WorksheetsEPA 608 core generated practice test.
Total questions: 49
Worksheet time: 25mins
What is the primary purpose of the ozone layer?
Reflect solar radiation
Absorb oxygen from the atmosphere
Protect Earth from ultraviolet radiation
Trap greenhouse gases
CFCs are harmful because they contain which element that destroys ozone?
Hydrogen
Chlorine
Fluorine
Carbon
Which refrigerant type has the highest ozone depletion potential (ODP)?
HFCs
HFOs
CFCs
HCFCs
What is the Ozone Depletion Potential (ODP) of HFC refrigerants?
High
Moderate
Very High
None
Which refrigerant has a very high Global Warming Potential (GWP)?
R-410A
R-600a
R-290
What is the baseline gas for measuring Global Warming Potential (GWP)?
Methane
Nitrous oxide
Carbon Dioxide
Hydrogen
When CFCs reach the stratosphere, what causes them to break apart?
Gravity
Magnetic Fields
Ultraviolet Radiation
Atmospheric Pressure
How long can a single chlorine atom destroy ozone molecules in the stratosphere?
5 years
20 years
70 years
120 years
Which refrigerant classification represents "non-toxic, non-flammable" refrigerants?
B1
B3
A2L
What type of refrigerant has no chlorine content?
HFC
CFC
HCFC
None
Which international treaty addressed ozone-depleting substances?
Kyoto Protocol
Paris Agreement
Montreal Protocol
Geneva Convention
What does "recycling" refrigerant mean?
Destroying refrigerant
Cleaning refrigerant for reuse
Reclaiming refrigerant
Vending refrigerant to new owners
What is the maximum permissible fill for a recovery cylinder?
50%
60%
80%
90%
What color are recovery cylinder tops typically painted?
Red
Blue
Gray
Yellow
Which refrigerant has the highest GWP among HFCs?
R-134a
R-717
R-600a
R-290
Which refrigerant type has a temperature glide?
Pure substances
Azeotropic blends
Zeotropic blends
HFOs
What is the normal atmospheric pressure at sea level?
14.7 psia
10 psia
20 psia
7 psia
What safety device is used on recovery tanks to prevent over-pressurization?
Regulator
Burst disc
Expansion valve
Relief port
What type of oil is most often used with HFC refrigerants?
Mineral Oil
Alkylbenzene Oil
Polyester (POE) Oil
Which refrigerant is classified as a very high-pressure refrigerant?
R-22
R-410A
R-744 (CO2)
R-123
An oil sample should be taken if a system experiences which event?
Regular maintenance
Minor refrigerant top-off
Compressor burnout
Normal operation
A device that minimizes refrigerant loss during service is called a:
Manual valve
Low-loss fitting
Expansion valve
Ball valve
Refrigerant cylinders must be hydrostatically tested every:
1 year
3 years
5 years
7 years
What must you wear when handling refrigerants?
Hard hat
Safety glasses and gloves
Apron
Which of the following is a goal of the Clean Air Act?
Increase refrigerant production
Minimize accidental refrigerant releases
Promote CFC use
Lower energy costs only
What should be done before shipping used refrigerant cylinders?
Paint them blue
Fill them to 100%
Affix a Department of Transportation (DOT) tag
Put them in the freezer
Which EPA Section covers technician certification?
302
402
608
740
What kind of leak detector is most sensitive?
Ultrasonic
Halide torch
Electronic
Soap bubble
What is the primary cause of ozone depletion?
HFCs
Chlorine and bromine from refrigerants
Nitrogen
High CO2 levels
Reclamation of refrigerant is:
removing refrigerant from a system and cleaning it for reuse to meet industry standards
removing refrigerant from a system and storing it without processing
destroying refrigerant so it cannot be reused
venting refrigerant into the atmosphere
What defines a small appliance?
Contains <1 lb of refrigerant
Operates below 50 psi
Factory-sealed and ≤5 lbs of refrigerant
Portable and battery-powered
When is refrigerant venting acceptable?
When leak is under 15%
During maintenance
For de minimis releases only
When it’s a small system
What does "system-dependent" recovery mean?
Recovery without refrigerant
Depends on the system’s compressor to remove refrigerant
Needs electric power
Removes only oil
What type of refrigerant has the lowest GWP?
R-22
R-410A
R-1234yf
R-600a
Which refrigerant is flammable?
R-410A
R-290 (propane)
When must refrigerant be recovered from equipment?
Only if CFCs are present
Always, unless exempted by EPA
Never if leak is under 15%
Only for units with >100 lbs
What should be done before opening a system with a suspected leak?
Check for refrigerant type
Use nitrogen to pressurize and check for leaks
Vent the gas
Heat the compressor
What is the best method to determine if a system is leaking?
Check label
Use soap bubbles or electronic detector
Open the system
Replace the filter drier
What refrigerant is known as a natural refrigerant?
R-22
R-290 (propane)
R-410A
R-134a
Which gas is used to pressurize systems for leak checking?
Oxygen
Helium
Nitrogen
What must be used with nitrogen when pressurizing a system?
Flame torch
Regulator and relief valve
Vacuum pump
Argon backup
What happens if a cylinder is overfilled?
Explodes due to pressure
Leaks refrigerant automatically
Makes system more efficient
Nothing
Who can purchase regulated refrigerants?
Anyone
EPA-certified technicians
Retail store managers
Government employees
What type of certification is required for technicians handling refrigerants?
OSHA
EPA Section 608
DOT
CFC license
Why should refrigerant not be mixed?
Causes color change
Creates high pressure
Makes recovery/recycling difficult
Leads to energy loss
What’s the effect of non-condensables in a system?
Increased efficiency
Lower head pressure
Higher system pressure and inefficiency
Reduced refrigerant charge
What is the correct disposal method for appliances with refrigerant?
Landfill
Burn
Recover refrigerant first
Crush it directly
What refrigerant replaced CFC-12 in most vehicle applications?
R-22
R-410A
R-134a
R-290
What is the term for reprocessing refrigerant to meet new purity standards?
Reuse
Recycle
Reclaim
Purge
