WorksheetsEPA 608 Final Exam Rd. 4
Total questions: 105
Worksheet time: 53mins
Name
Class
Date
1.
Student Name
4 lines
2.
Core
4 lines
3.
What is the proper procedure for checking for noncondensable gases in a refrigeration cylinder?
a)
A) Shake the cylinder and listen for a sloshing sound
b)
B) Measure the pressure at a stable temperature and compare it to the saturation chart
c)
C) Release a small amount of refrigerant and smell it
d)
D) Use a vacuum pump to extract air
4.
Which type of refrigerant can be legally vented?
a)
A) R-410A
b)
B) R-22
c)
C) Nitrogen
d)
D) R-134a
5.
What documentation must be maintained for refrigerant purchases?
a)
a) Invoice only
b)
b) Technician certification only
c)
c) Both invoice and technician certification
d)
d) No documentation required
6.
What is the maximum cylinder filling density for most refrigerants?
a)
a) 80%
b)
b) 85%
c)
c) 90%
d)
d) 95%
7.
What is the purpose of an oil separator in a refrigeration system?
a)
A) To clean the refrigerant
b)
B) To remove moisture
c)
C) To return oil to the compressor
d)
D) To separate refrigerant blends
8.
How often must recovery equipment be tested for leaks?
a)
a) Monthly
b)
b) Quarterly
c)
c) Annually
d)
d) Every time it's used
9.
What should be done if refrigerant gets in your eyes?
a)
a) Rub them immediately
b)
b) Wait for them to clear
c)
c) Flush with water and seek medical attention
d)
d) Apply eye drops
10.
What is the proper way to store recovery cylinders?
a)
a) In direct sunlight
b)
b) In a cool, dry location
c)
c) Near heat sources
d)
d) Outside in any weather
11.
When is it acceptable to vent refrigerant to the atmosphere?
a)
a) Never
b)
b) During servicing
c)
c) In small amounts
d)
d) When system pressure is high
12.
What temperature should recovery cylinders be heated to?
a)
a) Room temperature
b)
b) Never heated
c)
c) 125°F
d)
d) 150°F
13.
What does GWP (Global Warming Potential) measure?
a)
A) The efficiency of a refrigerant
b)
B) The amount of heat a refrigerant absorbs
c)
C) The impact of a refrigerant on global warming compared to CO₂
d)
D) The toxicity level of a refrigerant
14.
Why is it important to recover refrigerant?
a)
A) To reduce system pressure
b)
B) To protect the ozone layer and prevent pollution
c)
C) To make the system run faster
d)
D) To remove excess moisture
15.
What should be done if a system contains a mixed refrigerant?
a)
A) Vent it to the atmosphere
b)
B) Recover it into a separate recovery cylinder
c)
C) Use it in another system
d)
D) Dispose of it in a landfill
16.
Which of the following describes a refrigerant blend that acts like a single compound?
a)
A) Azeotropic
b)
B) Zeotropic
c)
C) HFC
d)
D) HCFC
17.
What does the term "sublimation" refer to in the refrigeration process?
a)
A) Liquid turning into gas
b)
B) Gas turning into liquid
c)
C) Solid changing directly into gas
d)
D) Water freezing at high altitudes
18.
What tool is used to detect leaks in a refrigeration system?
a)
A) Vacuum pump
b)
B) Electronic leak detector
c)
C) Micron gauge
d)
D) Ammeter
19.
How should different types of recovered refrigerants be handled?
a)
a) Mixed together
b)
b) Kept separate by type
c)
c) Combined if similar
d)
d) Mixed if same manufacturer
20.
What is the proper procedure for checking system pressure?
a)
a) Use manifold gauges rated for the refrigerant
b)
b) Use any available pressure gauge
c)
c) Estimate based on temperature
d)
d) Check compressor amperage
21.
Which of these refrigerants has the highest ozone depletion potential?
a)
a) R-134a
b)
b) R-410A
c)
c) R-12
d)
d) R-32
22.
What information must be included on recovered refrigerant containers?
a)
a) Type of refrigerant only
b)
b) Date only
c)
c) Type of refrigerant and date
d)
d) Type of refrigerant, date, and whether contaminated or uncontaminated
23.
What happens if moisture enters a refrigerant system?
a)
A) It improves system efficiency
b)
B) It prevents oil from circulating
c)
C) It can form acids and damage components
d)
D) It increases cooling capacity
24.
Why should refrigerant never be mixed?
a)
A) It improves system efficiency
b)
B) It makes recovery impossible
c)
C) It creates a safer refrigerant blend
d)
D) It reduces system pressure
25.
What should a technician do before disposing of a refrigerant cylinder?
a)
A) Leave a small amount of refrigerant inside
b)
B) Refill it with nitrogen
c)
C) Recover all remaining refrigerant and properly mark it as empty
d)
D) Cut it in half
26.
How should refrigerant be recovered from a system?
a)
a) Vented to the atmosphere
b)
b) Using EPA-approved recovery equipment
c)
c) Released into water
d)
d) Burned off
27.
What is the maximum allowable leak rate for commercial refrigeration equipment containing more than 50 pounds of refrigerant?
a)
a) 10% per year
b)
b) 15% per year
c)
c) 20% per year
d)
d) 30% per year
28.
TYPE 1
4 lines
29.
Which of the following is a requirement under EPA regulations when servicing a small appliance?
a)
A) Technicians must recover 90% of the refrigerant if the compressor is functional
b)
B) Venting is allowed if the refrigerant is non-toxic
c)
C) Releasing up to 10% of refrigerant is acceptable
d)
D) Recovery is not required for appliances under 5 pounds
30.
What type of recovery system relies on the system’s compressor to remove refrigerant?
a)
A) Active recovery
b)
B) Passive recovery
c)
C) Direct venting
d)
D) Pressure differential recovery
31.
What should be done if the recovery cylinder becomes full during recovery?
a)
a) Stop recovery
b)
b) Switch to another approved cylinder
c)
c) Vent excess refrigerant
d)
d) Continue recovery
32.
When can a small appliance be opened without recovering the refrigerant?
a)
a) Never
b)
b) If pressure is zero
c)
c) If compressor is bad
d)
d) If unit is unplugged
33.
What must be done after installing a piercing access valve on a refrigerant system?
a)
A) Leak-test the valve before proceeding
b)
B) Immediately begin recovering refrigerant
c)
C) Release refrigerant to check pressure
d)
D) Remove the valve once the job is complete
34.
What happens if moisture enters a refrigeration system?
a)
A) It improves cooling efficiency
b)
B) It forms acids and damages system components
c)
C) It increases system pressure
d)
D) It lowers the system's temperature
35.
What information must be recorded when recovering refrigerant from small appliances?
a)
a) Type of refrigerant only
b)
b) Amount recovered only
c)
c) Date and type of refrigerant
d)
d) No documentation required
36.
What is the proper method for evacuating non-condensables from a recovery cylinder?
a)
a) Vent off the top
b)
b) Use a recovery machine
c)
c) Wait for separation
d)
d) Use a vacuum pump
37.
What is the best practice for removing non-condensable gases from a refrigerant system?
a)
A) Purging the system with nitrogen
b)
B) Using a vacuum pump to evacuate the system
c)
C) Releasing the gases into the atmosphere
d)
D) Adding more refrigerant to dilute the gases
38.
What component can be damaged if liquid refrigerant is recovered too quickly?
a)
A) Evaporator coil
b)
B) Expansion valve
c)
C) Compressor
d)
D) Fan motor
39.
How should different types of refrigerants recovered from small appliances be handled?
a)
a) Mixed together
b)
b) Kept separate
c)
c) Combined if similar
d)
d) Mixed if from same manufacturer
40.
What should be done with recovery equipment filters?
a)
a) Clean and reuse them
b)
b) Replace when indicated by the manufacturer
c)
c) Never replace them
d)
d) Replace monthly
41.
What documentation is required when disposing of small appliances?
a)
a) None
b)
b) Recovery log only
c)
c) Disposal log only
d)
d) Recovery and disposal logs
42.
When disposing of an old refrigerator, what must be done before sending it to a landfill?
a)
A) Remove and recover the refrigerant
b)
B) Remove the compressor and burn off the refrigerant
c)
C) Add more refrigerant to balance pressures
d)
D) Drill holes in the refrigerant lines
43.
What is the maximum allowable percentage a recovery cylinder can be filled to?
a)
A) 50%
b)
B) 80%
c)
C) 90%
d)
D) 100%
44.
When replacing a compressor in a small appliance, what must be done first?
a)
a) Remove the old compressor
b)
b) Recover the refrigerant
c)
c) Add nitrogen
d)
d) Check the pressure
45.
What is the proper procedure for leak testing a small appliance?
a)
a) Pressurize with air
b)
b) Use electronic leak detector
c)
c) Use soap bubbles only
d)
d) Visual inspection only
46.
What type of recovery equipment is required for small appliances?
a)
a) Only EPA-certified equipment
b)
b) Any vacuum pump
c)
c) Any recovery machine
d)
d) Equipment rated for high pressure only
47.
Why should a recovery cylinder not be overfilled?
a)
A) It causes oil contamination
b)
B) It can lead to excessive system pressures and rupture
c)
C) It reduces system efficiency
d)
D) It prevents the refrigerant from being reused
48.
Which of the following refrigerants is classified as an HFC?
a)
A) R-12
b)
B) R-134a
c)
C) R-22
d)
D) R-502
49.
What should be done with contaminated refrigerant recovered from small appliances?
a)
a) Mix it with clean refrigerant
b)
b) Send it for reclamation
c)
c) Use it in other equipment
d)
d) Release it to the atmosphere
50.
How should refrigerant be transferred from a recovery cylinder to a storage cylinder?
a)
a) By gravity
b)
b) Using a recovery machine
c)
c) Using compressed air
d)
d) By heating the recovery cylinder
51.
What is the main disadvantage of using a Schrader valve?
a)
A) It leaks more easily than other valve types
b)
B) It requires special tools to install
c)
C) It cannot be used for refrigerant recovery
d)
D) It cannot handle high-pressure refrigerants
52.
What should be done if a piercing valve remains installed on a system after service?
a)
A) It should be left open to allow refrigerant to flow freely
b)
B) It should be capped or replaced with a permanent fitting
c)
C) It should be removed immediately
d)
D) Nothing, as it has no effect on system performance
53.
When recovering refrigerant from a system with a non-operational compressor, what method should be used?
a)
A) Active recovery using a recovery machine
b)
B) Passive recovery using the system's compressor
c)
C) Venting the refrigerant to the air
d)
D) Using a vacuum pump
54.
TYPE 2
4 lines
55.
What should be done if a system has been opened for service and moisture is present?
a)
A) Perform a deep vacuum to remove moisture
b)
B) Charge the system immediately
c)
C) Flush the system with water
d)
D) Increase the system pressure
56.
What must be done to a refrigerant cylinder before disposal?
a)
A) Vent all remaining refrigerant
b)
B) Recover all refrigerant and mark it as empty
c)
C) Store it in a cool, dry place
d)
D) Fill it with nitrogen
57.
What information must be recorded when recovering refrigerant?
a)
a) Amount only
b)
b) Type only
c)
c) Date and location only
d)
d) Type, amount, date, and location
58.
How should recovery equipment be maintained?
a)
a) Clean after each use
b)
b) According to manufacturer specifications
c)
c) Monthly cleaning
d)
d) Annual service only
59.
What is the proper procedure for releasing refrigerant from a recovery cylinder?
a)
a) Use recovery machine
b)
b) Never release refrigerant
c)
c) Vent slowly to atmosphere
d)
d) Use system pressure
60.
What is a proper method to detect moisture in a refrigerant system?
a)
A) Checking for water droplets on the condenser
b)
B) Using a filter drier with a sight glass
c)
C) Measuring system superheat
d)
D) Shaking the recovery cylinder
61.
What is the maximum allowable percentage that a recovery cylinder can be filled?
a)
A) 50%
b)
B) 70%
c)
C) 80%
d)
D) 100%
62.
What safety requirements apply when working with R-410A?
a)
a) Safety glasses only
b)
b) Gloves only
c)
c) Safety glasses and gloves
d)
d) Full face shield required
63.
What is the proper method for changing filter driers?
a)
a) Recover refrigerant first
b)
b) Pump system down only
c)
c) Isolate filter drier only
d)
d) Cut and replace quickly
64.
Which of the following is required before adding refrigerant to an empty system?
a)
A) Cleaning the condenser coil
b)
B) Checking the air filter
c)
C) Performing a vacuum leak test
d)
D) Replacing the expansion valve
65.
Which of the following is an acceptable method for removing non-condensable gases from a refrigerant system?
a)
A) Venting the refrigerant
b)
B) Evacuating the system with a vacuum pump
c)
C) Adding more refrigerant
d)
D) Pressurizing with nitrogen
66.
How should different types of high-pressure refrigerants be handled?
a)
a) Can be mixed if similar pressure
b)
b) Must be kept separate
c)
c) Can be mixed if same manufacturer
d)
d) Can be mixed if both HFCs
67.
What type of oil is used with R-410A systems?
a)
a) Mineral oil
b)
b) POE oil
c)
c) AB oil
d)
d) PAG oil
68.
What is the proper way to purge air from a recovery machine?
a)
a) Run machine with ports open
b)
b) Use vacuum pump
c)
c) Start recovery process
d)
d) Add refrigerant and purge
69.
How should a technician check for leaks in an HVAC system?
a)
A) By feeling for cold spots
b)
B) By using an electronic leak detector
c)
C) By listening for hissing sounds
d)
D) By overcharging the system
70.
What is the primary purpose of an expansion valve?
a)
A) To remove moisture from refrigerant
b)
B) To regulate refrigerant flow into the evaporator
c)
C) To increase refrigerant pressure
d)
D) To cool the compressor
71.
Which of the following is considered a non-condensable gas in a refrigerant system?
a)
A) Oxygen
b)
B) Refrigerant vapor
c)
C) Compressor oil
d)
D) R-22
72.
When must systems be pressure tested after installation?
a)
a) Never
b)
b) Only if leaks are suspected
c)
c) Always before charging
d)
d) Only during winter
73.
What is the required recovery level for R-410A at temperatures above 50°F?
a)
a) 0 inches of mercury
b)
b) 4 inches of mercury
c)
c) 10 inches of mercury
d)
d) 15 inches of mercury
74.
What should be done if liquid refrigerant is trapped in a line?
a)
a) Heat the line
b)
b) Cut the line
c)
c) Wait for it to evaporate
d)
d) Use recovery machine to remove it
75.
What is the proper method for leak testing a high-pressure system?
a)
a) Pressurize with nitrogen to normal operating pressure
b)
b) Pressurize with nitrogen to maximum working pressure
c)
c) Use system refrigerant only
d)
d) Use compressed air
76.
What is the main function of the compressor in an HVAC system?
a)
A) To remove moisture from refrigerant
b)
B) To change a high-pressure liquid into a low-pressure liquid
c)
C) To circulate refrigerant through the system
d)
D) To absorb heat from the condenser
77.
When charging a system with liquid refrigerant, where should the refrigerant be added?
a)
A) Into the discharge line
b)
B) Into the liquid line
c)
C) Into the low-side service port
d)
D) Directly into the compressor
78.
What does the term "superheat" refer to?
a)
A) The temperature at which refrigerant condenses
b)
B) The heat added to refrigerant vapor after it has evaporated
c)
C) The total pressure in the condenser
d)
D) The heat removed by the evaporator
79.
What happens if air enters a refrigeration system?
a)
A) It causes acid buildup
b)
B) It raises discharge pressures
c)
C) It reduces system efficiency
d)
D) All of the above
80.
TYPE 3
4 lines
81.
What documentation is required for low-pressure system maintenance?
a)
a) Service dates only
b)
b) Amount of refrigerant added only
c)
c) Purge unit operation only
d)
d) Complete maintenance records including all of the above
82.
When should relief valves be tested on low-pressure systems?
a)
a) Monthly
b)
b) Quarterly
c)
c) Annually
d)
d) Never
83.
What is the proper method for determining system charge in a low-pressure system?
a)
a) Check pressure only
b)
b) Check liquid level
c)
c) Weigh refrigerant added
d)
d) Check temperature only
84.
What is the purpose of a sight glass in a low-pressure refrigeration system?
a)
A) To check refrigerant levels
b)
B) To monitor oil circulation
c)
C) To detect moisture or contaminants
d)
D) All of the above
85.
Why should a vacuum pump be connected to both sides of a low-pressure system during evacuation?
a)
A) To equalize system pressure
b)
B) To remove moisture and air more efficiently
c)
C) To prevent oil loss
d)
D) To reduce compressor workload
86.
How can a technician tell if a purge unit is working properly?
a)
A) It releases excessive refrigerant
b)
B) It collects only non-condensable gases
c)
C) It increases system pressure
d)
D) It continuously cycles on and off
87.
How often should low-pressure cutout switches be tested?
a)
a) Monthly
b)
b) Quarterly
c)
c) Semi-annually
d)
d) Annually
88.
What action should be taken if the purge unit runs continuously?
a)
a) Shut down system
b)
b) Check for leaks
c)
c) Replace purge unit
d)
d) Add refrigerant
89.
How should different types of low-pressure refrigerants be handled?
a)
a) Can be mixed
b)
b) Must be kept separate
c)
c) Can be mixed if similar
d)
d) Can be mixed if clean
90.
When charging a low-pressure system, where should the refrigerant be introduced?
a)
A) Into the discharge line
b)
B) Into the high-pressure side
c)
C) Into the evaporator charging valve
d)
D) Into the compressor crankcase
91.
What is the best way to prevent air from entering a low-pressure system during service?
a)
A) Maintain system pressure above atmospheric pressure
b)
B) Use a high-capacity vacuum pump
c)
C) Always add nitrogen before recovery
d)
D) Remove all system oil before servicing
92.
If a low-pressure system fails to hold a vacuum after evacuation, what does this indicate?
a)
A) The system is clean and ready for refrigerant
b)
B) The compressor is faulty
c)
C) The system has a leak
d)
D) The system needs more refrigerant
93.
When should a purge unit be operated?
a)
Option 1
b)
a) Only during maintenance
c)
b) Only when system is running
d)
c) Automatically as needed
e)
d) Only during startup
94.
What is the proper method for removing refrigerant from oil in a low-pressure system?
a)
a) Heat oil
b)
b) Filter oil
c)
c) Separate by settling
d)
d) Use distillation
95.
How should a low-pressure system be tested for leaks after repair?
a)
a) Pressurize with nitrogen
b)
b) Use standing vacuum test
c)
c) Use halide torch
d)
d) Use soap bubbles
96.
What must be done before disposing of a low-pressure appliance?
a)
A) Recover the refrigerant
b)
B) Cut the compressor lines
c)
C) Flush the system with water
d)
D) Store it in a cool, dry place
97.
Which type of oil is typically used in a low-pressure system with R-123?
a)
A) Mineral oil
b)
B) Alkylbenzene oil
c)
C) Polyolester (POE) oil
d)
D) Glycol oil
98.
How can non-condensable gases be removed from a low-pressure system?
a)
A) By using a purge unit
b)
B) By venting them
c)
C) By adding more refrigerant
d)
D) By increasing system pressure
99.
What should be done if water enters a low-pressure system?
a)
a) Continue operation
b)
b) Dehydrate system
c)
c) Add oil
d)
d) Change filters only
100.
How should oil be added to a low-pressure system?
a)
a) Through charging port
b)
b) Through oil pump
c)
c) Through purge unit
d)
d) Through pressure relief valve
101.
When recovering refrigerant from a low-pressure system, what should be done to speed up the process?
a)
A) Lower the pressure to 0 psig
b)
B) Heat the system with hot water or heating blankets
c)
C) Open the purge valve
d)
D) Add nitrogen to the system
102.
What is the primary purpose of a cooling tower in a low-pressure system?
a)
A) To heat refrigerant before entering the condenser
b)
B) To cool and condense refrigerant vapor
c)
C) To pressurize refrigerant for better flow
d)
D) To act as a secondary evaporator
103.
Where is the lowest temperature typically found in a low-pressure system?
a)
A) Compressor
b)
B) Condenser
c)
C) Evaporator
d)
D) Expansion valve
104.
How does a purge unit help maintain a low-pressure refrigeration system?
a)
A) It removes non-condensable gases
b)
B) It adds refrigerant when needed
c)
C) It increases the system pressure
d)
D) It removes excess oil from the compressor
105.
What is the proper storage method for R-123?
a)
a) In sealed containers at room temperature
b)
b) In open containers
c)
c) Under pressure
d)
d) At low temperature only
100 %
