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Free EPA608 Practice Questions

10 free, exam-style EPA Section 608 Technician Certification (EPA608) practice questions with answers and explanations. No signup required. Work through them below, then take the full free EPA608 practice test to study every exam domain.

These 10 free EPA608 questions are organized by exam domain, so you can see how each part of the EPA Section 608 Technician Certification blueprint is tested. Reveal the answer and explanation under each question.

Domain 1: Core

Question 1

What is the leading cause of death in refrigeration work?

  1. Electrocution
  2. Oxygen deprivation (asphyxiation) from refrigerant
  3. Toxic poisoning
  4. Falls from heights
Show answer & explanation

Correct answer: B - Oxygen deprivation (asphyxiation) from refrigerant

Question 2

Why do refrigerants cause oxygen deprivation?

  1. They chemically destroy oxygen
  2. They are heavier than air and displace oxygen at floor level
  3. They consume oxygen when released
  4. They create a vacuum effect
Show answer & explanation

Correct answer: B - They are heavier than air and displace oxygen at floor level

Question 3

A facility manager questions why they must recover R-22 when 'HCFCs are being phased out anyway.' The most accurate response is:

  1. R-22 recovery is optional during phase-out
  2. R-22 still depletes ozone and contributes to environmental harm; recovery is mandatory regardless of phase-out status
  3. Only CFCs require recovery
  4. R-22 can be vented after 2020
Show answer & explanation

Correct answer: B - R-22 still depletes ozone and contributes to environmental harm; recovery is mandatory regardless of phase-out status

Question 4

Recovery equipment manufactured after November 15, 1993 must be:

  1. EPA-certified
  2. State-certified only
  3. Certified by manufacturer only
  4. No certification required
Show answer & explanation

Correct answer: A - EPA-certified

Question 5

What pressure rating is required for R-410A recovery cylinders?

  1. 250 psig minimum
  2. 300 psig minimum
  3. 400 psig minimum
  4. Same as any DOT cylinder
Show answer & explanation

Correct answer: C - 400 psig minimum

Question 6

Equipment uses R-404A. When charging this zeotropic blend, the technician should:

  1. Add as vapor only
  2. Add as liquid to prevent fractionation
  3. Add vapor for large amounts
  4. Mix with R-22 first
Show answer & explanation

Correct answer: B - Add as liquid to prevent fractionation

Domain 2: Type I - Small Appliances

Question 7

A freezer made in 2015 shows 4 pounds on nameplate. Compressor runs. After recovery, gauge reads 4 inches Hg vacuum and 3.5 pounds were recovered. Status?

  1. Non-compliant - must recover 3.6 pounds minimum
  2. Compliant - vacuum requirement met
  3. Non-compliant - must meet both requirements
  4. Compliant - either requirement satisfies
Show answer & explanation

Correct answer: D - Compliant - either requirement satisfies

Domain 3: Type II - High-Pressure Appliances

Question 8

A comfort cooling system with 75 pounds of R-22 loses 12 pounds over 12 months with 1 pound recovered. Is repair required?

  1. No - below 50-pound threshold
  2. No - 14.7% is below 15%
  3. Yes - 16% exceeds 10% threshold
  4. Yes - any leak requires repair
Show answer & explanation

Correct answer: C - Yes - 16% exceeds 10% threshold

Domain 4: Type III - Low-Pressure Appliances

Question 9

A chemical plant's process cooling system operates at 26 inches Hg vacuum in the evaporator. A small leak develops. What happens?

  1. Refrigerant leaks out slowly
  2. Air and moisture are drawn into the system
  3. System pressure increases
  4. Nothing significant
Show answer & explanation

Correct answer: B - Air and moisture are drawn into the system

Question 10

Which represents a deeper vacuum: 25 inches Hg vacuum or 25 mm Hg absolute?

  1. 25 inches Hg vacuum
  2. 25 mm Hg absolute
  3. Both are the same
  4. Neither is a vacuum
Show answer & explanation

Correct answer: B - 25 mm Hg absolute

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