MACS 609 CERTIFICATION EXAM
The use of ultraviolet (UV) or fluorescent dyes in an HFO- Approved by some vehicle manufactures but not by others
1234yf system is:
One effect of some refrigerant gases in the atmosphere is Contribute to trapping heat
that they:
Which item is not mentioned in the SAE J2099 Standard of Sludge
refrigerant purity?
When it has been determined that an A/C system has a Perform a leak test procedure
low refrigerant charge, what should be done?
Which item is not mentioned in the SAE J1991 standard of Acid
refrigerant purity?
Which of the following is unlikely to affect refrigerant A/C Compressor
charge accuracy?
CFC-12 recovery equipment has SAE 3/8-inch service Quick-couple design
fittings. HFC-134a recovery equipment has:
What is the advantage of using refrigerant identification Allows the ability to determine what type of refrigerant is in system
equipment?
If an HFC-134a A/C system still has pressure after the first 2 minutes
refrigerant recovery process is complete (including the
five-minute pause), additional recovery is necessary until
the system vacuum level remains stable for:
Paid technicians who service or repair buses using HCFC- Must be Section 608 Type II Certified
22 as refrigerant, and/or service or repair aircraft or
ship/boat cargo refrigeration equipment:
Specific safety information for managing incidents Material safety data sheet (MSDS) for the chemical
involving refrigerants and other chemicals (inhalation,
spills, fires, etc.) is found in the:
To what does Global Warming Potential (GWP) refer? Relative ability to produce global warming effect
When performing engine pre-heat for refrigerant removal, Make sure the compressor is operating
the technician should do ALL of the following EXCEPT:
PAG lubricant: Is hygroscopic (absorbs moisture)
Electronic leak detectors certified to SAE J2791 have the 0.15 ounce (4 grams) per year
capability of identifying leakage rates as low as:
, MACS 609 CERTIFICATION EXAM
When using an HFC-134a refrigerant recovery machine, 5 minutes
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?
A/C system service equipment hoses must be equipped 12 inches
with shutoff valves located within _______ from the
"vehicle end" of the hoses.
To what does Ozone Depletion Potential (ODP) refer? Relative ability to destroy ozone
Which type of tank must be used during the transfer of Tanks marked DOT 4BA
refrigerant?
When can HFC-134a become combustible in a mobile air If shop air is used in the system in an attempt to check for leaks and HFC-134a is
conditioning system? present
Mineral-based lubricants are used in which type of mobile CFC-12
A/C system?
How much moisture is removed from a mobile A/C system Possibly none
during a typical evacuation?
When recovery/recycling equipment is used to remove Generally, very little, if any
refrigerant from a mobile A/C system, how much lubricant
will be removed during the operation?
Mobile A/C system design changes, new service To reduce lifetime refrigerant emissions
procedures and equipment have been developed for what
reason?
Why is it necessary to ensure that service port caps To minimize refrigerant loss
containing good seals are installed?
Which of the following is NOT a factor in how much The age of the vehicle
refrigerant can be recovered from an A/C system?
The U.S. EPA has classified HFO-1234yf as "Acceptable, The refrigerant may only be used in newly manufactured vehicles with components
subject to use conditions." That means: specifically designed for it
HFO-1234yf has been tested and found compatible with: PAG oil
To use an electronic leak detector, how much refrigerant About 10% to 15% of system charge
must a system contain?
What was a key design change for HFC-134a A/C systems Increased condenser capacity and airflow
versus CFC-12 A/C systems?
The use of ultraviolet (UV) or fluorescent dyes in an HFO- Approved by some vehicle manufactures but not by others
1234yf system is:
One effect of some refrigerant gases in the atmosphere is Contribute to trapping heat
that they:
Which item is not mentioned in the SAE J2099 Standard of Sludge
refrigerant purity?
When it has been determined that an A/C system has a Perform a leak test procedure
low refrigerant charge, what should be done?
Which item is not mentioned in the SAE J1991 standard of Acid
refrigerant purity?
Which of the following is unlikely to affect refrigerant A/C Compressor
charge accuracy?
CFC-12 recovery equipment has SAE 3/8-inch service Quick-couple design
fittings. HFC-134a recovery equipment has:
What is the advantage of using refrigerant identification Allows the ability to determine what type of refrigerant is in system
equipment?
If an HFC-134a A/C system still has pressure after the first 2 minutes
refrigerant recovery process is complete (including the
five-minute pause), additional recovery is necessary until
the system vacuum level remains stable for:
Paid technicians who service or repair buses using HCFC- Must be Section 608 Type II Certified
22 as refrigerant, and/or service or repair aircraft or
ship/boat cargo refrigeration equipment:
Specific safety information for managing incidents Material safety data sheet (MSDS) for the chemical
involving refrigerants and other chemicals (inhalation,
spills, fires, etc.) is found in the:
To what does Global Warming Potential (GWP) refer? Relative ability to produce global warming effect
When performing engine pre-heat for refrigerant removal, Make sure the compressor is operating
the technician should do ALL of the following EXCEPT:
PAG lubricant: Is hygroscopic (absorbs moisture)
Electronic leak detectors certified to SAE J2791 have the 0.15 ounce (4 grams) per year
capability of identifying leakage rates as low as:
, MACS 609 CERTIFICATION EXAM
When using an HFC-134a refrigerant recovery machine, 5 minutes
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?
A/C system service equipment hoses must be equipped 12 inches
with shutoff valves located within _______ from the
"vehicle end" of the hoses.
To what does Ozone Depletion Potential (ODP) refer? Relative ability to destroy ozone
Which type of tank must be used during the transfer of Tanks marked DOT 4BA
refrigerant?
When can HFC-134a become combustible in a mobile air If shop air is used in the system in an attempt to check for leaks and HFC-134a is
conditioning system? present
Mineral-based lubricants are used in which type of mobile CFC-12
A/C system?
How much moisture is removed from a mobile A/C system Possibly none
during a typical evacuation?
When recovery/recycling equipment is used to remove Generally, very little, if any
refrigerant from a mobile A/C system, how much lubricant
will be removed during the operation?
Mobile A/C system design changes, new service To reduce lifetime refrigerant emissions
procedures and equipment have been developed for what
reason?
Why is it necessary to ensure that service port caps To minimize refrigerant loss
containing good seals are installed?
Which of the following is NOT a factor in how much The age of the vehicle
refrigerant can be recovered from an A/C system?
The U.S. EPA has classified HFO-1234yf as "Acceptable, The refrigerant may only be used in newly manufactured vehicles with components
subject to use conditions." That means: specifically designed for it
HFO-1234yf has been tested and found compatible with: PAG oil
To use an electronic leak detector, how much refrigerant About 10% to 15% of system charge
must a system contain?
What was a key design change for HFC-134a A/C systems Increased condenser capacity and airflow
versus CFC-12 A/C systems?
