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
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller VasilyKichigin. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $13.48. You're not tied to anything after your purchase.