WorksheetsFAB-101 EPA Week 5 Homework (Type III)
Total questions: 15
Worksheet time: 8mins
What is the maximum test pressure for leak testing a low-pressure centrifugal chiller with nitrogen?
5 psig
10 psig
15 psig
20 psig
How can charged low-pressure refrigeration machines be most effectively leak checked?
By adding refrigerant
By reducing pressure
By adding heat with hot water or heating blankets
By cooling the system
What type of compressors are particularly susceptible to leaks from the shaft seal?
Open-drive type compressors
Closed-drive type compressors
Rotary compressors
Scroll compressors
According to ASHRAE Guideline 3, when should a system be checked for leaks?
If pressure rises from 1 mm Hg to 2.5 mm Hg
If pressure drops from 2.5 mm Hg to 1 mm Hg
If temperature increases
If refrigerant levels decrease
What happens once the threshold leak rate has been exceeded on a system using a regulated refrigerant?
The system must be replaced
The system must be repaired
The refrigerant must be removed
The refrigerant must be increased
As of January 1, 2019, what is the maximum leak rate for comfort cooling?
10% of the charge per year
20% of the charge per year
30% of the charge per year
40% of the charge per year
How long does an owner have to repair an appliance that has 50 pounds or more of refrigerant and has exceeded the threshold leak rate?
10 days
18 months
30 days
3 years
What is the typical high-pressure cut-out control setting for a low-pressure chiller?
0 psig
5 psig
10 psig
15 psig
What is the deadline for conducting an initial verification test after a chiller with 200 pounds of refrigerant passes the initial leak test?
5 days
10 days
15 days
20 days
What should be done to refrigerant oil before removal to ensure less refrigerant is contained in the oil?
Cool it to 32°F
Heat it to 130°F
Freeze it to 0°F
Boil it to 212°F
What is the required recovery vacuum for a low-pressure appliance to be disposed?
10 mm of Hg absolute
15 mm of Hg absolute
20 mm of Hg absolute
25 mm of Hg absolute
What is the effect of warming the liquid refrigerant in the system with hot water?
It increases system pressure
It brings the system pressure out of a vacuum
It decreases system pressure
It freezes the refrigerant
How should all pressure relief valves be installed in machine rooms?
In series
In parallel
Randomly
Vertically
What safety equipment should be worn when working with liquid refrigerant for low-pressure systems?
Hard hat and boots
Gloves and safety goggles
Ear plugs and mask
Apron and face shield
When the TLV-TWA is exceeded what is required?
An evacuation of the building and Emergency First Responders notified.
Each machinery room activate an alarm and a mechanical ventilation system.
To pull the fire alarm to safely evacuate the building.
To notify the Safety Commissioner on staff.
