PRACTICE EXAM: UNIVERSAL R-410A QUESTIONS AND ANSWERS 2025

PRACTICE EXAM: UNIVERSAL
R-410A

Which refrigerant has an ozone depletion potential of zero?


-R-22
-HCFC-22
-CFC-11
-R-134A - ANSWERS-R-134A


An advantage of ester-based oils such as Polyolester is:


-They have a wax-free composition
-They have low miscibility with R-410A
-They are very hygroscopic
-They trap moisture - ANSWERS-They have a wax-free composition


Polyalkylene Glycol (PAG) Oils:


-Are non-toxic if inhaled
-Are extremely hygroscopic
-Perform well in aluminum-on-steel applications
-All of the above - ANSWERS-Are extremely hygroscopic

, Charging an R-410A system until the sight glass is clear may result in:


-Compressor damage
-System overcharge
-Proper charge
-Both A and B - ANSWERS-Both A and B


The temperature of a single compound at 100% saturated vapor with
no superheat is:


-Greater than its saturation temperature for that pressure
-Equal to its saturation temperature for that pressure
-Less than its saturation temperature for that pressure
-None of the above - ANSWERS-Equal to its saturation temperature
for that pressure


R-410A systems may be topped off after a leak because:


-It has a very high temperature glide
-Its cylinder is rose
-It must be weighed in
-It behaves like a pure compound - ANSWERS-It behaves like a pure
compound