Hfo is - Study guides, Class notes & Summaries
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MACS 609 CERTIFICATION EXAM QUESTIONS & ANSWERS CORRECT 100%
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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 
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 
s...
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MACS Certification questions with correct answers
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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 
...
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ASE AC 609 Question and answers 2023
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ASE AC 609 Question and answers 2023Ozone Depletion Potential - correct answers chemical rating that ranges from 0.01-1.0 and that refers to the amount of ozone depletion caused by a substance compared to CFC-11 (eg HCFC-22 depletes .034 of the ozone where CFC-11 would deplete 1.0) 
 
class 1 substance - correct answers ozone depleting chemical with an ozone depletion potential greater than .2 (eg CFCs)HCFCs - correct answers Hydrochlorofluorocarbons, eg R-22 (HCFC-22) 
 
HFCs - correct...
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RCP 170 Final Competency questions with complete solutions
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What is the correct initial DIRECT MAP setting for high frequency Oscillator correct answer: 8-10cmH2O 
 
What is the correct initial FROM CV MAP setting for high frequency Oscillator correct answer: 1-2cmH2O 
 
What is the initial Delta P/Amplitude setting for HFO correct answer: Unit chest wiggle is present 
 
1 Herts = how many breaths correct answer: 60 
 
What are the HFO controls for managing oxygenation correct answer: MAP 
FiO2 
 
What is the correct HFO inspiratory time setting? co...
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EPA 608 Exam Practice Questions 1-100
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EPA 608 Exam Practice Questions 1-100EPA 608 Exam Practice Questions 1-100 
Ozone depletion is caused by _______ in HFC refrigerants. - Answer chlorine 
CFCs and HCFCs ________ making them capable capable of reaching the 
stratospheric ozone layer. - Answer do not dissolve in water or easily break down in the 
atmosphere 
According to the Rolanda-Molina theory, ________ are destroyed by each chlorine 
atom in the stratosphere. - Answer 100,000 ozone molecules 
The stratospheric ozone layer prote...
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MACS 609 Certification Practice Questions with complete solutions |Latest 2024/2025
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What should you do when replacing hoses? Make sure you have the correct type/size of tubing 
 
What does GWP stand for? Global Warming Potential 
 
CO2 is equal to what A/C system? R-744 
 
HFO-1234yf systems are acceptable in what kinds of vehicles? 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? Heavy-duty trucks, refrigerated transport, and of...
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(Answered) EPA SECTION 608 CORE (2021-2022 revision)
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EPA SECTION 608 CORE (2021-2022 revision) 
A disposable cylinder should be reduced to what pressure before scrapping? 
a. 0 psig 
b. 20 psig 
c. 50 psig 
d. 80 psig 
 
A major system repair is being performed on a R-22 appliance. What CANNOT be done to recharge the appliance? 
a. Add R-22 after the repair is complete. 
b. Retrofit the unit to R-407C. 
c. Use recovered or recycled R-22 from the same 
owner. 
d. Top off the unit with R-410a. 
A refillable cylinder must not be filled above what ...
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EPA 608 EXAM PRACTICE QUESTIONS 1-100
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Ozone depletion is caused by _______ in HFC refrigerants. - Answer-chlorine 
 
CFCs and HCFCs ________ making them capable capable of reaching the stratospheric ozone layer. - Answer-do not dissolve in water or easily break down in the atmosphere 
 
According to the Rolanda-Molina theory, ________ are destroyed by each chlorine atom in the stratosphere. - Answer-100,000 ozone molecules 
 
The stratospheric ozone layer protects us from _______. - Answer-ultraviolet radiation from the sun 
 
Which...
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EPA 608 CERTIFICATION LATEST ACTUAL EXAM 2024 VERSION 2 WITH 200 QUESTIONS AND CORRECT ANSWERS (100% CORRECT VERIFIED ANSWERS)
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EPA 608 CERTIFICATION LATEST ACTUAL EXAM 2024 VERSION 2 WITH 200 QUESTIONS AND CORRECT ANSWERS (100% CORRECT VERIFIED ANSWERS) 
Recovery equipment is certified by _________. - ANSWER-an EPA-approved 
laboratory 
The EPA defines this as maintenance, service, or repair that involves removal of 
the appliances compressor, condenser, evaporator, or auxiliary heat exchanger coil 
- ANSWER-Major maintenance 
When recovering refrigerant from small appliances, you must recover _________. 
- ANSWE...
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EPA 608 Exam 2| Study Questions Correctly Answered!!
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Why are flammable HFO refrigerants classified as A2L and not A2? - ANSWER They have low 
flammability, being less flammable than HC refrigerants. 
Which of the following statements is true? - ANSWER Propane cylinders for grilling contains 
impurities that refrigerant-grade propane does not have. 
Over-evacuation of a system can ________ - ANSWER never occur; you can never pull too much 
air or other impurities from a system
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