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Refrigerants practice questions

29 questions from the epa 609 (vehicle a/c) practice test.

Refrigerants practice test

10 questions, graded as you go, with the reason for every answer. No sign-up.

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Sample questions

What is the ASHRAE safety classification of R-1234yf?

  1. A1
  2. A2L
  3. A3
  4. B2L
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B. A2L

R-1234yf is A2L: lower toxicity (A) and lower flammability (2L). A1 is non-flammable, like R-134a, and A3 is highly flammable, like propane.

Reference: ASHRAE Standard 34

What is the ASHRAE safety classification of R-134a?

  1. A1
  2. A2L
  3. A2
  4. B1
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A. A1

R-134a is A1: lower toxicity and no flame propagation at standard test conditions. A2L is the class of R-1234yf, and A2 is the class of R-152a.

Reference: ASHRAE Standard 34

In the safety classification A2L, what does the '2L' tell you about the refrigerant?

  1. It is non-flammable under all conditions
  2. It is as flammable as propane or butane
  3. It is flammable but burns slowly
  4. It is toxic at low concentrations
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C. It is flammable but burns slowly

Class 2L refrigerants are mildly flammable with a low burning velocity. The letter A or B, not the number, describes toxicity; class 3 is the highly flammable group that includes propane.

Reference: ASHRAE Standard 34

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