipment Flashcards
6 cards from real HVAC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 HVAC Tools and Equipment flashcards as text
Which instrument is used to measure static pressure within an HVAC duct system?
Answer: Manometer
A manometer (or digital pressure gauge) measures the static pressure difference between two points in a duct system, typically in inches of water column (in. w.c.).
What is the purpose of a megohmmeter (megger) in HVAC electrical service?
Answer: Test insulation resistance of motor windings
A megohmmeter applies high DC voltage to motor windings to measure insulation resistance in megohms, revealing degraded or failing insulation.
A capacitor tester is used in HVAC service to verify:
Answer: Microfarad (µF) rating of start and run capacitors
Capacitor testers measure actual capacitance in microfarads to confirm the capacitor meets its rated value, since a weak capacitor causes motor start and run problems.
Which HVAC service tool uses ultrasonic technology to detect refrigerant or air leaks?
Answer: Ultrasonic leak detector
An ultrasonic leak detector senses the high-frequency sound produced by gas or air escaping through a small orifice, useful in noisy environments.
What tool is used to measure the temperature difference (delta-T) across an evaporator coil to assess system performance?
Answer: Digital contact thermometer with dual probes
A digital thermometer with dual probes simultaneously reads supply and return air temperatures so the technician can calculate the actual temperature drop across the coil.
A combustible gas detector in HVAC service is primarily used to locate:
Answer: Natural gas or propane leaks in the heating section
A combustible gas detector senses flammable gases such as natural gas or propane, alerting technicians to dangerous leaks near gas furnaces or heat exchangers.