MACS Certification Exam With 100% Correct Answers 2024
If the mechanic's gauges rise from a vacuum to pressure, what
is required? - Correct Answer-Additional recovery
What is the only way to fully clear moisture from the A/C system? - Correct Answer-Replacing the desiccant
Pressure ______ the boiling point - Correct Answer-Raises
Vacuum _______ the boiling point - Correct Answer-Lowers
What should you do when replacing hoses? - Correct Answer-
Make sure you have the correct type/size of tubing
What does GWP stand for? - Correct Answer-Global Warming Potential
CO2 is equal to what A/C system? - Correct Answer-R-744 pg. 1 professoraxe l HFO-1234yf systems are acceptable in what kinds of vehicles? - Correct 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? - Correct Answer-Heavy-duty trucks, refrigerated transport, and off-road vehicles such as farm equipment
HFO-1234yf is classified by ASHRAE as what? - Correct Answer-A2L- mildly flammable
R-744 systems operate at ___ to ___ times higher than HFC-
134a and HFC-152a systems. - Correct Answer-5 to 10
HFC-152a is ___ - Correct Answer-flammable
What are the 2 types of HFC-152a systems? - Correct Answer-
Direct expansion and secondary loop type
Direct Expansion - Correct Answer-Refrigerant directly expands within the evaporator that is located inside the passenger compartment pg. 2 professoraxe l
If the mechanic's gauges rise from a vacuum to pressure, what
is required? - Correct Answer-Additional recovery
What is the only way to fully clear moisture from the A/C system? - Correct Answer-Replacing the desiccant
Pressure ______ the boiling point - Correct Answer-Raises
Vacuum _______ the boiling point - Correct Answer-Lowers
What should you do when replacing hoses? - Correct Answer-
Make sure you have the correct type/size of tubing
What does GWP stand for? - Correct Answer-Global Warming Potential
CO2 is equal to what A/C system? - Correct Answer-R-744 pg. 1 professoraxe l HFO-1234yf systems are acceptable in what kinds of vehicles? - Correct 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? - Correct Answer-Heavy-duty trucks, refrigerated transport, and off-road vehicles such as farm equipment
HFO-1234yf is classified by ASHRAE as what? - Correct Answer-A2L- mildly flammable
R-744 systems operate at ___ to ___ times higher than HFC-
134a and HFC-152a systems. - Correct Answer-5 to 10
HFC-152a is ___ - Correct Answer-flammable
What are the 2 types of HFC-152a systems? - Correct Answer-
Direct expansion and secondary loop type
Direct Expansion - Correct Answer-Refrigerant directly expands within the evaporator that is located inside the passenger compartment pg. 2 professoraxe l
