NATE EXAM CORE ESSENTIALS 121 REVISION
HANDBOOK 2026 ELECTRICAL SYSTEMS AND
MECHANICAL TROUBLESHOOTING
◉ Ch. 1-2 It is important to be _______ in filling out service orders so
that office staff, other technicians, and customers will know what
work you completed on the job.
a) clear
b) complete
c) concise
d) all of the above.
Answer: d) all of the above
◉ Ch. 1-3 When explaining to a customer that you have topped off
the system charge, which of the following terms is most
appropriate?
a) freon
b) gas
c) juice
d) refrigerant.
Answer: d) refrigerant
,◉ Ch. 1-4 Listening carefully to what a customer is telling you _______.
a) can help you diagnose the problem
b) is a waste of time
c) is not necessary
d) often will only confuse you.
Answer: a) can help you diagnose the problem
◉ Ch. 1-5 When you arrive at a service call and meet the customer,
you should ______.
a) ask questions first, then listen to what the customer has to say
b) listen to the customer first, then ask questions
c) avoid discussion with the customer
d) remind the customer that you are the professional and get on
with your work.
Answer: b) listen to the customer first, then ask questions
◉ Ch. 1-6 What is the volume of a room that measures 10 ft by 20 ft
with an 8 ft ceiling?
a) 800 ft^3
b) 1,600 ft^3
c) 2,400 ft^3
d) 3,200 ft^3.
, Answer: b) 1,600 ft^3
◉ Ch. 1-7 What is the cfm requirement for an 1,800 ft^2 house with
8 ft ceilings, if five air changes per hour are needed?
a) 400 cfm
b) 1,200 cfm
c) 1,600 cfm
d) 1,600 cfm.
Answer: b) 1,200 cfm
◉ Ch. 1-8 What is the cfm requirement for a 2,400 ft^2 house with 8
ft ceilings, if five air changes per hour are needed?
a) 400 cfm
b) 1,200 cfm
c) 1,600 cfm
d) 2,400 cfm.
Answer: c) 1,600 cfm
◉ Ch. 1-9 What is the cross sectional area of a 10 in. round metal
duct?
a) 79 in.^2
b) 200 in.^2
HANDBOOK 2026 ELECTRICAL SYSTEMS AND
MECHANICAL TROUBLESHOOTING
◉ Ch. 1-2 It is important to be _______ in filling out service orders so
that office staff, other technicians, and customers will know what
work you completed on the job.
a) clear
b) complete
c) concise
d) all of the above.
Answer: d) all of the above
◉ Ch. 1-3 When explaining to a customer that you have topped off
the system charge, which of the following terms is most
appropriate?
a) freon
b) gas
c) juice
d) refrigerant.
Answer: d) refrigerant
,◉ Ch. 1-4 Listening carefully to what a customer is telling you _______.
a) can help you diagnose the problem
b) is a waste of time
c) is not necessary
d) often will only confuse you.
Answer: a) can help you diagnose the problem
◉ Ch. 1-5 When you arrive at a service call and meet the customer,
you should ______.
a) ask questions first, then listen to what the customer has to say
b) listen to the customer first, then ask questions
c) avoid discussion with the customer
d) remind the customer that you are the professional and get on
with your work.
Answer: b) listen to the customer first, then ask questions
◉ Ch. 1-6 What is the volume of a room that measures 10 ft by 20 ft
with an 8 ft ceiling?
a) 800 ft^3
b) 1,600 ft^3
c) 2,400 ft^3
d) 3,200 ft^3.
, Answer: b) 1,600 ft^3
◉ Ch. 1-7 What is the cfm requirement for an 1,800 ft^2 house with
8 ft ceilings, if five air changes per hour are needed?
a) 400 cfm
b) 1,200 cfm
c) 1,600 cfm
d) 1,600 cfm.
Answer: b) 1,200 cfm
◉ Ch. 1-8 What is the cfm requirement for a 2,400 ft^2 house with 8
ft ceilings, if five air changes per hour are needed?
a) 400 cfm
b) 1,200 cfm
c) 1,600 cfm
d) 2,400 cfm.
Answer: c) 1,600 cfm
◉ Ch. 1-9 What is the cross sectional area of a 10 in. round metal
duct?
a) 79 in.^2
b) 200 in.^2
