NATE EXAM CORE ESSENTIALS 121 LEARNING
WORKBOOK 2026 HVAC INSTALLATION AND
SERVICE SKILLS
◉ c (Micronic)
Answer: Which of the following is not a method of leak detection?
a. Soap bubbles
b. Electronic
c. Micronic
d. Ultrasonic
◉ a (Recovery machine)
Answer: To prevent the release of refrigerant to the atmosphere
while removing it from a system, what type of equipment must be
used?
a. Recovery machine
b. Recycling machine
c. Reclaim machine
d. Vacuum pump
,◉ b (air velocity)
Answer: An anemometer uses a small fan blade to measure ____.
a. air pressure
b. air velocity
c. air volume
d. static pressure
◉ c (No flux is required)
Answer: What is one of the advantages of using silver brazing rods
for copper-to-copper joints?
a. A lower melting temperature is required
b. A propane torch is normally used
c. No flux is required
d. No nitrogen purge is needed
◉ d (all of the above)
Answer: "Housekeeping" includes ____.
a. disposal of waste
b. fire prevention and protection
,c. proper storage of materials
d. all of the above
◉ b (Goggles)
Answer: What type of eye protection should you wear when drilling
overhead?
a. Face shield
b. Goggles
c. Side shields
d. Spectacles
◉ b (DOT)
Answer: What agency regulates cylinders and chemicals transported
in a service vehicle?
a. ASHRAE
b. DOT
c. EPA
d. OSHA
◉ a (contain information about personal protective equipment)
, Answer: Material safety data sheets ____.
a. contain information about personal protective equipment
b. do not provide recommendations regarding emergency
procedures
c. should be kept in a safe place off-site
d. should be read after any chemical products have been used
◉ d (Never)
Answer: When should oxygen be used in a refrigeration system?
a. To clear a restriction in the line
b. To pressurize for leak-testing
c. To purge lines for brazing
d. Never
◉ c (Class A is an "ordinary" fire that involves the burning of wood,
paper, or textile products, extinguishing agent: water. Class B is a fire
that contains oil, grease, paint, varnish, or other chemicals,
extinguishing agent: foam. Class C is an electrical fire, extinguishing
agent: carbon dioxide.)
Answer: Which of the following classifications of fire extinguishers
should be used for electrical fires?
WORKBOOK 2026 HVAC INSTALLATION AND
SERVICE SKILLS
◉ c (Micronic)
Answer: Which of the following is not a method of leak detection?
a. Soap bubbles
b. Electronic
c. Micronic
d. Ultrasonic
◉ a (Recovery machine)
Answer: To prevent the release of refrigerant to the atmosphere
while removing it from a system, what type of equipment must be
used?
a. Recovery machine
b. Recycling machine
c. Reclaim machine
d. Vacuum pump
,◉ b (air velocity)
Answer: An anemometer uses a small fan blade to measure ____.
a. air pressure
b. air velocity
c. air volume
d. static pressure
◉ c (No flux is required)
Answer: What is one of the advantages of using silver brazing rods
for copper-to-copper joints?
a. A lower melting temperature is required
b. A propane torch is normally used
c. No flux is required
d. No nitrogen purge is needed
◉ d (all of the above)
Answer: "Housekeeping" includes ____.
a. disposal of waste
b. fire prevention and protection
,c. proper storage of materials
d. all of the above
◉ b (Goggles)
Answer: What type of eye protection should you wear when drilling
overhead?
a. Face shield
b. Goggles
c. Side shields
d. Spectacles
◉ b (DOT)
Answer: What agency regulates cylinders and chemicals transported
in a service vehicle?
a. ASHRAE
b. DOT
c. EPA
d. OSHA
◉ a (contain information about personal protective equipment)
, Answer: Material safety data sheets ____.
a. contain information about personal protective equipment
b. do not provide recommendations regarding emergency
procedures
c. should be kept in a safe place off-site
d. should be read after any chemical products have been used
◉ d (Never)
Answer: When should oxygen be used in a refrigeration system?
a. To clear a restriction in the line
b. To pressurize for leak-testing
c. To purge lines for brazing
d. Never
◉ c (Class A is an "ordinary" fire that involves the burning of wood,
paper, or textile products, extinguishing agent: water. Class B is a fire
that contains oil, grease, paint, varnish, or other chemicals,
extinguishing agent: foam. Class C is an electrical fire, extinguishing
agent: carbon dioxide.)
Answer: Which of the following classifications of fire extinguishers
should be used for electrical fires?
