EPA 608 Core Exam – 2026Revision | Verified Questions with Correct Answers A+

EPA SECTION 608 CORE (2019 revision) || solved correctly.

What zdoes zozone zin zthe zstratosphere zabove zthe zearth zconsist zof?

a. zMolecules zcontaining z2 zoxygen zatoms.

b. zMolecules zcontaining z3 zoxygen zatoms.

c. zMolecules zcontaining z4 zoxygen zatoms.

d. zMolecules zcontaining z5 zoxygen zatoms zcorrect zanswers zB



Which zof zthe zfollowing zrefrigerants zhas zthe zlowest zglobal zwarming zpotential?
a. zR-134a

b. zR-407C

c. zR-410A

d. zR-600a zcorrect zanswers zD



Which zof zthe zfollowing zgases zis zused zas zthe zbaseline zmeasurement zfor zglobal zwarming
zpotential?

a. zAmmonia

b. zCarbon zDioxide
c. zCFC-12

d. zPropane zcorrect zanswers zB



Which ztype zof zrefrigerant ztypically zhas zthe zlowest zglobal zwarming zpotential?

a. zHCFCs

b. zHFOs

c. zHFCs

d. zAll zare zequal zcorrect zanswers zB

,What zis zthe zstate zof zrefrigerant zentering zthe zcompressor zof za zrefrigeration zsystem?

a. zLow zpressure zsubcooled zliquid

b. zLow zpressure zsuperheated zvapor

c. zHigh zpressure zsubcooled zliquid
d. zHigh zpressure zsubcooled zvapor zcorrect zanswers zB



How zdoes zthe zglobal zwarming zpotential zof zR-410A zcompare zto zthat zof zcarbon zdioxide?

a. zIt zis zlower.

b. zThey zare zequal.

c. zIt zis zhundreds zof ztimes zgreater.

d. zIt zis zthousands zof ztimes zgreater. zcorrect zanswers zD



How zdo zthe zglobal zwarming zpotentials zof zisobutane z(R-600a), zpropane z(R-290), zand zR-
441A zcompare zto zthe zGWPs zof zHFC-134a, zR404A, zand zR-410A?
a. zThey zare zsignificantly zhigher.

b. zThey zare zsignificantly zlower.

c. zThey zare zapproximately zequal

d. zThey zare zslightly zhigher. zcorrect zanswers zB



What zare zthe zcharacteristics zof zhydrofluoroolefins z(HFOs)?

a. zNon-ozone zdepleting zand zhave zhigh zglobal zwarming zpotentials.
b. zNon-ozone zdepleting zand zhave zlow zglobal zwarming zpotentials.

c. zOzone zdepleting zand zhave zhigh zglobal zwarming zpotentials.

d. zOzone zdepleting zand zhave zlow zglobal zwarming zpotentials. zcorrect zanswers zB



Why zare zHFO zrefrigerants zless zflammable zthan zhydrocarbon zrefrigerants?
a. zThey zcontain zchlorine.

, b. zThey zcontain zbromine.

c. zThey zcontain zfluorine.

d. zThey zcontain zcarbon. zcorrect zanswers zC


Which zof zthe zfollowing zrefrigerants zis zan zHFO?

a. zR-1234yf

b. zR-123

c. zR-134a

d. zAll zthree zare zHFOs zcorrect zanswers zA



What zcharacteristics zof zHFC zrefrigerants zmake zthem zdamaging zto zthe zenvironment?

a. zThey zare ztoxic zto zplants zand zanimals zat zlow zdoses.
b. zThey zcontain zchlorine zwhich zdamages zthe zozone zlayer.

c. zThey zhave zhigh zOzone zDepletion zPotential z(ODP)

d. zThey zcan zhave zvery zhigh zglobal zwarming zpotentials. zcorrect zanswers zD



Why zare zsome zof zthe zhydrofluoroolefins zclassified zas zA2L?

a. zThey zhave ztoxicity zcharacteristics.

b. zThey zare zless zflammable zthan zhydrocarbon zrefrigerants, zbut zmost zare zstill zmildly
zflammable.

c. zThey zare zprohibited zfor zuse zin zthe zU.S.

d. zThey zhave zozone zdepleting zpotentials zand zhave zlow zglobal zwarming zpotentials. zcorrect
zanswers zB




How zmany zozone zmolecules zcan zeach zchlorine zatom zin zthe zstratosphere zdestroy?

a. z1,000 zmolecules

b. z100,000 zmolecules
c. z100,000,000 zmolecules