Tools & Equipment Operation Flashcards
7 cards from real CAR practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Tools & Equipment Operation flashcards as text
A technician is using a vacuum pump during refrigerant recovery preparation and observes the gauge will not pull below 500 microns. What is the most likely cause?
Answer: The vacuum pump oil is contaminated or the pump has a leak
Contaminated vacuum pump oil or a system leak are the most common causes of inability to reach deep vacuum, as both impair the pump's ability to remove moisture and non-condensables.
Which cutting tool is preferred for removing copper refrigerant lines from appliances without generating sparks that could ignite residual oil?
Answer: Tube cutter (pipe cutter)
A tube cutter severs copper tubing through a rolling, scored cut with no sparks, making it the safest option where residual refrigerant oil may be present.
What does a refrigerant identifier instrument detect that makes it valuable in an appliance recycling operation?
Answer: Refrigerant type and purity, including contamination or mixed refrigerants
A refrigerant identifier analyzes the composition of a refrigerant sample to confirm its type and flag contamination or mixed refrigerant blends before recovery.
When operating a hydraulic shear to cut appliance compressors, what must be done before each cut to protect the equipment?
Answer: Ensure the compressor is free of refrigerant and oil
Compressors must be fully de-oiled and de-refrigerated before shearing to prevent oil spray, flammable vapor release, and damage to hydraulic shear components.
A wire stripper tool used in appliance recycling to recover copper wiring is set to the wrong gauge. What is the likely result?
Answer: The copper wire will be nicked or cut, reducing its scrap value
Using a stripper set to a gauge smaller than the wire will nick or sever the copper conductor, reducing its scrap weight and market value.
Which instrument is used to verify that a refrigeration system has been completely evacuated of refrigerant before an appliance is crushed?
Answer: Pressure/vacuum gauge manifold
A pressure/vacuum gauge manifold confirms system pressure has reached atmospheric or below, verifying refrigerant removal prior to crushing or shredding.
During appliance recycling, a worker uses a pry bar to separate appliance panels and the bar slips unexpectedly. Which safe work practice would most reduce this risk?
Answer: Wearing leather work gloves and ensuring stable footing before prying
Wearing leather gloves protects hands if the pry bar slips, and stable footing prevents the worker from falling when sudden release occurs.