EPA 608 UNIVERSAL EXAM 2023-2024 ACTUAL EXAM
ALL 160 QUESTIONS AND CORRECT DETAILED
ANSWERS WITH RATIONALES (VERIFIED ANSWERS )
|ALREADY GRADED A+
A hermetic compressor must never be operated when: - ANSWER- C)
there is a dehydration vacuum in the system.
"Self-contained" recovery devices: - ANSWER- B) can capture liquid
and/or vapor refrigerant without the assistance of components in the air- conditioning or refrigeration equipment.
Systems charged with R-410A should be leak checked with: -
ANSWER- C) pressurized nitrogen.
R-410A is not a typical blended refrigerant because: - ANSWER- D) All
of the above are true
A ternary refrigerant blend is a ____ part mixture. - ANSWER- B) three- part
In a refrigeration system, high pressure vapor is converted to high
pressure liquid in the: - ANSWER- D) condenser
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Which of the following is an approved "drop-in" service replacement for R-12? - ANSWER- D) According to the EPA there are no "drop-in" replacements
The proper method of discarding a disposable refrigerant cylinder is to: -
ANSWER- B) assure that all refrigerant is recovered and that the cylinder is rendered useless, then recycle the metal.
CFC refrigerants are so named because they contain the elements: -
ANSWER- A) chlorine, fluorine, carbon
Before you dispose of any system containing a refrigerant, you must: -
ANSWER- A) recover the refrigerant.
According to EPA regulations, which of the following procedures is not an approved technique for system cleanup after a burnout? - ANSWER-
- flushing with liquid refrigerant to clean tubing
When using nitrogen to pressurize a system, you should always: -
ANSWER- B) Charge through a pressure regulator.
What effects can ozone depletion have on the environment? - ANSWER- D) all of the above
Non-Azeotropic refrigerants leak from a system: - ANSWER- B) in
uneven amounts due to different vapor pressures. 2 / 3
An example of an HCFC refrigerant is: - ANSWER- B) R-22
Which chemicals are controlled by the Montreal Protocol? - ANSWER-
- all of the above
Systems charged with R-134a should be leak checked with: - ANSWER-
- pressurized nitrogen.
When evacuating a system, the hoses should be: - ANSWER- D) equal
to or larger than vacuum pump inlet connection.
It has been illegal to vent substitutes for CFC and HCFC refrigerants
since: - ANSWER- D) November 1995.
Never use oxygen or compressed air to pressurize a system because: -
ANSWER- A) when mixed with compressor oil or some refrigerants, it could explode.
Refrigerant cylinders should always be: - ANSWER- D) all of the above
Even though R-22 is considered non-toxic, it: - ANSWER- B) can cause
asphyxia.
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