EPA 608 UNIVERSAL EXAM -

EPA 608 UNIVERSAL 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-

• 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

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

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EPA 608 UNIVERSAL EXAM -

ALL 160 QUESTIONS AND CORRECT DETAILED

ANSWERS WITH RATIONALES (VERIFIED ANSWERS)

|ALREADY GRADED A+

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-B) 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.

An example of an HCFC refrigerant is: - ANSWER-B) R-22 2 / 3

EPA 608 UNIVERSAL EXAM -

ALL 160 QUESTIONS AND CORRECT DETAILED

ANSWERS WITH RATIONALES (VERIFIED ANSWERS)

|ALREADY GRADED A+

Which chemicals are controlled by the Montreal Protocol? - ANSWER-D) all of the above

Systems charged with R-134a should be leak checked with: -

ANSWER-D) 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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