MACS 609 CERTIFICATION QUESTIONS WITH SOLVED
SOLUTIONS
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
SOLUTIONS
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
