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Module 03205 Exam
Leak Detection, Evacuation, Recovery, and Charging
Trainee Name: _________________________________________________________________
Social Security Number: _________________________________ Date: __________________
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1. Two refrigerants exempted from the EPA requirement to recover, recycle, and reclaim are
_____.
a. ammonia and carbon dioxide
b. ammonia and hydrogen sulfide
c. carbon dioxide and hydrogen sulfide
d. hydrogen sulfide and butane
2. Which of the following is the only EPA-approved refrigerant that can be used for leak
testing?
a. HFC-410A
b. HFC-134a
c. HFC-407C
d. HCFC-22
3. When pressurizing a system for leak testing, a safe test pressure is typically _____.
a. 50 psig
b. 75 psig
c. 125 psig
d. 250 psig
4. A typical nitrogen cylinder is charged to a pressure of roughly _____.
a. 3,500 psig
b. 2,000 psig
c. 1,000 psig
d. 250 psig
5. An apprentice in training is exempt from the technician certification requirement for a period
of _____.
a. five years after training has been completed
b. two years after training has been completed
c. five years from the date the apprenticeship was initially registered
d. two years from the date the apprenticeship was initially registered
6. For the most serious violations of the Clean Air Act, the EPA will _____.
a. file an administrative order directing the party to comply with the law
b. issue a field citation, much like a speeding ticket, for the violation
c. issue a Section 114 letter to the accused
d. prosecute the case in federal court
______________________________________________________________________________
HVAC, Module 03205 V5 Exam
Copyright © 2018 NCCER. Permission is granted to reproduce this page provided that copies are for local use only and that each copy contains this notice.
Page 1 of 4
7. When using a self-contained recovery unit to recover refrigerant vapor, the discharge of the
recovery unit is typically connected to _____.
a. a suitable plastic recovery bag
b. a recovery cylinder
c. the high-side port of the gauge manifold
d. the low-side port of the gauge manifold
8. Which of the following situations typically prevents the use of the push-pull method of
refrigerant recovery?
a. The system is equipped with a fixed metering device.
b. The system is equipped with a TXV.
c. The system being recovered contains 7 pounds of refrigerant.
d. The system being recovered contains 36 pounds of refrigerant.
9. Moisture in a system reacts with refrigerant to form _____.
a. an azeotrope
b. acids
c. air
d. nitrogen
10. The oil in a vacuum pump should be changed _____.
a. about every five minutes of pump operation
b. only when changing from one refrigerant to another
c. during or immediately after pumping down a wet system
d. about every 25 hours of pump operation
11. A vacuum pump with a capacity of 6–12 cfm should be adequate to evacuate systems with
capacities up to _____.
a. 10 tons
b. 30 tons
c. 50 tons
d. 100 tons
12. Which of the following values is closest to a perfect vacuum?
a. 50 microns
b. 500 microns
c. 1,300 microns
d. 25,000 microns
______________________________________________________________________________
HVAC, Module 03205 V5 Exam
Copyright © 2018 NCCER. Permission is granted to reproduce this page provided that copies are for local use only and that each copy contains this notice.
Page 2 of 4
13. During or following an evacuation, which of the following typically indicates a refrigerant
circuit has a leak?
a. The vacuum gauge drops rapidly to 500 microns and will not go lower.
b. The vacuum gauge shows a pressure rise that continues up to 0 psig when the pump is
isolated.
c. The vacuum gauge shows a pressure rise but levels off between 1,000 and 2,000 microns
when the pump is isolated.
d. A constant reading on the vacuum gauge of 500 microns is displayed when the pump is
isolated.
14. Near-azeotropic refrigerants are technically _____.
a. HFCs
b. HCFCs
c. zeotropes
d. compounds
15. When charging a system that uses a zeotropic refrigerant, the system should always be
charged using _____.
a. the superheat method
b. the subcooling method
c. vapor refrigerant from the cylinder
d. liquid refrigerant from the cylinder
16. The range of temperatures within which a zeotropic refrigerant changes state at a given
pressure is known as its _____.
a. saturation range
b. latent-heat band
c. fractionation rate
d. temperature glide
17. What is the best way to tell if a disposable refrigerant cylinder is equipped with a dip tube?
a. Crack the valve to see what comes out
b. Determine if it is an HFC or an HCFC
c. Determine if it is azeotropic or near-azeotropic
d. Check the cylinder labeling
18. A technician should use a charging scale to weigh charged refrigerant _____.
a. only when a system holds less than one pound
b. on every occasion, regardless of the method used
c. only if the customer requests it
d. when zeotropic refrigerants are being charged
19. Charging by superheat is performed on systems that use a _____.
a. fixed-orifice metering device
b. thermostatic expansion valve
c. sight glass
d. thermal-electric expansion valve
______________________________________________________________________________
HVAC, Module 03205 V5 Exam
Copyright © 2018 NCCER. Permission is granted to reproduce this page provided that copies are for local use only and that each copy contains this notice.
Page 3 of 4
20. Which of the following statements is true?
a. Systems with fixed metering devices cannot be charged accurately using the superheat
method.
b. Systems with fixed metering devices cannot be charged accurately by weight.
c. Systems with TXVs cannot be charged accurately using the superheat method.
d. Systems with TXVs cannot be charged accurately by weight.
______________________________________________________________________________
HVAC, Module 03205 V5 Exam
Copyright © 2018 NCCER. Permission is granted to reproduce this page provided that copies are for local use only and that each copy contains this notice.
Page 4 of 4
Module 03205 Answer Key
Leak Detection, Evacuation, Recovery, and Charging
Question
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
Answer
A
D
C
B
D
D
B
C
B
C
B
A
B
C
D
D
D
B
A
C
Section Reference
1.0.0
1.2.2
1.2.2
1.2.2
2.1.2
2.1.6
2.2.4
2.2.5
3.1.0
3.2.1
3.2.1; Table 4
3.2.2
3.2.4
4.0.0
4.0.0
4.0.0
4.1.1
4.1.2
4.2.2
4.2.3
Objective
1
1b
1b
1b
1b
2a
2b
2b
3a
3b
3b
3b
3b
4
4
4
4a
4a
4b
4b