Practice test

Free HVAC Practice Test

Take our free HVAC practice test with 20 questions covering EPA 608, refrigeration, and heating systems. Instant scoring with answer explanations.

These questions are for study practice only and are not official exam questions.

Question 1

1

Which federal regulation requires HVAC technicians to be certified before purchasing or handling refrigerants with a global warming potential above 150?

Question 2

2

What color is the standard low-pressure side (suction) hose on a refrigerant manifold gauge set?

Question 3

3

Which refrigerant is classified as an HFC and has zero ozone depletion potential (ODP)?

Question 4

4

What is the primary purpose of recovering refrigerant before opening an HVAC system for repair?

Question 5

5

A technician finds a system leaking refrigerant. Under EPA Section 608, what is the maximum allowable annual leak rate for a commercial refrigeration system holding more than 50 pounds of refrigerant before repair is required?

Question 6

6

R-22 is classified under which refrigerant family, and why is it being phased out?

Question 7

7

Which EPA 608 certification type covers technicians who service small appliances containing five pounds or less of refrigerant, such as household refrigerators and window AC units?

Question 8

8

During refrigerant recovery from a system with a hermetic compressor larger than 200 horsepower, what is the required vacuum level (inches of mercury) before the system is considered recovered, assuming the recovery machine was manufactured after November 15, 1993?

Question 9

9

What does the term 'recycling' mean in the context of refrigerant handling under EPA 608?

Question 10

10

A refrigerant cylinder is painted green. Which refrigerant does this color coding indicate?

Question 11

11

A technician recovers refrigerant from a large commercial chiller using R-123. After recovery, what vacuum level must be achieved, and which EPA 608 type covers this equipment?

Question 12

12

A refrigerant blend has a GWP of approximately 2,088 and an ODP of 0. Which blend best matches these characteristics, and what does its high GWP imply for future US regulations?

Question 13

13

During a standing pressure test using nitrogen, a technician notices the system pressure rises 5 psig over two hours with no refrigerant added. What is the most likely explanation?

Question 14

14

In the basic refrigeration cycle, which component absorbs heat from the conditioned space and causes the refrigerant to evaporate?

Question 15

15

What is the function of the compressor in a vapor-compression refrigeration system?

Question 16

16

What does the term 'superheat' refer to in a refrigeration system?

Question 17

17

Which component in a split-system air conditioner is typically located outdoors?

Question 18

18

A technician measures suction pressure on an R-410A system at 118 psig. The pressure-temperature chart shows a saturation temperature of 40 degrees F at that pressure. The suction line temperature at the evaporator outlet reads 50 degrees F. What is the system superheat?

Question 19

19

A technician measures total system superheat on an R-22 system and finds it is 35 degrees F. What condition does this most likely indicate?

Question 20

20

What is subcooling, and why is it measured on the high side of a refrigeration system?

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