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
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 2
2
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 3
3
In a heat pump system, what is the purpose of the reversing valve?
Question 4
4
Which federal regulation requires HVAC technicians to be certified before purchasing or handling refrigerants with a global warming potential above 150?
Question 5
5
What color is the standard low-pressure side (suction) hose on a refrigerant manifold gauge set?
Question 6
6
Which component in a split-system air conditioner is typically located outdoors?
Question 7
7
A compressor discharge temperature on an R-22 system reads 220 degrees F. What is the most likely cause, and what is the potential consequence if left uncorrected?
Question 8
8
On a pressure-enthalpy (Mollier) diagram for a standard vapor-compression cycle, which process represents the work input by the compressor?
Question 9
9
Which thermostat terminal is typically used to energize the air handler fan independently, such as when the occupant selects 'Fan On' on a 24-volt thermostat system?
Question 10
10
What is the primary purpose of recovering refrigerant before opening an HVAC system for repair?
Question 11
11
What is the function of the compressor in a vapor-compression refrigeration system?
Question 12
12
What does the term 'superheat' refer to in a refrigeration system?
Question 13
13
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 14
14
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 15
15
Which type of metering device delivers a fixed orifice flow determined solely by the pressure differential across it, with no moving parts?
Question 16
16
A condensing gas furnace produces liquid condensate in its secondary heat exchanger. Where should this condensate drain, and what safety device confirms proper combustion airflow before ignition?
Question 17
17
A technician performs a combustion analysis on a natural gas furnace and measures a stack temperature of 400 degrees F on a furnace rated at 80% AFUE under normal conditions. What does the elevated stack temperature suggest about actual seasonal efficiency?
Question 18
18
A gas furnace has an input rating of 100,000 BTU/hr and an AFUE of 80%. What is its approximate heating output?
Question 19
19
In the basic refrigeration cycle, which component absorbs heat from the conditioned space and causes the refrigerant to evaporate?
Question 20
20
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?
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