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WorksheetsFAB-101 HW Core Pgs. 1-5
Total questions: 30
Worksheet time: 15mins
What is one of the serious health effects of stratospheric ozone depletion?
Decreased lung capacity
Increased rates of skin cancer
Higher blood pressure
Increased risk of diabetes
What is formed when a chlorine atom encounters an ozone molecule?
Chlorine dioxide
Chlorine monoxide
Chlorine trioxide
Chlorine tetroxide
What are HFCs made up of?
Hydrogen, Fluorine, and Carbon
Helium, Fluorine, and Chlorine
Hydrogen, Fluorine, and Chlorine
Helium, Fluorine, and Carbon
What happens when chlorine monoxide collides with another ozone molecule?
It forms three O2 molecules
It releases its oxygen atom, forming two O2 molecules
It forms a stable compound
It breaks down into water
What is the main difference between HFCs and CFCs regarding ozone depletion?
HFCs contain chlorine
HFCs do not contain chlorine
HFCs are more harmful to the ozone layer
HFCs are less stable
Which type of refrigerants have the lowest global warming potential compared to CFCs, HCFCs, and HFCs?
Hydrofluorocarbons (HFCs)
Chlorofluorocarbons (CFCs)
Hydrofluoroolefins (HFOs)
Hydrocarbons (HCs)
Which refrigerant is an example of a CFC?
R-134a and R-407C
R-410A and R-22
R-11 and R-12
R-290 and R-600a
What component in CFCs poses a threat to the stratospheric ozone?
Fluorine
Carbon
Chlorine
Hydrogen
What is the ASHRAE number for an HFC refrigerant example?
R-11
R-22
R-134a
R-290
What is a characteristic of azeotropic refrigerant mixtures?
They have varying boiling points
They act as a single component refrigerant
They are always binary mixtures
They have a high ozone depletion potential
Which refrigerant is known for having a high-temperature glide?
R-134a
R-22
R-407C
R-410A
What is the proper method for charging R-400 series blended refrigerants?
Charging into the low side as a vapor
Charging into the high side as a liquid
Charging into the low side as a liquid
Charging into the high side as a vapor
What is the GWP value of hydrocarbons (HCs) typically less than?
Less than 100
Greater than 50
Less than 10
Greater than 15
What is used to indicate condensing and evaporation temperatures on a pressure-temperature chart?
Boiling points
Temperature glide
Bubble and Dew Points
Saturation points
What can technicians only charge used CFC, HCFC or HFC refrigerants into?
Any appliance on rooftops, any age.
The same appliance or another owned by the same owner, any age.
New appliances less than 1 year old
Rented appliances less than 6 months old
What is the main purpose of recycling refrigerant?
To extract and clean refrigerant for reuse of only your customers
To extract and clean refrigerant for reuse of the same owner
To extract and blend refrigerants for reuse of the same owner
To extract and blend refrigerants for reuse of only your customers
What should be avoided to prevent excessive pressure drop during refrigerant recovery?
Using short and large diameter hoses between the unit and recovery machine.
Using long and small diameter hoses between the unit and recovery machine.
Using long and small diameter hoses between the tank and recovery machine.
Using short and large diameter hoses between the tank and recovery machine.
What must be guarded against during liquid refrigerant transfer between recovery unit and refrigeration system?
Trapping liquid refrigerant in the service hose
Using short hoses
Mixing refrigerants
Using large diameter hoses
What can happen if the wrong type of electronic leak detector is used with a flammable refrigerant?
It can cause a system shutdown
It can lead to an explosion and bodily injuries
It can increase refrigerant efficiency
It can reduce system pressure
What is the main reason for dehydrating a refrigeration system?
To increase refrigerant flow
To remove water and water vapor
To enhance cooling efficiency
To reduce system noise
What tool is used to measure the evacuation level of a system?
Pressure gauge
Micron gauge
Thermometer
Hygrometer
Which factor does NOT affect the speed and efficiency of evacuation?
Size of equipment being evacuated
Ambient temperature
The brand of a micron gauge
Amount of moisture in the system
When leak checking a system, what should Never be used to pressurize a system? In doing so it will cause an explosion when mixed with the compressor oils and some refrigerants.
Recycled refrigerant
Oxygen or compressed air
Nitrogen
Refrigerant
What acid is formed if the refrigerant contains chlorine?
Hydrochloric acid
Hydrofluoric acid
Sulfuric acid
Nitric acid
What is the purpose of the red marking on pipes for flammable refrigerants?
Indicate flow direction
Indicate flammability
Indicate pressure level
Indicate temperature
How often must a reusable container for refrigerant under high pressure be hydrostatically tested?
Every 2 years
Every 3 years
Every 5 years
Every 10 years
What must be attached to cylinders containing used refrigerant during transportation?
A barcode
A DOT classification tag and label
A warning sticker
A company logo
What is placed on a recovery cylinder to identify the type of refrigerant recovered?
A barcode
A refrigerant label
A color code
A serial number
What should be done to avoid accidental mixing of recovered refrigerants?
Use different colored cylinders
Use a recovery cylinder with a label
Store them in a cool place
Mix them with water
What is the pressure requirement for a disposable refrigerant cylinder before scrapping?
5 psig
10 psig
0 psig
15 psig
