MACS 609 PROFESSIONAL PREP
COLLECTION 2026 ACCURATE QUESTIONS
SOLUTIONS
● One effect of some refrigerant gases in the atmosphere is that they:
Answer: Contribute to trapping heat
● Which item is not mentioned in the SAE J2099 Standard of refrigerant
purity? Answer: Sludge
● When it has been determined that an A/C system has a low refrigerant
charge, what should be done? Answer: Perform a leak test procedure
● Which item is not mentioned in the SAE J1991 standard of refrigerant
purity? Answer: Acid
● Which of the following is unlikely to affect refrigerant charge
accuracy? Answer: A/C Compressor
● CFC-12 recovery equipment has SAE 3/8-inch service fittings. HFC-
134a recovery equipment has: Answer: Quick-couple design
, ● What is the advantage of using refrigerant identification equipment?
Answer: Allows the ability to determine what type of refrigerant is in
system
● If an HFC-134a A/C system still has pressure after the first refrigerant
recovery process is complete (including the five-minute pause),
additional recovery is necessary until the system vacuum level remains
stable for: Answer: 2 minutes
● Paid technicians who service or repair buses using HCFC-22 as
refrigerant, and/or service or repair aircraft or ship/boat cargo
refrigeration equipment: Answer: Must be Section 608 Type II Certified
● Specific safety information for managing incidents involving
refrigerants and other chemicals (inhalation, spills, fires, etc.) is found in
the: Answer: Material safety data sheet (MSDS) for the chemical
● To what does Global Warming Potential (GWP) refer? Answer:
Relative ability to produce global warming effect
● When performing engine pre-heat for refrigerant removal, the
technician should do ALL of the following EXCEPT: Answer: Make
sure the compressor is operating
● PAG lubricant: Answer: Is hygroscopic (absorbs moisture)
COLLECTION 2026 ACCURATE QUESTIONS
SOLUTIONS
● One effect of some refrigerant gases in the atmosphere is that they:
Answer: Contribute to trapping heat
● Which item is not mentioned in the SAE J2099 Standard of refrigerant
purity? Answer: Sludge
● When it has been determined that an A/C system has a low refrigerant
charge, what should be done? Answer: Perform a leak test procedure
● Which item is not mentioned in the SAE J1991 standard of refrigerant
purity? Answer: Acid
● Which of the following is unlikely to affect refrigerant charge
accuracy? Answer: A/C Compressor
● CFC-12 recovery equipment has SAE 3/8-inch service fittings. HFC-
134a recovery equipment has: Answer: Quick-couple design
, ● What is the advantage of using refrigerant identification equipment?
Answer: Allows the ability to determine what type of refrigerant is in
system
● If an HFC-134a A/C system still has pressure after the first refrigerant
recovery process is complete (including the five-minute pause),
additional recovery is necessary until the system vacuum level remains
stable for: Answer: 2 minutes
● Paid technicians who service or repair buses using HCFC-22 as
refrigerant, and/or service or repair aircraft or ship/boat cargo
refrigeration equipment: Answer: Must be Section 608 Type II Certified
● Specific safety information for managing incidents involving
refrigerants and other chemicals (inhalation, spills, fires, etc.) is found in
the: Answer: Material safety data sheet (MSDS) for the chemical
● To what does Global Warming Potential (GWP) refer? Answer:
Relative ability to produce global warming effect
● When performing engine pre-heat for refrigerant removal, the
technician should do ALL of the following EXCEPT: Answer: Make
sure the compressor is operating
● PAG lubricant: Answer: Is hygroscopic (absorbs moisture)
