NATE CORE FINAL PAPER 2026 QUESTIONS
WITH FULL ANSWERS
◉ 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?
a. A
b. B
c. C
d. D
◉ d (All of the above: asphyxiating, flammable, toxic). Answer:
Which of the following categories could be considered a hazardous
atmosphere in a confined space?
a. Asphyxiating
b. Flammable
c. Toxic
d. All of the above
◉ a (Low oxygen level). Answer: Which of the following best
describes an asphyxiating atmosphere?
a. Low oxygen level
,b. Presence of ammonia
c. Presence of carbon monoxide
d. Presence of nitrogen
◉ c (5 ft). Answer: If a ladder is placed against a wall that is 20 ft tall,
what is the proper distance away from the wall for the base of the
ladder?
a. 3 ft
b. 4 ft
c. 5 ft
d. 6 ft
◉ c (maintain three points of contact). Answer: When using a ladder,
you should always ____.
a. extend the ladder 18 in. above the roof line
b. face away from the ladder
c. maintain three points of contact
d. straddle the space between the ladder and a nearby object
◉ a (Disconnect and lock out power before starting unless testing
requires the power to be on). Answer: What is one of the most
, important safety precautions that you can take when working on
electrical equipment?
a. Disconnect and lock out power before starting unless testing
requires the power to be on
b. Keep one hand in your pocket while working on the power circuit
c. Label all hot wires before starting
d. Wear gloves suitable for high voltages
◉ a (When current travels through a ground path other than the
neutral). Answer: When does a ground fault circuit interrupter open
an electric circuit?
a. When current travels through a ground path other than the
neutral
b. When the circuit is overloaded
c. When there is a short circuit
d. All of the above
◉ b (only by the person who installed the locks). Answer: Proper
lockout/tagout procedures state that locks placed on a lockout
device may be removed ____.
a. by anyone on the job site
WITH FULL ANSWERS
◉ 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?
a. A
b. B
c. C
d. D
◉ d (All of the above: asphyxiating, flammable, toxic). Answer:
Which of the following categories could be considered a hazardous
atmosphere in a confined space?
a. Asphyxiating
b. Flammable
c. Toxic
d. All of the above
◉ a (Low oxygen level). Answer: Which of the following best
describes an asphyxiating atmosphere?
a. Low oxygen level
,b. Presence of ammonia
c. Presence of carbon monoxide
d. Presence of nitrogen
◉ c (5 ft). Answer: If a ladder is placed against a wall that is 20 ft tall,
what is the proper distance away from the wall for the base of the
ladder?
a. 3 ft
b. 4 ft
c. 5 ft
d. 6 ft
◉ c (maintain three points of contact). Answer: When using a ladder,
you should always ____.
a. extend the ladder 18 in. above the roof line
b. face away from the ladder
c. maintain three points of contact
d. straddle the space between the ladder and a nearby object
◉ a (Disconnect and lock out power before starting unless testing
requires the power to be on). Answer: What is one of the most
, important safety precautions that you can take when working on
electrical equipment?
a. Disconnect and lock out power before starting unless testing
requires the power to be on
b. Keep one hand in your pocket while working on the power circuit
c. Label all hot wires before starting
d. Wear gloves suitable for high voltages
◉ a (When current travels through a ground path other than the
neutral). Answer: When does a ground fault circuit interrupter open
an electric circuit?
a. When current travels through a ground path other than the
neutral
b. When the circuit is overloaded
c. When there is a short circuit
d. All of the above
◉ b (only by the person who installed the locks). Answer: Proper
lockout/tagout procedures state that locks placed on a lockout
device may be removed ____.
a. by anyone on the job site
