Air Conditioning Flashcards
6 cards from real NATE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Air Conditioning flashcards as text
What refrigerant is most commonly used in modern residential air conditioning systems in the US?
Answer: R-410A
R-410A replaced R-22 as the standard residential AC refrigerant due to R-22's ozone-depleting properties.
What is the purpose of the metering device in a refrigeration circuit?
Answer: Reduce refrigerant pressure and control flow into the evaporator
The metering device reduces high-pressure liquid refrigerant to low-pressure liquid/vapor, controlling flow into the evaporator.
Which component in an air conditioning system is responsible for rejecting heat to the outdoors?
Answer: Condenser
The condenser releases heat absorbed from the indoor air to the outdoor environment.
What does superheat measure in a refrigeration system?
Answer: Temperature rise of vapor above the saturation point at a given pressure
Superheat is the number of degrees the refrigerant vapor temperature exceeds the saturation temperature at that pressure.
What is the typical target evaporator superheat range for a fixed-orifice metering device system?
Answer: 10–18°F
A fixed-orifice system typically targets 10–18°F of superheat at the evaporator outlet for proper refrigerant feed.
Which tool is used to measure the wet-bulb temperature when evaluating air conditioning performance?
Answer: Sling psychrometer
A sling psychrometer uses a wet-bulb and dry-bulb thermometer to measure relative humidity and wet-bulb temperature.