MACS 609 CERTIFICATION EXAM NEWEST 2026
ACTUAL EXAM| COMPLETE REAL EXAM QUESTIONS
AND CORRECT VERIFIED ANSWERS/ ALREADY
GRADED A+| MACS 609 CERTIFICATION EXAM
REVIEW (MOST RECENT!!)
1. What is the primary function of the stratospheric ozone
layer?
A) Absorb infrared radiation
B) Protect Earth from ultraviolet (UV) radiation
C) Regulate global temperature
D) Control weather patterns
Correct Answer: B
Rationale: The ozone layer absorbs most of the Sun's harmful
ultraviolet radiation, protecting living organisms on Earth from
UV damage. This protection is a key reason why ozone-depleting
substances are regulated .
2. Which chemical compounds are primarily responsible for
ozone depletion?
1
,A) Hydrofluorocarbons (HFCs)
B) Chlorofluorocarbons (CFCs) and bromine compounds
C) Hydrocarbons (HCs)
D) Nitrous oxides (NOx)
Correct Answer: B
Rationale: CFCs and bromine-containing compounds release
chlorine and bromine atoms in the stratosphere, which catalyze
ozone destruction. This led to the Montreal Protocol phase-out .
3. What does Ozone Depletion Potential (ODP) measure?
A) The greenhouse effect of refrigerants
B) The capacity of a substance to destroy ozone relative to CFC-
11
C) The energy efficiency of refrigeration systems
D) The flammability of refrigerants
Correct Answer: B
Rationale: ODP quantifies how much a chemical contributes to
ozone depletion compared to a reference substance, typically
CFC-11. CFC-12 and CFC-11 both have ODP of 1.0 .
2
,4. What is the significance of Global Warming Potential (GWP)
in refrigerants?
A) It measures the refrigerant's toxicity
B) It assesses the refrigerant's impact on ozone depletion
C) It indicates the potential contribution to greenhouse effect and
climate change
D) It measures the flammability of refrigerants
Correct Answer: C
Rationale: GWP indicates how much heat a greenhouse gas traps
in the atmosphere over a specific time (usually 100 years),
relative to carbon dioxide (CO₂ = 1) .
5. Under the Clean Air Act Section 609, what are technicians
required to do?
A) Conduct environmental impact assessments
B) Obtain certification for servicing motor vehicle air conditioning
(MVAC) systems
C) Register refrigerant inventories annually
D) Submit monthly reports on refrigerant sales
Correct Answer: B
3
, Rationale: Section 609 mandates technician certification for
handling refrigerants in vehicle air conditioning systems to
prevent emissions. This applies to all technicians who service
MVAC systems for compensation .
6. Which of the following refrigerants has a zero ODP but a
high GWP?
A) R-12 (CFC-12)
B) R-134a (HFC-134a)
C) R-1234yf (HFO-1234yf)
D) R-22 (HCFC-22)
Correct Answer: B
Rationale: R-134a has zero ODP (no chlorine) but contributes
significantly to global warming due to its high GWP of 1430 .
7. Why is R-1234yf considered more environmentally friendly
than R-134a?
A) It is non-flammable
B) It has a lower GWP and is mildly flammable (A2L)
4
ACTUAL EXAM| COMPLETE REAL EXAM QUESTIONS
AND CORRECT VERIFIED ANSWERS/ ALREADY
GRADED A+| MACS 609 CERTIFICATION EXAM
REVIEW (MOST RECENT!!)
1. What is the primary function of the stratospheric ozone
layer?
A) Absorb infrared radiation
B) Protect Earth from ultraviolet (UV) radiation
C) Regulate global temperature
D) Control weather patterns
Correct Answer: B
Rationale: The ozone layer absorbs most of the Sun's harmful
ultraviolet radiation, protecting living organisms on Earth from
UV damage. This protection is a key reason why ozone-depleting
substances are regulated .
2. Which chemical compounds are primarily responsible for
ozone depletion?
1
,A) Hydrofluorocarbons (HFCs)
B) Chlorofluorocarbons (CFCs) and bromine compounds
C) Hydrocarbons (HCs)
D) Nitrous oxides (NOx)
Correct Answer: B
Rationale: CFCs and bromine-containing compounds release
chlorine and bromine atoms in the stratosphere, which catalyze
ozone destruction. This led to the Montreal Protocol phase-out .
3. What does Ozone Depletion Potential (ODP) measure?
A) The greenhouse effect of refrigerants
B) The capacity of a substance to destroy ozone relative to CFC-
11
C) The energy efficiency of refrigeration systems
D) The flammability of refrigerants
Correct Answer: B
Rationale: ODP quantifies how much a chemical contributes to
ozone depletion compared to a reference substance, typically
CFC-11. CFC-12 and CFC-11 both have ODP of 1.0 .
2
,4. What is the significance of Global Warming Potential (GWP)
in refrigerants?
A) It measures the refrigerant's toxicity
B) It assesses the refrigerant's impact on ozone depletion
C) It indicates the potential contribution to greenhouse effect and
climate change
D) It measures the flammability of refrigerants
Correct Answer: C
Rationale: GWP indicates how much heat a greenhouse gas traps
in the atmosphere over a specific time (usually 100 years),
relative to carbon dioxide (CO₂ = 1) .
5. Under the Clean Air Act Section 609, what are technicians
required to do?
A) Conduct environmental impact assessments
B) Obtain certification for servicing motor vehicle air conditioning
(MVAC) systems
C) Register refrigerant inventories annually
D) Submit monthly reports on refrigerant sales
Correct Answer: B
3
, Rationale: Section 609 mandates technician certification for
handling refrigerants in vehicle air conditioning systems to
prevent emissions. This applies to all technicians who service
MVAC systems for compensation .
6. Which of the following refrigerants has a zero ODP but a
high GWP?
A) R-12 (CFC-12)
B) R-134a (HFC-134a)
C) R-1234yf (HFO-1234yf)
D) R-22 (HCFC-22)
Correct Answer: B
Rationale: R-134a has zero ODP (no chlorine) but contributes
significantly to global warming due to its high GWP of 1430 .
7. Why is R-1234yf considered more environmentally friendly
than R-134a?
A) It is non-flammable
B) It has a lower GWP and is mildly flammable (A2L)
4
