MACS 609 CERTIFICATION questions with correct
answers
The use of ultraviolet (UV) or fluorescent dyes in an HFO-1234yf system is: -
ANSWER Approved by some vehicle manufactures but not by others
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)
answers
The use of ultraviolet (UV) or fluorescent dyes in an HFO-1234yf system is: -
ANSWER Approved by some vehicle manufactures but not by others
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)
