NATE AC Service Certification 2025/2026
Exam Questions and Correct Answers |
New Update
A system is supplied from the factory with charge of 5 pounds 10 ounces for a 15
foot line set. The line set is 25 feet long. The manufacturer's instruction sheet
specifies 0.6 ounces of refrigeration to be added for each added foot of refrigerant
line set length. What is the total refrigerant charge for the system?
A. 6 ounces
B. 5 pounds
C. 5 pounds 10 ounces
D. 6 pounds - 🧠ANSWER ✔✔D. 6 pounds
15ft - 25ft = 10ft x .6 = 6 ounces
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 1
STATEMENT. ALL RIGHTS RESERVED
,5 pounds + 10 ounces + 6 ounces
5 pounds + 16 ounces = 6 pounds
The purpose of using flux when soldering is to:
A. anneal the surface.
B. give better heat flow.
C. reduce oxidation.
D. pre-seal the oxidation. - 🧠ANSWER ✔✔C. reduce oxidation.
Outdoor condensing units that are installed in areas where flooding is possible
must:
A. be mounted above flood level.
B. utilize NEMA 1 enclosures.
C. be mounted under an overhanging eave.
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 2
STATEMENT. ALL RIGHTS RESERVED
,D. use water resistant components. - 🧠ANSWER ✔✔A. be mounted above flood
level.
The component used to reduce sound transmission and prevent water leaks on a
rooftop air conditioner packaged unit installation is the:
A. curb gasket.
B. silicone caulk.
C. roof flashing.
D. roofing tar. - 🧠ANSWER ✔✔A. curb gasket.
Return air leakage in a hot attic will:
A. Increase capacity
B. Decrease capacity
C. Increase airflow
D. Decrease airflow - 🧠ANSWER ✔✔B. Decrease capacity
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 3
STATEMENT. ALL RIGHTS RESERVED
, An air conditioner refrigerant circuit should be evacuated to a minimum of:
A. 0 microns.
B. 200 microns.
C. 500 microns.
D. 1200 microns. - 🧠ANSWER ✔✔C. 500 microns.
Which of the following substances could create an extremely dangerous condition
if used to check refrigeration system for leaks?
A. R-22
B. Nitrogen
C. Oxygen
D. Carbon Dioxide - 🧠ANSWER ✔✔D. Carbon Dioxide
The subcooling method for checking charge is generally used on air conditioners
with what type of metering?
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 4
STATEMENT. ALL RIGHTS RESERVED
Exam Questions and Correct Answers |
New Update
A system is supplied from the factory with charge of 5 pounds 10 ounces for a 15
foot line set. The line set is 25 feet long. The manufacturer's instruction sheet
specifies 0.6 ounces of refrigeration to be added for each added foot of refrigerant
line set length. What is the total refrigerant charge for the system?
A. 6 ounces
B. 5 pounds
C. 5 pounds 10 ounces
D. 6 pounds - 🧠ANSWER ✔✔D. 6 pounds
15ft - 25ft = 10ft x .6 = 6 ounces
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 1
STATEMENT. ALL RIGHTS RESERVED
,5 pounds + 10 ounces + 6 ounces
5 pounds + 16 ounces = 6 pounds
The purpose of using flux when soldering is to:
A. anneal the surface.
B. give better heat flow.
C. reduce oxidation.
D. pre-seal the oxidation. - 🧠ANSWER ✔✔C. reduce oxidation.
Outdoor condensing units that are installed in areas where flooding is possible
must:
A. be mounted above flood level.
B. utilize NEMA 1 enclosures.
C. be mounted under an overhanging eave.
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 2
STATEMENT. ALL RIGHTS RESERVED
,D. use water resistant components. - 🧠ANSWER ✔✔A. be mounted above flood
level.
The component used to reduce sound transmission and prevent water leaks on a
rooftop air conditioner packaged unit installation is the:
A. curb gasket.
B. silicone caulk.
C. roof flashing.
D. roofing tar. - 🧠ANSWER ✔✔A. curb gasket.
Return air leakage in a hot attic will:
A. Increase capacity
B. Decrease capacity
C. Increase airflow
D. Decrease airflow - 🧠ANSWER ✔✔B. Decrease capacity
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 3
STATEMENT. ALL RIGHTS RESERVED
, An air conditioner refrigerant circuit should be evacuated to a minimum of:
A. 0 microns.
B. 200 microns.
C. 500 microns.
D. 1200 microns. - 🧠ANSWER ✔✔C. 500 microns.
Which of the following substances could create an extremely dangerous condition
if used to check refrigeration system for leaks?
A. R-22
B. Nitrogen
C. Oxygen
D. Carbon Dioxide - 🧠ANSWER ✔✔D. Carbon Dioxide
The subcooling method for checking charge is generally used on air conditioners
with what type of metering?
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 4
STATEMENT. ALL RIGHTS RESERVED
