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Science practice questions

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

Science practice test

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

What this covers

Sample questions

R-134a belongs to which family of refrigerants?

  1. Hydrofluorocarbons (HFCs)
  2. Chlorofluorocarbons (CFCs)
  3. Hydrochlorofluorocarbons (HCFCs)
  4. Hydrofluoroolefins (HFOs)
Show the answer

A. Hydrofluorocarbons (HFCs)

R-134a contains hydrogen, fluorine and carbon and no chlorine, so it is an HFC. HFO is the family of R-1234yf, which has a carbon-carbon double bond that makes it break down quickly.

Reference: EPA Section 609 training: refrigerant types

R-1234yf belongs to which family of refrigerants?

  1. Hydrofluorocarbons (HFCs)
  2. Hydrochlorofluorocarbons (HCFCs)
  3. Hydrocarbons (HCs)
  4. Hydrofluoroolefins (HFOs)
Show the answer

D. Hydrofluoroolefins (HFOs)

R-1234yf is an HFO: an unsaturated fluorocarbon whose double bond lets it break down in the lower atmosphere within days. It is not a hydrocarbon; hydrocarbons such as propane contain no fluorine.

Reference: EPA Section 609 training: refrigerant types

Why does R-134a have an ozone depletion potential of zero?

  1. Its molecule contains no chlorine
  2. It is heavier than air and stays low
  3. It dissolves in rain before rising
  4. Its molecule contains no fluorine
Show the answer

A. Its molecule contains no chlorine

Ozone depletion by refrigerants comes from chlorine (or bromine). R-134a has neither. It does contain fluorine, and being heavier than air does not keep a gas out of the stratosphere, since the atmosphere mixes over time.

Reference: EPA Section 609 training: ozone depletion

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