answers
If the mechanic's gauges rise from a vacuum to pressure, what is required? - Answer Additional recovery
What is the only way to fully clear moisture from the A/C system? - Answer Replacing the desiccant
Pressure ______ the boiling point - Answer Raises
Vacuum _______ the boi...
MACS Certification questions with correct
answers
If the mechanic's gauges rise from a vacuum to pressure, what is required? - Answer Additional recovery
What is the only way to fully clear moisture from the A/C system? - Answer Replacing the desiccant
Pressure ______ the boiling point - Answer Raises
Vacuum _______ the boiling point - Answer Lowers
What should you do when replacing hoses? - Answer Make sure you have the correct type/size of tubing
What does GWP stand for? - Answer Global Warming Potential
CO2 is equal to what A/C system? - Answer R-744
HFO-1234yf systems are acceptable in what kinds of vehicles? - Answer Passenger cars, light-duty trucks, medium-duty passenger vehicles, heavy-duty pickup trucks, and complete heavy-duty vans
HFO-1234yf systems are not acceptable in what kinds of vehicles? - Answer Heavy-duty trucks, refrigerated transport, and off-road vehicles such as farm equipment HFO-1234yf is classified by ASHRAE as what? - Answer A2L- mildly flammable
R-744 systems operate at ___ to ___ times higher than HFC-134a and HFC-152a systems. - Answer 5 to 10
HFC-152a is ___ - Answer flammable
What are the 2 types of HFC-152a systems? - Answer Direct expansion and secondary loop type
Direct Expansion - Answer Refrigerant directly expands within the evaporator that is located inside the passenger compartment
Secondary Loop (Open Loop) - Answer A circulating non-flammable fluid replaces the evaporator which provides isolation between the flammable refrigerant
and the passenger compartment
Section 609 of the Clean Air Act gives the EPA authority to do what? - Answer Establish standards and requirements regarding the servicing of mobile A/C systems
What/who establishes standards specifically for the service of motor vehicle air conditioning systems (MVAC's)? - Answer Section 609 of the Clean Air Act
How many categories of the Section 608 Certification are there? - Answer 4 types
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