WorksheetsEPA Review -- CORE pt 4 (English)
Total questions: 30
Worksheet time: 15mins
How can non-condensable gases affect the system's components?
They enhance the components' efficiency.
They have no effect on the components.
They can cause the components to fail prematurely.
They extend the components' lifespan.
What chemical reactions can non-condensable gases cause in the system?
Produce acids and reduce oil lubricity.
Increase oil lubricity and reduce acids.
Neutralize acids and improve oil quality.
Prevent moisture from entering the system.
Why is it important to know if non-condensable gases exist in the recovery cylinder?
To ensure the refrigerant is not contaminated.
To increase the system's efficiency.
To reduce the system's pressure.
To enhance the refrigerant's cooling capacity.
Why is it important to pressurize the system with dry nitrogen before disconnecting service gauges?
To cool down the system
To prevent air and moisture from entering
To increase the system's efficiency
To reduce the system's pressure
What can happen if moisture is present in a refrigeration system?
It accelerates the formation of acid
It improves system efficiency
It reduces the need for maintenance
It increases the system's lifespan
What is a potential consequence of a burnout in a compressor?
Increased system efficiency
High acid levels in the system
Reduced system pressure
Improved refrigerant flow
What should be done if a system cannot be sealed?
Leave it open
Tape the exposed ends
Increase the system pressure
Add more refrigerant
Which refrigerant is mentioned as having a very low allowable exposure limit of 30 ppm?
HCFC-123
CFC-11
HCFC-22
HFC-134a
What can excessive heat cause refrigerants to do?
Decompose into toxic vapors
Freeze
Evaporate harmlessly
Solidify
What is the flammability classification for refrigerants with a lower flammability limit of more than 0.10 kg/m3?
2
1
3
4
What is the recommended number of air changes per hour when working with refrigerants?
One
Two
Three
Four
What could be a reason for measuring a pressure lower than indicated on the pressure-temperature chart?
The temperature or pressure readings are incorrect due to unstable conditions.
The refrigerant is pure and uncontaminated.
The cylinder temperature is too high.
The pressure gauge is new.
What should be done before recharging a refrigeration system?
Add more refrigerant.
Evacuate the system.
Increase the system's temperature.
Decrease the system's pressure.
What is the ASHRAE safety classification for a refrigerant with higher flammability and lower toxicity?
A1
A2
A3
B3
What is the main environmental benefit of HFO refrigerants?
They are non-flammable
They are environmentally friendly
They are cheaper
They are more toxic
Which refrigerant is classified as A2 according to ASHRAE safety classifications?
R-142b
R-11
R-30
R-1140
What is the primary reason HFO refrigerants are less flammable than HC refrigerants?
They contain fluorine atoms
They are synthetic
They are more toxic
They are heavier
What is the ASHRAE classification for a refrigerant with no flame propagation and higher toxicity?
A1
A2
B1
B2
Which of the following is a characteristic of hydrofluoroolefin (HFO) refrigerants?
They are highly toxic
They are unsaturated HFCs
They are inorganic
They are metal alloys
Which refrigerant is classified as A1 and is non-flammable according to ASHRAE safety classifications?
R-11
R-290
R-50
R-1140
Why should you weigh a cylinder?
To ensure it is empty
To check its size
To balance it
To label it correctly
What is the purpose of labeling appliances with flammable refrigerants?
To enhance the aesthetic appeal of the appliance
To provide a warning of the presence of a flammable refrigerant
To increase the appliance's efficiency
To reduce the appliance's cost
What must a service port or access valve have if installed after manufacture?
A blue marking
The red flammable marking
A green marking
A yellow marking
What should you avoid doing when the refrigerant is in the unit?
Painting the unit
Cutting or welding any refrigerant line
Cleaning the unit
Moving the unit
What should always be refitted when the cylinder isn’t in use?
The valve cap
The label
The handle
The base
Which refrigerant is stored in a tan tank?
R-116
R-125
R-113
R-22
Which tank color corresponds to the refrigerant R-401B?
Coral
Mustard
Orange
Pink
Identify the tank color for the refrigerant R-500.
Yellow
Light Purple
Sky Blue
Coral
What type of personal protective equipment should be worn to guard against liquid refrigerant?
Splash-proof safety glasses
Earplugs
Hard hats
Respirators
What is the requirement for the red marking if a service port or refrigerant access valve is added?
Extend the red mark at least 2 inches in both directions
Extend the red mark at least 1 inch in both directions
Extend the red mark at least 3 inches in both directions
Extend the red mark at least 4 inches in both directions
