10 exam-style questions with answers and explanations, straight from our 1,030-question bank. Tap an answer to check yourself. When you're ready, take the scored version in the free practice test.
These 10 free R-410A questions are organized by exam domain, so you can see how each part of the Universal R-410A Certification blueprint is tested. Reveal the answer and explanation under each question.
A homeowner's R-22 split system has developed a leak and the homeowner asks whether it can be converted to a newer refrigerant instead of replaced. Which refrigerant is the appropriate retrofit candidate for an existing R-22 system?
Correct answer: B - R-407C, because its operating pressures are close to R-22
Because R-410A contains no chlorine, it has both a lower ozone depletion potential and a lower global warming potential than the R-22 it replaced.
Correct answer: B - False
A technician measures 400 psig discharge pressure and 118 psig suction pressure on an operating R-410A system. What is the compression ratio?
Correct answer: C - 3.13
At comparable operating conditions, the compressor discharge temperature of an R-410A system is lower than that of an R-22 system, even though R-410A operates at substantially higher pressure.
Correct answer: A - True
A technician charging an R-410A system with a thermostatic expansion valve measures 10 degrees F of superheat and concludes the charge is correct. Subcooling, however, is near zero. Why can superheat appear acceptable on an undercharged TXV system?
Correct answer: A - A TXV modulates to hold superheat nearly constant as charge varies
An R-410A condensing unit has been opened to replace a failed compressor. The replacement liquid line filter drier must have a minimum working pressure rating of:
Correct answer: C - 600 psi
A technician is adding refrigerant to an R-410A system from a cylinder equipped with a dip tube. To withdraw liquid refrigerant, the cylinder should be:
Correct answer: B - Positioned upright, since the dip tube reaches the bottom
The high-side gauge on a manifold set intended for R-410A service must be rated to:
Correct answer: C - 800 psig
A technician is calculating subcooling on an R-407C system. Which saturation temperature must be used?
Correct answer: B - The bubble point, which is the saturated liquid condition
A technician is preparing to recover refrigerant from a residential R-410A system. The correct recovery cylinder is identified by:
Correct answer: D - A rose-colored body, DOT 4BA400 or 4BW400
The full bank has 1,020 more R-410A questions with explanations.
Continue in the free practice test →
View plans