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Question:
R-134a is a HFC refrigerant. HFC refrigerant will have zero ODP. However, HFC refrigerants contribute to global warming (greenhouse gases).
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During each vacuum decay test, it is observed that after the vacuum is created, the pressure of the system increases to greater than 0 psig and stops at some point, then _____.
The refrigerant could be trapped in the system
Stratosphere is located between ______ above the sea level.
10 and 30 miles
Tendency to leak of the refrigerant depends on which of the following?
Molecular weight
Lifetime of CFCs is believed to be in the range of ______.
20 to 100 years
During the evacuation of the refrigerant, the larger the diameter of the suction hoses is, the _____ the recovery rate of the refrigerant will be.
Faster
R-134a is the most common replacement for which of the following refrigerants?
R-12
The Montreal Protocol entered into force in mid ______.
1987
Asphyxia is caused due to a lack of ________.
Oxygen
______ leak detector listens for the noise of gas leakage.
Ultrasonic leak tester
It is to be ensured that the refrigerant recovery cylinder is not filled to more than _____ of its capacity.
80 percent
An azeotrope mixture does not have a temperature glide.
True
HFCs are highly stable in lower part of the atmosphere.
False
What is the responsibility of the Clean Air Act?
All the options are correct
If your recovery unit does not have a sub-cooling feature, the recovery rate will be _____.
Slower
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