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WorksheetsEPA 608 - CORE PRACTICE
Total questions: 69
Worksheet time: 35mins
Which exams does a technician need to pass in order to obtain a universal certification?
Core +Type II
Type I + Type II + Type III
Core + Type I + Type II +Type III
Core + Type I
A technician with a Type III certification can repair what type of appliances?
Small appliances such as window AC units
High pressure appliances such as heat pumps
Low pressure appliances such as chillers
Can you work under someone else's certification?
NO
YES
A technician with a Type II certification can repair what type of appliances?
Small appliances such as window AC units
Low pressure appliances such as chillers
High pressure appliances such as heat pumps
ODP stands for Ozone Depletion Potential which measures a substance's ability to:
Destroy ozone molecules in the stratosphere.
Destroy chlorine monoxide in the atmosphere.
Destroy chlorine atoms.
The ozone molecule is made up of:
3 oxygen atoms.
2 oxygen atoms.
4 oxygen atoms.
The purpose of the stratospheric ozone layer is to protect the earth from:
Space debris.
Asteroids.
The sun's ultraviolet radiation.
True or False: Chlorine is the part of a refrigerant that causes ozone depletion.
TRUE
FALSE
When a chlorine atom takes 1 of an ozone molecule's oxygen atoms what compound is formed?
Fluorine
Carbon dioxide
Hydrogen
Chlorine monoxide
What type of refrigerant is R-12?
CFC
HFO
HFC
HCFC
What do CFCs contain?
Hydrogen, fluorine, and carbon
Hydrogen, chlorine, and fluorine
Chlorine, fluorine, and carbon
Which type of refrigerant has the highest ODP?
CFCs
HCFCs
HFOs
HFCs
Which refrigerant is an example of an HFC?
R-22
R-11
R-134a
R-12
Which refrigerants do not contain chlorine and have zero ODP?
HFCs and HFOs
CFCs and HCFCs
What two points in the refrigeration system divides the low-pressure side and the high-pressure side?
The compressor and the evaporator
The compressor and the liquid receiver
The compressor and the metering device
The condenser and the evaporator
What state does the refrigerant enter the compressor as?
A high-pressure, high-temperature superheated vapor
A high-pressure, low-temperature liquid
A high-pressure subcooled liquid
A low-pressure, low-temperature superheated vapor
The blue gauge on a gauge manifold set is the:
Evacuation gauge
Low-pressure compound gauge
Recovery gauge
High pressure gauge
Where in the refrigeration cycle is the pressure reduced, causing a small percentage of the refrigerant to flash to a vapor (flash-gas)?
The metering device
The liquid receiver
The compressor
The condenser
What component follows the condenser on a refrigeration system with a thermostatic expansion valve?
accumulator
dip tube
liquid receiver
oil separator
What component may be installed in the suction line, before the compressor, to prevent liquid refrigerant from entering the compressor?
accumulator
head pressure control valve
liquid receiver
oil separator
Never___________ a discharge service valve when a system is in operation.
back seat
front seat
take the service cap off
What must be done prior to removing gauge hoses from the service valves?
mid position service valves
front seat service valves
back seat service valves
What is a de-minimis release of refrigerant?
a minor release of refrigerant such as removing hoses
refrigerant released through a purge unit as a result of adding nitrogen to a charged system
refrigerant released from an old refrigerant cylinder
a major release of refrigerant that must be reported
The center port and hose of a gauge manifold is used for which of the following?
charging
all answers are correct
recovery
evacuation
What is the maximum penalty for violating the Clean Air Act?
$44,539 per day, per violation
$4000 per day, per violation
$4400 per violation
$400 per day
What international agreement addresses the protection of stratospheric ozone by phasing out production of ozone-depleting substances?
Montreal Protocol
Significant New Alternatives Policy (SNAP)
Clean Air Act
AHRI Standards
Which of the following constitutes a violation of Section 608 of the Clean Air Act?
Using recovery equipment that meets EPA standards
Knowingly releasing or venting ozone depleting substances and substitute refrigerants
Having a recovery device that is equipped with low loss fittings
Keeping accurate records
What year will all HCFCs be phased out by?
2040
2025
2050
2030
What was the first group of refrigerants to get phased out under the Montreal Protocol?
HCs
CFCs
HFOs
HFCs
What is the purpose of the Significant New Alternatives Policy (SNAP) program?
To recover appliances
To eliminate substitute refrigerants
To restrict sales
To identify, evaluate, and approve substitute refrigerants
If a substance Has not been approved by the SNAP program can it be used to retrofit an existing system?
NO
YES
CFCs and HCFCs can be:
Used to service a system that contains those refrigerants
Used in new equipment
Easily purchased
Which of the following is a good 'drop-in' replacement?
There are no 'drop-in' replacements.
R-12
R-22
R-1234yf
What type of oil found in HFCs and HFOs cannot be mixed with oils in older systems?
Alkylbenzene oils
Polyolester (POE) oils
What type of oil does an HCFC-based blend use?
Ester-based oil
POE oil
Alkylbenzene oil
HFC refrigerant blends use:
Slkylbenzene oil
Polyolester (POE) oil
Synthetic alkylbenzene oil
Which type of refrigerant blend acts like a single refrigerant with no temperature glide or fractionation?
Non-azeotropic
Zeotropic blends
Azeotropic blends
When is bubble point used?
When charging by the condenser subcooling method
When charging by the superheat method
When finding the evaporator temperature
What does fractionation mean?
It refers to the range of temperatures a blend will evaporate and condense at
The refrigerant is azeotropic
The refrigerant is in two different containers
The individual refrigerants in the blend may leak at different rates
Refrigerants that evaporate and condense at a range of temperatures at a given pressure is the definition of:
pressure ranging
blend fractionation
blend decomposition
temperature glide
When converting low side pressure to evaporator temperature, with an R400 series blend refrigerant, the technician should use which pressure value on the temperature pressure chart
bubble point
dew point
take the average of the bubble and dew point values
What is the most effective way to determine the general area of a leak?
Use a recovery unit
Use an electronic or ultrasonic leak detector
Use a vacuum pump
Nitrogen leak test
After determining the general area of a leak, what can be used to pinpoint it?
Laser
Soap bubbles
Vacuum pump
Recovery unit
What is the first issue a technician can look for when inspecting a refrigeration system known to be leaking?
Excessive condensation
Traces of oil around fittings
Dust or dirt inside the machine
Rat droppings
Which process is defined as removing refrigerant (in any condition) and storing it in an external container to be put back in the same system?
Reclaim
Recover
Recycle
Which process is defined as cleaning the refrigerant by oil separation and passing it through one or more filter-driers?
Recycle
Recover
Reclaim
Which recovery device uses an active recovery unit to draw refrigerant from the appliance?
Self contained
System dependent
Which process involves chemical analysis to determine if the refrigerant is back to new product specifications?
Recover
Reclaim
Recycle
Can all recovered refrigerants be mixed into the same container?
YES
NO
Recovery efficiency will be dependent on which of the following?
All of these
Ambient temperature
Size of the appliance
Amount of moisture
What will using long hoses during the recovery process result in?
Increased pressure drop, decreased recovery time
Decrease pressure drop, decreased recovery time
Increased pressure drop, increased recovery time, and increased emissions
Recovered refrigerant that is contaminated must be recovered into:
A tank with other types of refrigerant in it
A separate tank
The same tank as the refrigerant that isn't contaminated
What is the purpose of evacuation and dehydration?
To improve the vacuum pump
To add water and water vapor to the system
To remove non condensibles (air) and water vapor
To cause hydrofluoric acids to form
The final system vacuum measurement should be done with:
A multimeter
The vacuum pump turned on
The vacuum pump turned off
What can form if water or water vapor is left in the system?
hydrochloric and hydrofluoric acid
ester-based oil
hydrogen
hydrocarbon
How many microns should a system be evacuated to?
50,000 microns
5000 microns
900 microns
500 microns or lower
What factors have an impact on evacuation speed and efficiency?
Ambient temperature and the amount of moisture in the system
All of these
The size of the pump and pump intake pipe
The size and extent of piping and coils
A recovery cylinder should never be filled more than what percentage of its capacity by weight?
90%
80%
95%
100%
Overfilling a recovery cylinder may result in...
The transportation of too much refrigerant
An explosion
An overflow of liquid
The tank becoming too heavy
How often does a reusable container for refrigerant need to be hydrostatically tested?
every 10 years
every year
every 8 years
every 5 years
What does an approved refrigerant recovery cylinder look like?
It has a grey-colored top and a blue body.
It has a green-colored top and a yellow body.
It has a yellow-colored top and a purple body.
It has a yellow-colored top and a grey body.
How should refrigerant cylinders be transported?
On their side and strapped into something
Horizontally with a DOT classification tag
Upside down with a DOT classification tag
In an upright position with a DOT classification tag
What protective equipment should a technician wear when filling refrigerant cylinders or using recovery equipment?
Just safety glasses
Safety glasses and protective gloves
A protective outfit without gloves
Rubber surgical gloves
When checking for a leak what should a technician use to pressurize the system?
Nitrogen
Compressed air
Oxygen
How should a pressure relief valve be installed on a nitrogen line, when using more than one?
Always upside down
Never parallel, always in series to each other
Only parallel, never in series to each other
When should a technician use a pressure regulator and a relief valve?
When using nitrogen to check for leaks in a system
When using water to check for leaks in a system
When using compressed air to check for leaks in a system
When using oxygen to check for leaks in a system
What can refrigerants cause if inhaled in high concentrations?
Asphyxia (suffocation)
All of these
Heart irregularities
Unconsciousness
Death
In the event of a large release of refrigerant into a confined space, why should technicians (and everyone else) IMMEDIATELY vacate and ventilate the area?
Because refrigerant will displace oxygen, causing suffocation
Because refrigerant smells terrible
Because refrigerant causes ozone depletion
In the event of a large release of refrigerant into a confined space, what personal protective equipment (PPE) is required?
A towel
A mask designed to keep dust out
Waterproof goggles
A self-contained breathing apparatus (SCBA)
