MACS 609 CERTIFICATION TEST NEWEST 2026
QUESTIONS and CORRECT DETAILED ANSWERS
ALREADY GRADED A+
Which type of tank must be used during the transfer of refrigerant? - CORRECT
ANSWER-Tanks marked DOT 4BA
When can HFC-134a become combustible in a mobile air conditioning system? -
CORRECT ANSWER-If shop air is used in the system in an attempt to check for
leaks and HFC-134a is present
Mineral-based lubricants are used in which type of mobile A/C system? -
CORRECT ANSWER-CFC-12
How much moisture is removed from a mobile A/C system during a typical
evacuation? - CORRECT ANSWER-Possibly none
When recovery/recycling equipment is used to remove refrigerant from a mobile
A/C system, how much lubricant will be removed during the operation? -
CORRECT ANSWER-Generally, very little, if any
, Mobile A/C system design changes, new service procedures and equipment have
been developed for what reason? - CORRECT ANSWER-To reduce lifetime
refrigerant emissions
The use of ultraviolet (UV) or fluorescent dyes in an HFO-1234yf system is: -
CORRECT ANSWER-Approved by some vehicle manufactures but not by others
One effect of some refrigerant gases in the atmosphere is that they: - CORRECT
ANSWER-Contribute to trapping heat
Which item is not mentioned in the SAE J2099 Standard of refrigerant purity? -
CORRECT ANSWER-Sludge
When it has been determined that an A/C system has a low refrigerant charge,
what should be done? - CORRECT ANSWER-Perform a leak test procedure
Which item is not mentioned in the SAE J1991 standard of refrigerant purity? -
CORRECT ANSWER-Acid
Which of the following is unlikely to affect refrigerant charge accuracy? -
CORRECT ANSWER-A/C Compressor
QUESTIONS and CORRECT DETAILED ANSWERS
ALREADY GRADED A+
Which type of tank must be used during the transfer of refrigerant? - CORRECT
ANSWER-Tanks marked DOT 4BA
When can HFC-134a become combustible in a mobile air conditioning system? -
CORRECT ANSWER-If shop air is used in the system in an attempt to check for
leaks and HFC-134a is present
Mineral-based lubricants are used in which type of mobile A/C system? -
CORRECT ANSWER-CFC-12
How much moisture is removed from a mobile A/C system during a typical
evacuation? - CORRECT ANSWER-Possibly none
When recovery/recycling equipment is used to remove refrigerant from a mobile
A/C system, how much lubricant will be removed during the operation? -
CORRECT ANSWER-Generally, very little, if any
, Mobile A/C system design changes, new service procedures and equipment have
been developed for what reason? - CORRECT ANSWER-To reduce lifetime
refrigerant emissions
The use of ultraviolet (UV) or fluorescent dyes in an HFO-1234yf system is: -
CORRECT ANSWER-Approved by some vehicle manufactures but not by others
One effect of some refrigerant gases in the atmosphere is that they: - CORRECT
ANSWER-Contribute to trapping heat
Which item is not mentioned in the SAE J2099 Standard of refrigerant purity? -
CORRECT ANSWER-Sludge
When it has been determined that an A/C system has a low refrigerant charge,
what should be done? - CORRECT ANSWER-Perform a leak test procedure
Which item is not mentioned in the SAE J1991 standard of refrigerant purity? -
CORRECT ANSWER-Acid
Which of the following is unlikely to affect refrigerant charge accuracy? -
CORRECT ANSWER-A/C Compressor
