WorksheetsRefrigeration System Knowledge Assessment
Total questions: 15
Worksheet time: 8mins
What is the primary purpose of a moisture indicating sight glass in a refrigeration system?
To check the refrigerant level
To check the refrigerant for moisture
To measure the pressure of the refrigerant
To regulate the flow of refrigerant
Why should the liquid-line filter drier be replaced anytime a system is opened for service?
It becomes clogged with refrigerant
It loses its ability to filter moisture
It is a regulatory requirement
It is a standard maintenance procedure
What is the consequence of closing the discharge service valve on an operating reciprocating compressor?
It will increase the efficiency of the compressor
It can result in compressor damage and severe personal injury
It will decrease the system pressure
It will improve the cooling capacity
How does a crankcase heater help in a refrigeration system?
By increasing the refrigerant pressure
By reducing the amount of refrigerant in the oil and reducing oil foaming
By cooling the compressor
By increasing the system's cooling capacity
What is the purpose of using nitrogen when evacuating a system with large amounts of moisture?
To increase the system pressure
To counteract freezing of the moisture
To reduce the refrigerant charge
To improve the efficiency of the vacuum pump
Why is it important to maintain system pressure slightly above atmospheric pressure in an idled low-pressure refrigeration system?
To prevent refrigerant loss
To prevent air accumulation
To increase system efficiency
To reduce maintenance costs
What is the maximum test pressure when leak testing a low-pressure centrifugal chiller with nitrogen?
5 psig
10 psig
15 psig
20 psig
What is the role of a purge unit in a low-pressure chiller system?
To increase refrigerant pressure
To remove non-condensables that leak into the system
To add refrigerant to the system
To cool the refrigerant
According to ASHRAE Guideline 3, when should a system be checked for leaks during a standard vacuum test?
If the pressure rises from 1 mm Hg to above 2.5 mm Hg
If the pressure remains constant at 1 mm Hg
If the pressure drops below 1 mm Hg
If the pressure rises to 5 mm Hg
What is the EPA's maximum allowable leak rate for appliances used for comfort cooling as of January 1, 2019?
5% of the charge per year
10% of the charge per year
20% of the charge per year
30% of the charge per year
What should be done if a chiller with a charge of 200 pounds of an ozone-depleting refrigerant passes the initial verification leak test?
No further action is required
Conduct a follow-up verification test within 10 days
Increase the refrigerant charge
Replace the refrigerant with a non-ozone-depleting alternative
What is the primary reason for using a hydrostatic tube test kit in a refrigeration system?
To measure refrigerant pressure
To determine if a tube is leaking
To increase system efficiency
To reduce refrigerant charge
What is the consequence of having non-condensables, such as air, in a refrigeration system?
It will lower the system's cooling capacity
It will increase the discharge pressure of the system
It will reduce the refrigerant charge
It will improve system efficiency
What is the purpose of using a pressure regulator on nitrogen cylinders in a refrigeration system?
To increase the pressure of nitrogen
To reduce the pressure to a safe level
To measure the nitrogen pressure
To increase system efficiency
What should be done if an appliance with 50 or more pounds of a regulated refrigerant exceeds the threshold leak rate?
Ignore the leak and continue operation
Repair the appliance to bring the leak rate below the threshold, retrofit, or retire the appliance
Increase the refrigerant charge
Replace the refrigerant with a non-regulated alternative
