NATE Exam: Air Conditioning and Heat Pumps with Answers 100% Pass
1. d (All of the Which of the following factors affects a customer's level of
above: air move- comfort?
ment, humidity,
temperature) a. Air movement
b. Humidity
c. Temperature
d. All of the above
2. c (+15%) A cooling load calculation estimates the sensible heat gain
of a structure. The maximum sensible capacity of a cool-
ing-only system should be within % of this calculated
value.
a. ±10%
b. +10%
c. +15%
d. +30%
3. d (+25%) The maximum sensible cooling capacity of a heat pump
should be within % of the calculated sensible heat
gain of a structure with a large heating load.
a. ±10%
b. +15%
c. -25%
d. +25%
4. b (15%) The combined output of a heat pump and its auxiliary heat
should not exceed the calculated heat loss of a home by
more than %.
a. 10%
b. 15%
c. 20%
d. 25%
5. b (3.2 kWh) What amount of auxiliary electric heat is needed when the
output of a heat pump on a design day equals 18,800 Btuh
and the heat loss of a home is 29,700 Btuh?
,NATE Exam: Air Conditioning and Heat Pumps with Answers 100% Pass
a. 2.1 kWh
b. 3.2 kWh
c. 5.0 kWh
d. 10.9 kWh
Note: 3,413 Btu/kW
6. b (radiation) The three processes that transfer heat energy are conduc-
tion, convection, and .
a. concentration
b. radiation
c. refraction
d. static pressure
7. b (conduction) 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
8. d (The refrig- What effect does raising the pressure in a sealed system
erant's boiling have on refrigerant?
point increases)
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
d. The refrigerant's boiling point increases
9. d (Suffocation What is the primary danger to people near an accidental
caused by the refrigerant release or spill?
heavier refriger-
ant displacing a. Blurred vision caused by the refrigerant vapor coming
oxygen in the air) 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
10. c (125°F, 80%) 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%
11. c (Evaporator) Boiling of the refrigerant occurs in which system compo-
nent?
a. Compressor
b. Condenser
c. Evaporator
d. Metering device
12. a (It ensures that Why is superheat necessary in a system that utilizes her-
dry vapor reach- metic compressors?
es the compres-
sor so that me- a. It ensures that dry vapor reaches the compressor so
chanical damage that mechanical damage does not occur
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
13. d (Suction pres- When the heat load on an evaporator increases, what is
sure and dis- the effect on the system?
charge pressure
both increase) a. Suction pressure decreases and discharge pressure
increases
b. Suction pressure increases and discharge pressure
decreases
1. d (All of the Which of the following factors affects a customer's level of
above: air move- comfort?
ment, humidity,
temperature) a. Air movement
b. Humidity
c. Temperature
d. All of the above
2. c (+15%) A cooling load calculation estimates the sensible heat gain
of a structure. The maximum sensible capacity of a cool-
ing-only system should be within % of this calculated
value.
a. ±10%
b. +10%
c. +15%
d. +30%
3. d (+25%) The maximum sensible cooling capacity of a heat pump
should be within % of the calculated sensible heat
gain of a structure with a large heating load.
a. ±10%
b. +15%
c. -25%
d. +25%
4. b (15%) The combined output of a heat pump and its auxiliary heat
should not exceed the calculated heat loss of a home by
more than %.
a. 10%
b. 15%
c. 20%
d. 25%
5. b (3.2 kWh) What amount of auxiliary electric heat is needed when the
output of a heat pump on a design day equals 18,800 Btuh
and the heat loss of a home is 29,700 Btuh?
,NATE Exam: Air Conditioning and Heat Pumps with Answers 100% Pass
a. 2.1 kWh
b. 3.2 kWh
c. 5.0 kWh
d. 10.9 kWh
Note: 3,413 Btu/kW
6. b (radiation) The three processes that transfer heat energy are conduc-
tion, convection, and .
a. concentration
b. radiation
c. refraction
d. static pressure
7. b (conduction) 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
8. d (The refrig- What effect does raising the pressure in a sealed system
erant's boiling have on refrigerant?
point increases)
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
d. The refrigerant's boiling point increases
9. d (Suffocation What is the primary danger to people near an accidental
caused by the refrigerant release or spill?
heavier refriger-
ant displacing a. Blurred vision caused by the refrigerant vapor coming
oxygen in the air) 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
10. c (125°F, 80%) 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%
11. c (Evaporator) Boiling of the refrigerant occurs in which system compo-
nent?
a. Compressor
b. Condenser
c. Evaporator
d. Metering device
12. a (It ensures that Why is superheat necessary in a system that utilizes her-
dry vapor reach- metic compressors?
es the compres-
sor so that me- a. It ensures that dry vapor reaches the compressor so
chanical damage that mechanical damage does not occur
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
13. d (Suction pres- When the heat load on an evaporator increases, what is
sure and dis- the effect on the system?
charge pressure
both increase) a. Suction pressure decreases and discharge pressure
increases
b. Suction pressure increases and discharge pressure
decreases
