EPA 609 MAIN EXAMINATION 2026 TEST QUESTIONS AND
ANSWERS GRADED A+
✔✔Stratosphere layer consists of about _____ of the available Ozone: - ✔✔90%
✔✔Ozone molecule consists of ______ atoms of oxygen - ✔✔Three
✔✔The thermodynamic properties of HFC-134a are similar to CFC-12 - ✔✔True
✔✔Montreal Protocol is signed in ______ by 23 counties including USA - ✔✔Sep, 1987
✔✔Halons were completely phased out by 1994 - ✔✔True
✔✔As per the CAA, all records related to entities of MVAC system services must be
maintained for ________ years - ✔✔Three
✔✔R-134a is flammable at ambient temperatures and atmospheric pressures -
✔✔False
✔✔Since _______, it has been mandatory to recycle HFC-134a as well as any other
automotive refrigerant before returning to that MVAC or sold: - ✔✔Jan 29, 1998
✔✔The color code for R-12 disposable refrigerant cylinders is ______ - ✔✔White
✔✔The "ozone layer" consists of ozone in which part of the atmosphere: -
✔✔Stratosphere
✔✔Which of the following will not react with ozone gas: - ✔✔Fluorine
✔✔_______ has replaced CFC-12 in all automotive applications - ✔✔HFC-134a
✔✔Since ______, it has been illegal to vent substitutes for CFC 3. and HCFC
refrigerants: - ✔✔Nov 15, 1995
✔✔The primary cause of over-pressurization of refrigeration cylinder is due to
overheating - ✔✔True
✔✔Use of Carbon dioxide (R-744) refrigerant results into a ______ efficiency cycle: -
✔✔Much lower
✔✔HFC-134a refrigerant has an Ozone Depletion Potential of: - ✔✔0.0
✔✔R-134a disposable refrigerant cylinder is ________ color coded: - ✔✔Light blue
, ✔✔Average ozone concentration in Earth's atmosphere as a whole is only about
______ parts per million - ✔✔0.3
✔✔Moisture content in recycled R-134a (HFC-134a) that has been directly removed
from and intended to be returned to a mobile air-conditioning system cannot exceed
_______ by weight - ✔✔50 PPM
✔✔Recovery cylinders are painted yellow in the shoulder area and _____ down the side
- ✔✔12 inches
✔✔Disposable cylinders are manufactured from: - ✔✔Steel
✔✔Ozone layer is present in both Stratosphere and mesosphere layers of earth's
atmosphere: - ✔✔False
✔✔Technicians who repair or service HFC-134a MVACs must be trained and certified
by an EPA-approved organization - ✔✔True
✔✔The sale of small containers of refrigerant under _______, including the one pound
cans, are restricted to only people certified in Section 609 - ✔✔20 lbs
✔✔R-134a refrigerant has low solubility in non-polar lubricants - ✔✔True
✔✔Disposable cylinders are manufactured to specifications established by: - ✔✔DOT
(Department of Transportation)
✔✔On _______, the U.S. EPA enacted the provisions of this agreement into regulations
for the United States - ✔✔Aug 1, 1988
✔✔Which of the following refrigerant has a molecular formula is C2H4F2: - ✔✔R-152a
✔✔With the rising cost of refrigerant, the value of the refrigerant stored in a 50-lb.
recovery tank is worth _______ the cost of a recovery tank - ✔✔5x
✔✔R- 134a is a corrosive refrigerant: - ✔✔False
✔✔Used cylinders can be recycled with other scrap metal. - ✔✔True
✔✔Refrigeration cylinders must be re-tested at ______ intervals. - ✔✔Five-year
✔✔Persons servicing MVACs do not have this choice they must be certified as _______
MVAC technicians if they perform the AC service for compensation. - ✔✔Section 609
ANSWERS GRADED A+
✔✔Stratosphere layer consists of about _____ of the available Ozone: - ✔✔90%
✔✔Ozone molecule consists of ______ atoms of oxygen - ✔✔Three
✔✔The thermodynamic properties of HFC-134a are similar to CFC-12 - ✔✔True
✔✔Montreal Protocol is signed in ______ by 23 counties including USA - ✔✔Sep, 1987
✔✔Halons were completely phased out by 1994 - ✔✔True
✔✔As per the CAA, all records related to entities of MVAC system services must be
maintained for ________ years - ✔✔Three
✔✔R-134a is flammable at ambient temperatures and atmospheric pressures -
✔✔False
✔✔Since _______, it has been mandatory to recycle HFC-134a as well as any other
automotive refrigerant before returning to that MVAC or sold: - ✔✔Jan 29, 1998
✔✔The color code for R-12 disposable refrigerant cylinders is ______ - ✔✔White
✔✔The "ozone layer" consists of ozone in which part of the atmosphere: -
✔✔Stratosphere
✔✔Which of the following will not react with ozone gas: - ✔✔Fluorine
✔✔_______ has replaced CFC-12 in all automotive applications - ✔✔HFC-134a
✔✔Since ______, it has been illegal to vent substitutes for CFC 3. and HCFC
refrigerants: - ✔✔Nov 15, 1995
✔✔The primary cause of over-pressurization of refrigeration cylinder is due to
overheating - ✔✔True
✔✔Use of Carbon dioxide (R-744) refrigerant results into a ______ efficiency cycle: -
✔✔Much lower
✔✔HFC-134a refrigerant has an Ozone Depletion Potential of: - ✔✔0.0
✔✔R-134a disposable refrigerant cylinder is ________ color coded: - ✔✔Light blue
, ✔✔Average ozone concentration in Earth's atmosphere as a whole is only about
______ parts per million - ✔✔0.3
✔✔Moisture content in recycled R-134a (HFC-134a) that has been directly removed
from and intended to be returned to a mobile air-conditioning system cannot exceed
_______ by weight - ✔✔50 PPM
✔✔Recovery cylinders are painted yellow in the shoulder area and _____ down the side
- ✔✔12 inches
✔✔Disposable cylinders are manufactured from: - ✔✔Steel
✔✔Ozone layer is present in both Stratosphere and mesosphere layers of earth's
atmosphere: - ✔✔False
✔✔Technicians who repair or service HFC-134a MVACs must be trained and certified
by an EPA-approved organization - ✔✔True
✔✔The sale of small containers of refrigerant under _______, including the one pound
cans, are restricted to only people certified in Section 609 - ✔✔20 lbs
✔✔R-134a refrigerant has low solubility in non-polar lubricants - ✔✔True
✔✔Disposable cylinders are manufactured to specifications established by: - ✔✔DOT
(Department of Transportation)
✔✔On _______, the U.S. EPA enacted the provisions of this agreement into regulations
for the United States - ✔✔Aug 1, 1988
✔✔Which of the following refrigerant has a molecular formula is C2H4F2: - ✔✔R-152a
✔✔With the rising cost of refrigerant, the value of the refrigerant stored in a 50-lb.
recovery tank is worth _______ the cost of a recovery tank - ✔✔5x
✔✔R- 134a is a corrosive refrigerant: - ✔✔False
✔✔Used cylinders can be recycled with other scrap metal. - ✔✔True
✔✔Refrigeration cylinders must be re-tested at ______ intervals. - ✔✔Five-year
✔✔Persons servicing MVACs do not have this choice they must be certified as _______
MVAC technicians if they perform the AC service for compensation. - ✔✔Section 609
