HVAC /
EPA
/ /
608
/ /
Certification
/ /
Study Guide Questions With Correct Answers
/ // // // // //
Are //there //drop-in //replacements //for //R-
12 /
/systems? /
/Why /
/or /
/why /
/not? //- /
/correct /
/answer(s) /
/✔✔ /
/No /
/because //the //new //refrigerants //are //incompatible //with //the //oils //and //lubricants //used //in //R-
12 //systems.
What //type //of //oil //is //used //in //R-
134a /
/and /
/what /
/oils /
/will /
/it /
/mix /
/with? //- //correct //answer(s) //✔✔ //Ester //based //oils //and //they //do //not //mix //with //other //oils
,What /
/type //of //lubricant //is //used //with //HCFCs? //- //correct //answer(s) //✔✔ //Alkylbenzene //lubricant
What /
/is /
/difference /
/b/w /
/ternary //blend //a //azeotropic //blend? //- //correct //answer(s) //✔✔ //Ternary //blends //are //three-
part /
/mixtures /
/whereas /
/azeotropic /
/blends //are //blends //of //two //or //more //compounds //that //act //like //a //single //compound.
What /
/is /
/the /
/trait //of //a //hygroscopic //lubricant? //- //correct //answer(s) //✔✔ //It //absorbs //(takes //on) //moisture
What /
/is /
/temperature /
/glide /
/and /
/what /
/type /
/of /
/blend /
/won't /
/have /
/it? //- /
/correct /
/answer(s) /
/✔✔ //Temp. //blend //is //the //difference //between //the //dew //point //and //the //bubble //point
,Dew /
/Point //- /
/correct /
/answer(s) /
/✔✔ /
/Occurs /
/when //saturation //temp //in //evaporator //causes //refrigerant //to //change //from //liquid //to //vapor
Bubble /
/Point //- /
/correct /
/answer(s) /
/✔✔ /
/Occurs //when //saturation //temp //in //condenser //changes //refrigerant //from //vapor //to //liquid
Will /
/the /
/gases /
/in //
a/
/ternary /
/blend /
/leak /
/at /
/the /
/same /
/rate? /
/Why /
/or /
/why /
/not? //- /
/correct /
/answer(s) /
/✔✔ /
/No /
/because /
, /different /
/refrigerants /
/in //blend //have //different //vapor //pressures, //causing //them //to //leak //at //uneven //rates
Refrigeration /
/Process //- //correct //answer(s) //✔✔ //transfer //of //heat //from //one //place //to //another
Evaporator //- /
/correct /
/answer(s) /
/✔✔ /
/Absorbs /
/heat /
/into /
/system /
/from /
/space /
/to /
/be /
/cooled. /
/Absorption /
/of /
/heat /
/causes /
/refrigerant /
/to //boil. //Upon //leaving, //refrigerant //changed //to //low //pressure, //low //temperature //vapor
Compressor //- /
/correct //answer(s) //✔✔ //Takes //low //pressure, //low //temp //vapor //and //changes //it //to //a //high-
temp, //high-pressure, //superheated //vapor //and //delivers //it //to //the //condenser
Condenser //- /
/correct //answer(s) //✔✔ //Rejects //heat //from //system //and //changes //refrigerant //from //high-
temp, //high-pressure //vapor //into //high-pressure, //high-temp //liquid
EPA
/ /
608
/ /
Certification
/ /
Study Guide Questions With Correct Answers
/ // // // // //
Are //there //drop-in //replacements //for //R-
12 /
/systems? /
/Why /
/or /
/why /
/not? //- /
/correct /
/answer(s) /
/✔✔ /
/No /
/because //the //new //refrigerants //are //incompatible //with //the //oils //and //lubricants //used //in //R-
12 //systems.
What //type //of //oil //is //used //in //R-
134a /
/and /
/what /
/oils /
/will /
/it /
/mix /
/with? //- //correct //answer(s) //✔✔ //Ester //based //oils //and //they //do //not //mix //with //other //oils
,What /
/type //of //lubricant //is //used //with //HCFCs? //- //correct //answer(s) //✔✔ //Alkylbenzene //lubricant
What /
/is /
/difference /
/b/w /
/ternary //blend //a //azeotropic //blend? //- //correct //answer(s) //✔✔ //Ternary //blends //are //three-
part /
/mixtures /
/whereas /
/azeotropic /
/blends //are //blends //of //two //or //more //compounds //that //act //like //a //single //compound.
What /
/is /
/the /
/trait //of //a //hygroscopic //lubricant? //- //correct //answer(s) //✔✔ //It //absorbs //(takes //on) //moisture
What /
/is /
/temperature /
/glide /
/and /
/what /
/type /
/of /
/blend /
/won't /
/have /
/it? //- /
/correct /
/answer(s) /
/✔✔ //Temp. //blend //is //the //difference //between //the //dew //point //and //the //bubble //point
,Dew /
/Point //- /
/correct /
/answer(s) /
/✔✔ /
/Occurs /
/when //saturation //temp //in //evaporator //causes //refrigerant //to //change //from //liquid //to //vapor
Bubble /
/Point //- /
/correct /
/answer(s) /
/✔✔ /
/Occurs //when //saturation //temp //in //condenser //changes //refrigerant //from //vapor //to //liquid
Will /
/the /
/gases /
/in //
a/
/ternary /
/blend /
/leak /
/at /
/the /
/same /
/rate? /
/Why /
/or /
/why /
/not? //- /
/correct /
/answer(s) /
/✔✔ /
/No /
/because /
, /different /
/refrigerants /
/in //blend //have //different //vapor //pressures, //causing //them //to //leak //at //uneven //rates
Refrigeration /
/Process //- //correct //answer(s) //✔✔ //transfer //of //heat //from //one //place //to //another
Evaporator //- /
/correct /
/answer(s) /
/✔✔ /
/Absorbs /
/heat /
/into /
/system /
/from /
/space /
/to /
/be /
/cooled. /
/Absorption /
/of /
/heat /
/causes /
/refrigerant /
/to //boil. //Upon //leaving, //refrigerant //changed //to //low //pressure, //low //temperature //vapor
Compressor //- /
/correct //answer(s) //✔✔ //Takes //low //pressure, //low //temp //vapor //and //changes //it //to //a //high-
temp, //high-pressure, //superheated //vapor //and //delivers //it //to //the //condenser
Condenser //- /
/correct //answer(s) //✔✔ //Rejects //heat //from //system //and //changes //refrigerant //from //high-
temp, //high-pressure //vapor //into //high-pressure, //high-temp //liquid
