MACS 609 CERTIFICATION EXAMS
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)
Electronic leak detectors certified to SAE J2791 have the capability of
identifying leakage rates as low as: - ANSWER-0.15 ounce (4 grams) per year
When using an HFC-134a refrigerant recovery machine, after completing the
first recovery process, how long must you wait, then check the machine's
gauges for a rise in pressure above vacuum, which would indicate that the
system still contains some refrigerant? - ANSWER-5 minutes
A/C system service equipment hoses must be equipped with shutoff valves
located within _______ from the "vehicle end" of the hoses. - ANSWER-12
inches
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)
Electronic leak detectors certified to SAE J2791 have the capability of
identifying leakage rates as low as: - ANSWER-0.15 ounce (4 grams) per year
When using an HFC-134a refrigerant recovery machine, after completing the
first recovery process, how long must you wait, then check the machine's
gauges for a rise in pressure above vacuum, which would indicate that the
system still contains some refrigerant? - ANSWER-5 minutes
A/C system service equipment hoses must be equipped with shutoff valves
located within _______ from the "vehicle end" of the hoses. - ANSWER-12
inches
