NATE EXAM CORE ESSENTIALS 121 EXAM
PREPARATION PACK 2026 KEY CONCEPTS
AND REVISION NOTES
◉ d (solder tubing without the use of couplings)
Answer: A swaging tool is used to ____.
a. cut copper tubing
b. make a mechanical joint in tubing
c. remove burrs from piping
d. solder tubing without the use of couplings
◉ a (It is very accurate)
Answer: What is one of the advantages of a glass-stem
thermometer?
a. It is very accurate
b. It is very durable
c. It comes with a digital readout
d. Non of the above
,◉ b (dry-bulb)
Answer: In discussing human comfort, the temperature most
commonly referred to is ____.
a. dew point
b. dry-bulb
c. wet-bulb
d. Fahrenheit
◉ d (wet-bulb)
Answer: 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
◉ b (Bourdon tube)
Answer: A standard refrigeration manifold uses what type of
element to measure pressure?
,a. Bellows
b. Bourdon tube
c. Diaphragm
d. Spring
◉ c (30 in. Hg to 350 psig)
Answer: What is the pressure range of a standard compound gauge
on a refrigerant manifold?
a. 0 to 350 psig
b. 0 to 500 psig
c. 30 in. Hg to 350 psig
d. 30 in. Hg to 500 psig
◉ d (Vacuum pump)
Answer: What is the best tool for removing moisture and non-
condensibles from a system before adding refrigerant?
a. Manifold gauge
b. Micron analyzer
c. Recovery machine
d. Vacuum pump
, ◉ b (microns)
Answer: A vacuum gauge reads pressure in ____.
a. inches of mercury
b. microns
c. psia
d. psig
◉ 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?
PREPARATION PACK 2026 KEY CONCEPTS
AND REVISION NOTES
◉ d (solder tubing without the use of couplings)
Answer: A swaging tool is used to ____.
a. cut copper tubing
b. make a mechanical joint in tubing
c. remove burrs from piping
d. solder tubing without the use of couplings
◉ a (It is very accurate)
Answer: What is one of the advantages of a glass-stem
thermometer?
a. It is very accurate
b. It is very durable
c. It comes with a digital readout
d. Non of the above
,◉ b (dry-bulb)
Answer: In discussing human comfort, the temperature most
commonly referred to is ____.
a. dew point
b. dry-bulb
c. wet-bulb
d. Fahrenheit
◉ d (wet-bulb)
Answer: 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
◉ b (Bourdon tube)
Answer: A standard refrigeration manifold uses what type of
element to measure pressure?
,a. Bellows
b. Bourdon tube
c. Diaphragm
d. Spring
◉ c (30 in. Hg to 350 psig)
Answer: What is the pressure range of a standard compound gauge
on a refrigerant manifold?
a. 0 to 350 psig
b. 0 to 500 psig
c. 30 in. Hg to 350 psig
d. 30 in. Hg to 500 psig
◉ d (Vacuum pump)
Answer: What is the best tool for removing moisture and non-
condensibles from a system before adding refrigerant?
a. Manifold gauge
b. Micron analyzer
c. Recovery machine
d. Vacuum pump
, ◉ b (microns)
Answer: A vacuum gauge reads pressure in ____.
a. inches of mercury
b. microns
c. psia
d. psig
◉ 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?
