R-410A EXAM QUESTIONS WITH VERIFIED CORRECT ANSWERS

R-410A EXAM QUESTIONS WITH VERIFIED CORRECT
ANSWERS

QUESTION>The different leakage rate in fractionation is caused from... - CORRECT ANSWER~different
partial pressure of each constituent



QUESTION>Liquid charging should be done whenever possible and should be transferred from cylinder
as liquid to what? - CORRECT ANSWER~avoid fractionation



QUESTION>Throttle liquid when adding liquid refrigerant into the low side of the compressor to... -
CORRECT ANSWER~avoid compressor damage



QUESTION>What occurs when a refrigerant has a range of temperature in which it will boil and
condense at one pressure? - CORRECT ANSWER~temperature glide



QUESTION >R-22 can no longer be used in new equipment starting when? - CORRECT ANSWER~2010



QUESTION>Production of R-22 will cease when? - CORRECT ANSWER~2020



QUESTION>Manufacturer's must use alternative refrigerants, so far mostly consisting of - CORRECT
ANSWER~R-134a, R-410A and sometimes R-407C



QUESTION>Many other refrigerants depending on the application as well as R-407C are being used
where? - CORRECT ANSWER~Roof top units



QUESTION>R-410A is marketed under what brand names? - CORRECT ANSWER~AZ-20, Puron, and Suva



QUESTION>R-410A is what kind of mixture? - CORRECT ANSWER~binary (two part) near-azeotropic



QUESTION>The closer a blend comes to being a true azeotrope... - CORRECT ANSWER~the less
temperature glide it will have

, QUESTION>Cylinders containing R-410A are equipped with what? - CORRECT ANSWER~Dip tubes



QUESTION>R-410A cylinders are equipped with dip tubes to... - CORRECT ANSWER~allow liquid to be
removed with cylinder upright



QUESTION>the term used to describe the difference between the low and high sides of the compression
cycle - CORRECT ANSWER~Compression ratio



QUESTION>Compression ratio = - CORRECT ANSWER~absolute discharge pressure/absolute suction
pressure



QUESTION>Manufacturer's have redesigned their compressors with increased wall thickness due to
what? - CORRECT ANSWER~Higher pressure associated with R-410A



QUESTION>The internal pressure relief for R-410A will open at... - CORRECT ANSWER~550-625 psig



QUESTION>Suction and discharge pressure for R-410A is what? - CORRECT ANSWER~40-70% greater
than R-22



QUESTION>Due to it's higher vapor heat capacity, what can be said of the discharge temperature of R-
410A when compared to R-22? - CORRECT ANSWER~it is lower



QUESTION>Never heat an R-410A cylinder over... - CORRECT ANSWER~125F



QUESTION>Recovery cylinders require what? - CORRECT ANSWER~a 400 psig service pressure rating



QUESTION>The high pressure switch will open at... - CORRECT ANSWER~610 psig (plus or minus 10 psig)



QUESTION>The high pressure switch will close at... - CORRECT ANSWER~500 psig (plus or minus 15 psig)