NATE Exam: Core Essentials Questions and
Correct Answers
Question 1
What is the voltage of a circuit if the resistance is 5Ω and the current is 5 A?
a. 1 V
b. 2.5 V
c. 10 V
d. 25 V
Correct Answer
d (25 V)
Question 2
The voltage induced in each turn of the secondary coil of a transformer is ____.
a. half the voltage induced per turn of the primary coil
b. twice the voltage induced per turn of the primary coil
c. the same as the voltage induced per turn of the primary coil
d. determined by the ratio of turns in the primary coil to runs in the secondary coil
Correct Answer
c (the same as the voltage induced per turn of the primary coil)
Question 3
When a vapor is heated to a temperature higher than its saturation point, both the
added heat and the temperature above saturation are called ____.
a. latent heat
b. sensible heat
c. specific heat
d. superheat
Correct Answer
d (superheat)
Page 1 of 41
,Question 4
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
Correct Answer
b (listen to the customer first, then ask questions)
Question 5
When explaining to a customer that you have adjusted the system charge, which of
the following terms is most appropriate?
a. Freon
b. Gas
c. Juice
d. Refrigerant
Correct Answer
d (Refrigerant)
Question 6
What is the CFM requirements for an 1,800-ft2 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
Correct Answer
b (1,200 CFM)
Page 2 of 41
,Question 7
A natural cooling process produced by moisture on the skin changing to low-pressure
steam is called ____.
a. conduction
b. convection
c. evaporation
d. radiation
Correct Answer
c (evaporation)
Question 8
On all meters, digital and analog, the scale used should indicate the measurement
____.
a. close to the bottom of the range
b. close to the middle of the range
c. close to the top of the range
d. anywhere within the range
Correct Answer
b (close to the middle of the range)
Question 9
A run capacitor is always connected to the ____ and ____ terminals.
a. primary, secondary
b. run, common
c. start, common
d. start, run
Correct Answer
d (start, run)
Page 3 of 41
, Question 10
"Housekeeping" includes ____.
a. disposal of waste
b. fire prevention and protection
c. proper storage of materials
d. all of the above
Correct Answer
d (all of the above)
Question 11
A sling psychrometer uses two glass-stem thermometers. One measures dry-bulb,
and the other measures ____.
a. dew point
b. enthalpy
c. relative humidity
d. wet-bulb
Correct Answer
d (wet-bulb)
Question 12
An anemometer uses a small fan blade to measure ____.
a. air pressure
b. air velocity
c. air volume
d. static pressure
Correct Answer
b (air velocity)
Page 4 of 41
Correct Answers
Question 1
What is the voltage of a circuit if the resistance is 5Ω and the current is 5 A?
a. 1 V
b. 2.5 V
c. 10 V
d. 25 V
Correct Answer
d (25 V)
Question 2
The voltage induced in each turn of the secondary coil of a transformer is ____.
a. half the voltage induced per turn of the primary coil
b. twice the voltage induced per turn of the primary coil
c. the same as the voltage induced per turn of the primary coil
d. determined by the ratio of turns in the primary coil to runs in the secondary coil
Correct Answer
c (the same as the voltage induced per turn of the primary coil)
Question 3
When a vapor is heated to a temperature higher than its saturation point, both the
added heat and the temperature above saturation are called ____.
a. latent heat
b. sensible heat
c. specific heat
d. superheat
Correct Answer
d (superheat)
Page 1 of 41
,Question 4
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
Correct Answer
b (listen to the customer first, then ask questions)
Question 5
When explaining to a customer that you have adjusted the system charge, which of
the following terms is most appropriate?
a. Freon
b. Gas
c. Juice
d. Refrigerant
Correct Answer
d (Refrigerant)
Question 6
What is the CFM requirements for an 1,800-ft2 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
Correct Answer
b (1,200 CFM)
Page 2 of 41
,Question 7
A natural cooling process produced by moisture on the skin changing to low-pressure
steam is called ____.
a. conduction
b. convection
c. evaporation
d. radiation
Correct Answer
c (evaporation)
Question 8
On all meters, digital and analog, the scale used should indicate the measurement
____.
a. close to the bottom of the range
b. close to the middle of the range
c. close to the top of the range
d. anywhere within the range
Correct Answer
b (close to the middle of the range)
Question 9
A run capacitor is always connected to the ____ and ____ terminals.
a. primary, secondary
b. run, common
c. start, common
d. start, run
Correct Answer
d (start, run)
Page 3 of 41
, Question 10
"Housekeeping" includes ____.
a. disposal of waste
b. fire prevention and protection
c. proper storage of materials
d. all of the above
Correct Answer
d (all of the above)
Question 11
A sling psychrometer uses two glass-stem thermometers. One measures dry-bulb,
and the other measures ____.
a. dew point
b. enthalpy
c. relative humidity
d. wet-bulb
Correct Answer
d (wet-bulb)
Question 12
An anemometer uses a small fan blade to measure ____.
a. air pressure
b. air velocity
c. air volume
d. static pressure
Correct Answer
b (air velocity)
Page 4 of 41
