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WorksheetsCore Test Sample Questions
Total questions: 90
Worksheet time: 45mins
As of what date did it become unlawful to release Class 1 and Class II refrigerants to the atmosphere?
July 1, 1992
July 1, 1993
November 14, 1994
January 1, 1996
What is the ozone layer and why is it important to us on Earth?
Thin layer of R-22 in the atmosphere that filters UV
Protective shield for Earth from the sun's harmful ultraviolent (UV) rays in the stratosphere layer that extends about 6 to 30 miles above earth
Thin layer of CFC and HCFC in the atmosphere that filters UV
Protective layer that shields UV in the Troposphere
The atom found in CFC and HCFC refrigerants that destroys ozone in the stratosphere is?
Fluorine
Carbon
Hydrogen
Chlorine
What is an ozone molecule made of?
Refrigerant
Ammonia
Three oxygen atoms (O3)
Oxygen and ammonia
Which refrigerant is a CFC?
R-134A
R-123
R-22
R-12
What is the name of the atom that attacks ozone molecules?
CFC atoms
HCFC atoms
Chlorine and bromine atoms emitted into the atmosphere
a and b
Which refrigerant is a HFC?
R-134A
R-123
R-22
R-12
Describe how one Chlorine atom can destroy 100,000 ozone molecules.
Chlorine releases one of the oxygen atoms and forms two O2 oxygen molecules, leaving the chlorine molecule free to attack another ozone molecule and repeat the process
Chlorine locks up the ozone molecule and then and then goes after another
Chlorine converts the ozone to bromine and then attacks more ozone molecules
Chlorine can bleach 100,000 ozone molecules before it weakens
Which refrigerant contains no chlorine?
R-134A
R-123
R-22
R-12
Name the refrigerant types that belong to CFCs, HCFCs, and HFCs
CFC R-11, R-12, R-500
HCFC R-22, R-123
HFC R-134a
All the above are correct
The rule of thumb for refilling approved cylinders is a maximum of --- percent liquid?
60%
79%
80%
90%
What do the letters in "HCFC" stand for?
High Carbon Fluorine Chlorine
hydrochlorofluorocarbons
Harmful Carbon Fluorine Chlorine
highchlorinefluorocarbon
To recover refrigerant is to?
Remove a refrigerant in any condition from a system in either an active or passive manner, and store it in an external container without necessarily testing or processing
Reduce contaminants in used refrigerant by oil separation through filter dryers
Reprocess refrigerant to new product specifications
Remove refrigerant and change ownership
What is ODP?
Oxygen Destruction Properties
Ozone Depletion Potential
Ozone Destruction Properties
Oxygen Depletion Potential
R-134-A is a "drop in" refrigerant for?
R-12
R-22
R-11
R-134A is not a drop-in refrigerant
Name some of the health and environmental effects of ozone depletion.
Increased Temperature of the Earth
Increased Cases of Skin Cancer
Increased numbers of Cataracts in the eyes
All of the above
The condition and state of the refrigerant leaving a receiver is?
Subcooled liquid
Subcooled vapor
Superheated vapor
Superheated liquid
What evidence do we have that CFCs and HCFCs are depleting the ozone?
The rise in the amount of chlorine measured in the stratosphere over the past two decades matches the rise in the amount of fluorine
The rise in the amount of chlorine measured in the stratosphere over the past two decades matches the rise in CFC emissions over the same period
Samples of air taken from the stratosphere over erupting volcanoes show that volcanoes contribute a small quantity of chlorine to the stratosphere compared to CFCs
All of the above
The component of an air conditioning system that changes a low pressure vapor to a high pressure vapor is the?
Condenser
Metering device
Evaporator
Compressor
What characteristics make it easy for CFCs to reach the stratosphere and how do they get there?
CFCs are lighter than air atoms and rise onto the Stratosphere
CFCs will not dissolve in water or break down into compounds that dissolve in water. Wind moves them into the Stratosphere
Heating of the CFCs makes them lighter than air
a and c
Why do we now use R-134a refrigerant?
It costs less
HFCs do not contain any chlorine
It is a drop in replacement for R-22
It is a drop in replacement for R-11
What is the purpose of the CAA?
Regulate California Air Quality
Clean the air in the US
Limit how much of a pollutant can be in the air in the US
Regulate Civil Aeronautics
What three things is the CAA doing to control chlorofluorocarbon emissions?
Set dates to phase out CFC's and HCFC's
Prohibit venting of CFC and HCFC
Require the EPA to set standards for recovery of refrigerants prior to appliance disposal
All of the above
What can states do in addition to the CAA?
Enforce standards more strict than the CAA laws
Nothing
States can create their own laws
All of the above
What three things can happen if you violate the CAA?
Fine up to $27,500 per day, per violation
May lose your certification to handle refrigerants
May need to appear in US Federal Court for the charges
All of the above
What incentive do the others have to turn you in for violating the CAA?
An award of up to $10,000 is offered by the EPA
An award of up to $100,00 is offered by the EPA
An award of up to $1,000 is offered by the EPA
None of the above
Who can purchase refrigerants and what size cylinders can be purchased?
Only certified technicians may purchase refrigerants as of November 14, 1994
The smallest cylinder a 608 certified technician may purchase is 20 lbs
A certified technician can purchase HCFC
All of the above
What is the Montreal Protocol?
Treaty between Canada and the US to limit use of refrigerants
Treaty among nations designated to protect the stratospheric ozone layer
Method to clean the air developed in Montreal
Carbon regulation
What chemicals does the Montreal Protocol control?
chlorofluorocarbons (CFCs), halons
carbon tetrachloride
methyl chloroform
All of the above
When was the CFC phase out date?
November 31, 2003
December 31, 1995
November 15, 1990
November 15, 1993
Where do CFC refrigerants come from for equipment servicing of older systems?
DuPont
Government warehouse
Recovery and recycling
Imported from South America
What must be done before scrapping a refrigerant container?
Release the refrigerant
Recover to (0 psig) or lower and rendered useless
Punch a hole in the container
Add compressed air
What must be done before disposing of an appliance containing CFCs or HCFCs?
Identify refrigerant by attaching DOE tag
Identify refrigerant by attaching CAA tag
Identify refrigerant by attaching EPA tag
Refrigerant must be recovered
Who is responsible for removing refrigerants from a system that is being disposed of?
HVACR tech
EPA
Original owner
Final person in the disposal chain
Are there "drop in" replacements for R-12 systems and if not, why?
There is no "drop in" replacement gas for R-12
New refrigerants are incompatible with the oils and lubricants used in R-12
134A uses a different oil than R-12
All of the above
What type of oil is used in R-134a and what oils will mix with it?
Ester based oils
Ester based oils do not mix with other oils
Synthetic alkylbenzene lubricant
a and b
(Ester based oils and Ester based oils do not mix with other oils)
Will the gases in a ternary blend leak at the same rate and why or why not?
They leak at different rates because they retain their different vapor pressures
They leak at the same rate. A leak is a leak
Ternary blends have the same vapor pressure
All of the above
What does a compressor compress?
Liquid refrigerant
Hot vapor
High pressure vapor
Low pressure, low temperature vapor
Explains how cooling of a space occurs in a refrigeration cycle
The indoor air is cooled
Heat is removed from inside the building and is deposited outside the building
Liquid refrigerant absorbs the heat and transfer it to the exterior
Cold liquid refrigerant cools and the indoor air
Will refrigerant migrate to the crank case in a compressor?
Refrigerant seeks the lowest point in the system, the compressor crankcase
Refrigerant vaporizes and does not collect tin the compressor
Oil migrates to the compressor crankcase
Refrigerant will migrate towards the compressor crank case while the oil will not
What color is the compound gauge and what does the compound gauge measure?
Blue and measures low pressure (psig) and vacuum (inches Hg)
Red and measures head pressure
Yellow and measures vacuum
Green and measures temperature and pressure
What color is the high pressure gauge?
Blue and measures high pressure
Red and measures the high side (discharge) pressure
Red and measures low side pressure
Yellow and measures high pressure
What are three things the center hose is used for and what color is it usually?
Red, high pressure, low pressure and vacuum
Yellow hose and can be connected to a recovery device, evacuation vacuum pump, or charging device
Blue, low pressure, vacuum and recovery
Green, recovery, vacuum, low and high pressure
What things should you look for in equipment and systems to help limit refrigerant emissions?
Equipment used is approved by the EPA
Leak check, repairing leaks
Making sure that all fittings are tight during service and recovery
All of the above
What is the most effective method for checking for small leaks?
Leak noise
Refrigerant dye
Pressurize with nitrogen
Halide torch
How can you test a system for leaks
Evacuate the system and pull a vacuum on it
Use a hydrostatic test
Pressurize with oxygen
Use water pressure
What should you look for if a compressor burns out?
Frayed wires
Check paint on compressor body
Strong smell in refrigerant
Melted tubing
What will need to happen if the oil has been contaminated by a burnout?
Triple evacuate the system
Install a permanent filter-drier
Conduct a deep vacuum before recharging
All of the above
How is recovery different from recycling?
Recycle is to clean refrigerant for immediate reuse
Recover is to remove refrigerant in any condition from a system and store it in an external container
There is no difference
a and b
(Recycle is to clean refrigerant for immediate reuse, and recover is to remove refrigerant in any condition from a system and store it in an external container.)
How is recycling different from reclaiming?
Recycling must be performed by a recycling plant
Recycle is to clean
Reclaim is to process refrigerant to the level of new product specifications
b and c
(Recycle is to clean, and reclaim is to process refrigerant to the level of new product specifications.)
Name reasons recovery is important?
To have adequate supplies of refrigerant for service after production bans
Prevent venting to the atmosphere
Prevent stratospheric ozone depletion
All of the above
What standards must refrigerant recovery equipment meet?
Certified and labeled by an EPA approved equipment manufacturer
None
CAA approval
DOT standards and labeling
What are types of recovery equipment used?
System dependent
Self-contained
Container less
a and b
(system dependent and self-contained)
What should you tell a consumer who complains about the added cost and time of recovering refrigerant?
Recovery is the law
Recovery is necessary to protect human health and the environment
All professional service personnel and duty bound to follow the law and protect the environment
All of the above
How should you handle recovery of a system that has mixed refrigerants?
Recover into a separate tank
Vent the refrigerant
Call the EPA
Call the police
After recovery, what are nitrogen and a filter drier used for?
Dry the system
Filter dryer is used to clean the nitrogen before removal
Flush debris and trap any debris
All of the above
What are the variables that affect the recovery rate?
Size of refrigerant system and recovery equipment
Size of suction hose
Temperatures
All of the above
Why is it important to have faster recovery?
Taking longer increases chance of emissions of the refrigerants to the atmosphere
Faster recovery saves energy
Faster recovery removes oil
All of the above
If you smell a strong odor during recovery, what is most likely the problem?
Compressor has burned out
Sour gas
Pressure is too high
Recovery machine is overloaded
Why is it necessary to dehydrate a refrigerant system?
Remove water from hydrostatic pressure test
Remove debris from the system
Remove ice contaminates
Remove water and water vapor contaminating system
What happens if moisture is left in an opening refrigeration system?
Freezes up
Creates highly corrosive and toxic acids
Increases head pressure
Reduces head pressure
What must be done before starting evacuation?
Install nitrogen
Install dryer
Recover all refrigerant
Install site glass
What are the four factors that affect the evacuation time?
Size of equipment being evacuated
Ambient temperature, Amount of moisture
Capacity of vacuum pump and suction line
All of the above
Can you increase the temperature of a refrigeration system for evacuation and if so, what purpose does it have?
Yes. Decrease the evacuation time by increasing pressure
No. it increases time by increasing pressure
No. Creates danger of explosion
None of the above
How long and what diameter should the piping connection to the vacuum pump be?
3 feet and 3/8"
2.5 feet and 3/8"
2 feet and 3/8"
As short in length as possible and as wide in diameter as possible
How big should the vacuum hoses be in relation to the pump intake connection?
One size larger than pump intake connection
Equal to or larger than the pump intake connection
One and a half size larger than pump intake connection
None of the above
For accurate vacuum readings, where should the vacuum gauge be located?
Close to the vacuum pump
Between the vacuum pump and unit
As far as possible from the vacuum pump
On the vacuum pump
When should the measurement of vacuum for a system be done and how do we know when dehydration is complete?
With the system isolated and vacuum pump turned on. Dehydration is considered complete when the vacuum gauge shows that have reached and held the required finished vacuum
With the system open and vacuum pump turned off. Dehydration is considered complete when the vacuum gauge shows that have reached and held the required finished vacuum
With the system isolated and vacuum pump turned off. Dehydration is considered complete when the vacuum gauge shows that have reached and held the required finished vacuum for one minute
With system isolated and vacuum pump turned off. Dehydration is considered complete when the vacuum gauge shows that have reached and held the required finished vacuum
What are the risks of inhaling (breathing in) refrigerants?
Refrigerants can be deadly if inhaled or allowed to be heated
Refrigerants inert and harmless if inhaled
Refrigerants are only dangerous if heated
Refrigerants can be safe if heated
What is the leading cause of refrigeration accidents leading to death?
Phosgene gas inhalation
Oxygen deprivation
Freezing to death
Electrocution
What personal protective equipment should you wear when handling refrigerants?
Safety glasses
Butyl-lined protective gloves
Safety shoes
All of the above
What are the requirements under ASHRAE standard 15-1994?
Requires a refrigerant sensor that will sound an alarm and automatically start a ventilation system in occupied equipment rooms where refrigerant (regardless of refrigerant type) from a leak will concentrate
Requires a refrigerant sensor that will sound an alarm and automatically start a ventilation system in occupied equipment rooms where R-123 form a leak will concentrate
Requires a refrigerant senor that will sound an alarm and automatically start a ventilation system in occupied equipment rooms where R-11 from a leak will concentrate
Requires a refrigerant senor that will sound an alarm and automatically start a ventilation system in occupied equipment rooms where R-12 from a leak will concentrate
Under what conditions will alarm and ventilation sound under ASHRAE standard 15-1994?
The alarm will sound before the TLV-TWA- (Threshold Limit Value - Time weighted Average) is exceeded (oxygen deprivation level)
The alarm will sound after the TLV-TWA (Threshold Limit Value - Time weighted Average) is exceeded (oxygen deprivation level)
The alarm will sound before when any leak is detected
The alarm will sound before when any leak in excess of 100 PPM is detected
What is the safest rating of a refrigerant according to the ASHRAE scale?
A - 1 is considering the safest refrigerant while B - 3 is the least safe
B - 1 is considered the safest refrigerant while A - 3 is the least safe
B - 3 considered the safest refrigerant while A - 1 is the least safe
None of the above
Why should oxygen or compressed air never be used to test leak a system?
Oxygen or compressed air, when mixed with refrigerants, can cause an explosion
Oxygen or compressed air contain moisture and will contaminated the system
Oxygen or compressed air can't be detected by leak checking tools
None of the above
When using nitrogen to charge a system, what piece of equipment should it be charged through and where should a relief valve be located?
Charge through a refrigeration manifold with a relief valve on the nitrogen cylinder
Charge through a pressure regulator (make sure the nitrogen cylinder has a regulator on it) and insert a relief valve downstream line from the pressure regulator
Install a relief valve prior to the pressure regulator
None of the above
Where can you find the appropriate test pressure for a system?
ARI directory
Data plate on the low-side pressure valve
Manufactures certified test data
None of the above
What are the two conditions to be aware of in observing relief valves?
NOT to be installed in series
Be replaced if corrosion build-up is found within the body of a relief valve
a and b
(NOT to be installed in series, and be replaced if corrosion build up is found within the body of a relief valve.)
None of the above
What can happen to refrigerants if they are exposed to direct flame or other excessive heat?
Change into toxic materials like phosgene gas
Explode
a and b
All of the above
Before welding, cutting or brazing a refrigerant line, what should be done?
Read MSDS sheet
Evacuate all refrigerant
Run a constant flow of refrigerant through it while welding
None of the above
In case of a major refrigerant leak, what actions should be taken?
Stop the leak
Close any valves
Turn off any open flames
Immediately vacate and ventilate the area or use Self Contained Breathing Apparatus (SCBA)
What types of cylinders can be used for recovery and how can you visually identify them?
Nitrogen marked nitrogen
Cylinders of the appropriate color for the refrigerant being used
Cylinders marked "RECOVERY"
Yellow tops and gray bodies
How often should refillable cylinders be hydrostatically tested?
Every 5 years
Every 3 years
Every 2 years
Every year
What must be done to a cylinder (disposable or refillable) before scrapping it?
Mark the Cylinder "Not for Reuse)
Completely evacuated of all refrigerants and have a pressure of 0 psig or lower
Completely evacuated of all refrigerants and have a pressure of 10 psig or lower
Completely evacuated of all refrigerants and have a pressure of 15 psig or lower
Why shouldn't you fill cylinders above 80% of their capacity by weight?
It takes too much time to top off the tank
Overfilled cylinders may rise in internal pressure when exposed to heat, resulting in an explosion
a and b
None of the above
What can happen if cylinders are exposed to flames or excessive heat?
May cause the cylinder to explode
It may change the state of the refrigerant into a toxic material
The added pressure may cause the cylinder to leak refrigerant
All the of above
What are the ways you can control the fill levels of a refillable cylinder?
Mechanical float devices
Electronic float devices
Weight
All of the above
In what position should cylinders be shipped?
Nested in a vertical cradle
Upright position
Stacked in vertical, bundled and strapped on a pallet
All of the above
What type of DOT tag is required for shipping refrigerant cylinders?
DOT classification tag indicating it is a "2.2 non-flammable gas"
DOT classification tag indicating it is a "high pressure gas"
DOT classification tag indicating it is a "refrigerant gas"
DOT classification tag indicating it is a "liquid refrigerant"
A cylinder label must contain what type of information about the refrigerant?
Weight of refrigerant
Type and amount of refrigerant
Pressure of cylinder
None of the above
