MACS 609 CERTIFICATION EXAM QUESTIONS &
ANSWERS CORRECT 100%
The use of ultraviolet (UV) or fluorescent dyes in an HFO-1234yf system is: - answers
Approved by some vehicle manufactures but not by others
One effect of some refrigerant gases in the atmosphere is that they: - answers
Contribut...
MACS 609 CERTIFICATION EXAM QUESTIONS & ANSWERS CORRECT 100% The use of ultraviolet (UV) or fluorescent dyes in an HFO -1234yf system is: - answers Approved by some vehicle manufactures but not by others One effect of some refrigerant gases in th e atmosphere is that they: - answers Contribute to trapping heat Which item is not mentioned in the SAE J2099 Standard of refrigerant purity? - answers Sludge When it has been determined that an A/C system has a low refrigerant charge, what should be done? - answers Perform a leak test procedure Which item is not mentioned in the SAE J1991 standard of refrigerant purity? - answers Acid Which of the following is unlikely to affect refrigerant charge accuracy? - answers A/C Compressor CFC-12 re covery equipment has SAE 3/8 -inch service fittings. HFC -134a recovery equipment has: - answers Quick -couple design What is the advantage of using refrigerant identification equipment? - answers Allows the ability to determine what type of refrigerant i s 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: - answers 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: - answers 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: - answers Material safety data sheet (MSDS) for the chemical To what does Global Warming Potential (GWP) refer? - answers Relative ability to produce global w arming effect When performing engine pre -heat for refrigerant removal, the technician should do ALL of the following EXCEPT: - answers Make sure the compressor is operating PAG lubricant: - answers Is hygroscopic (absorbs moisture) Electronic leak detectors certified to SAE J2791 have the capability of identifying leakage rates as low as: - answers Electronic leak detectors certified to SAE J2791 have the capability of identifying leakage rates as low as: When using an HFC -134a refrigerant recove ry 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? - answers 5 minutes A/C system se rvice equipment hoses must be equipped with shutoff valves located within _______ from the "vehicle end" of the hoses. - answers 12 inches To what does Ozone Depletion Potential (ODP) refer? - answers Relative ability to destroy ozone Which type of t ank must be used during the transfer of refrigerant? - answers Tanks marked DOT 4BA When can HFC -134a become combustible in a mobile air conditioning system? - answers If shop air is used in the system in an attempt to check for leaks and HFC -
134a is p resent Mineral -based lubricants are used in which type of mobile A/C system? - answers CFC-12 How much moisture is removed from a mobile A/C system during a typical evacuation? - answers Possibly none When recovery/recycling equipment is used to re move refrigerant from a mobile A/C system, how much lubricant will be removed during the operation? - answers Generally, very little, if any Mobile A/C system design changes, new service procedures and equipment have been developed for what reason? - answers To reduce lifetime refrigerant emissions Why is it necessary to ensure that service port caps containing good seals are installed? - answers To minimize refrigerant loss Which of the following is NOT a factor in how much refrigerant can be recovered from an A/C system? - answers The age of the vehicle
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