Assessment and Evaluation Flashcards
7 cards from real EPA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Assessment and Evaluation flashcards as text
A technician pulls a system into a deep vacuum, isolates the pump, and watches the micron gauge rise and then level off. What does this most likely indicate?
Answer: Moisture still present in the system
A pressure rise that levels off means moisture is boiling off, while a steady, continuous rise points to a leak.
During a vacuum decay test, the micron reading keeps climbing steadily and never levels off. What is the most likely cause?
Answer: A system leak
A rise that never stops shows that atmospheric air is leaking into the system.
How can a technician check a recovery cylinder for noncondensables?
Answer: Compare the cylinder pressure with the pressure-temperature chart value at ambient temperature
Once the cylinder has stabilized at ambient temperature, a pressure above the saturation pressure shown on the P-T chart means noncondensables are present.
Which gas should be used to pressurize a system for a standing pressure leak test?
Answer: Dry nitrogen
Dry nitrogen is inert and moisture-free, while oxygen or compressed air can explode when mixed with oil.
A halide torch would NOT detect a leak in a system charged with which refrigerant?
Answer: R-134a
A halide torch reacts to chlorine, and R-134a is an HFC that contains no chlorine.
A burned-out hermetic compressor is replaced. Which test helps confirm whether acid contamination remains in the system?
Answer: Oil acid test
An oil acid test kit shows whether acid from the burnout is still in the system.
What is the maximum amount a refrigerant recovery cylinder may be filled to?
Answer: 80% of capacity by weight
Filling only to 80% leaves room for liquid to expand as the temperature rises.