NATE Exam: Air Conditioning and Heat Pumps/ 95 Q&A/ .
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Course
NATE
Institution
NATE
NATE Exam: Air Conditioning and Heat Pumps/ 95 Q&A/ . Terms like:
Heat transfer that occurs when substances of different temperatures are in contact with each other is called ____.
a. concentration
b. conduction
c. convection
d. radiation - Answer: b (conduction)
What effect does raisi...
NATE Exam: Air Conditioning and Heat Pumps/
95 Q&A/ 2024-2025.
Heat transfer that occurs when substances of different temperatures are in
contact with each other is called ____.
a. concentration
b. conduction
c. convection
d. radiation - Answer: b (conduction)
What effect does raising the pressure in a sealed system have on refrigerant?
a. It becomes more difficult to subcool the liquid refrigerant
b. It becomes more difficult to superheat the refrigerant vapor
c. The refrigerant's boiling point decreases
Page 1 of 35
,d. The refrigerant's boiling point increases - Answer: d (The refrigerant's boiling
point increases)
What is the primary danger to people near an accidental refrigerant release or
spill?
a. Blurred vision caused by the refrigerant vapor coming in contact with the eyes
b. Changes in weather patterns caused by global warming
c. Damage to the food chain caused by decreased ozone levels in the stratosphere
d. Suffocation caused by the heavier refrigerant displacing oxygen in the air -
Answer: d (Suffocation caused by the heavier refrigerant displacing oxygen in the
air)
The maximum temperature at which refrigerant may be stored is ____°F when the
container is no more than ____% full of liquid by volume.
a. 120°F, 60%
b. 125°F, 60%
c. 125°F, 80%
d. 135°F, 80% - Answer: c (125°F, 80%)
Boiling of the refrigerant occurs in which system component?
a. Compressor
b. Condenser
Page 2 of 35
,c. Evaporator
d. Metering device - Answer: c (Evaporator)
Why is superheat necessary in a system that utilizes hermetic compressors?
a. It ensures that dry vapor reaches the compressor so that mechanical damage
does not occur
b. It increases system capacity
c. It prevents liquid refrigerant from gassing the metering device
d. Superheat is necessary only when open compressors are being used - Answer: a
(It ensures that dry vapor reaches the compressor so that mechanical damage
does not occur)
When the heat load on an evaporator increases, what is the effect on the system?
a. Suction pressure decreases and discharge pressure increases
b. Suction pressure increases and discharge pressure decreases
c. Suction pressure and discharge pressure both decrease
d. Suction pressure and discharge pressure both increase - Answer: d (Suction
pressure and discharge pressure both increase)
What type of energy is transferred when work is done in the condenser?
a. Latent heat energy
b. Sensible heat energy
Page 3 of 35
, c. Both latent and sensible heat energy
d. Neither latent nor sensible heat energy - Answer: c (Both latent and sensible
heat energy)
What is the primary function performed by a thermal expansion valve?
a. It maintains the correct superheat in the hot vapor leaving the compressor
b. It maintains the correct superheat in the suction vapor leaving the evaporator
c. It maintains the proper subcooling level in the liquid refrigerant
d. It prevents flash vapor bubbles from developing in refrigerant entering the
evaporator - Answer: b (It maintains the correct superheat in the suction vapor
leaving the evaporator)
Which component pumps refrigerant through the system and raises the vapor
temperature?
a. Accumulator
b. Compressor
c. Condenser
d. Evaporator - Answer: b (Compressor)
How are hermetic compressor motors cooled?
a. With air drawn around the compressor shell by the condenser fan
b. With water circulated through tubing wrapped around the compressor shell
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