The use of ultraviolet (UV) or fluorescent dyes in an HFO-1234yf system is: - Approved by some vehicle
manufactures but not by others
One effect of some refrigerant gases in the atmosphere is that they: - Contribute to trapping heat
Which item is not mentioned in the SAE J2099 Standard of refrigerant purity? - Sludge
When it has been determined that an A/C system has a low refrigerant charge, what should be done? -
Perform a leak test procedure
Which item is not mentioned in the SAE J1991 standard of refrigerant purity? - Acid
Which of the following is unlikely to affect refrigerant charge accuracy? - A/C Compressor
CFC-12 recovery equipment has SAE 3/8-inch service fittings. HFC-134a recovery equipment has: - Quick-
couple design
What is the advantage of using refrigerant identification equipment? - 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: - 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: - 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: - Material safety data sheet (MSDS) for the chemical
, To what does Global Warming Potential (GWP) refer? - Relative ability to produce global warming effect
When performing engine pre-heat for refrigerant removal, the technician should do ALL of the following
EXCEPT: - Make sure the compressor is operating
PAG lubricant: - Is hygroscopic (absorbs moisture)
Electronic leak detectors certified to SAE J2791 have the capability of identifying leakage rates as low as:
- Electronic leak detectors certified to SAE J2791 have the capability of identifying leakage rates as low
as:
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? - 5 minutes
A/C system service equipment hoses must be equipped with shutoff valves located within _______ from
the "vehicle end" of the hoses. - 12 inches
To what does Ozone Depletion Potential (ODP) refer? - Relative ability to destroy ozone
Which type of tank must be used during the transfer of refrigerant? - Tanks marked DOT 4BA
When can HFC-134a become combustible in a mobile air conditioning system? - 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? - CFC-12
How much moisture is removed from a mobile A/C system during a typical evacuation? - 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? - Generally, very little, if any
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