NATE Exam: Air Conditioning and Heat Pumps Newest Exam / NATE Air
Conditioning and Heat Pumps Preparation
NATE EXAM: AIR CONDITIONING AND HEAT PUMPS NEWEST EXAM / NATE AIR
CONDITIONING AND HEAT PUMPS PREPARATION/NATE AIR CONDITIONING AND
HEAT PUMPS EXAM PRACTICE EXAM WITH 150 QUESTIONS AND CORRECT
ANSWERS| BRAND NEW VERSION!
Why are more circuits needed in the outdoor coils used in heat pumps than in the
condenser coils used in cooling-only units?
a. To keep the pressure drop across the outdoor coil high
b. To keep the pressure drop across the outdoor coil low
c. To provide more subcooling during the cooling cycle
d. To provide more subcooling during the heating cycle - Correct Answer-b (To
keep the pressure drop across the outdoor coil low)
What is the typical water flow rate per ton of cooling for water-source heat pumps
operating in closed-loop systems?
a. 3.0 gpm per ton
b. 2.5 gpm per ton
c. 2.0 gpm per ton
d. 1.5 gpm per ton - Correct Answer-a (3.0 gpm per ton)
What tool should be used to shorten a capillary tube?
1|Page
, NATE Exam: Air Conditioning and Heat Pumps Newest Exam / NATE Air
Conditioning and Heat Pumps Preparation
a. A pair of pliers with side-cutter edges
b. A small tubing cutter
c. Any tubing cutter approved for use on refrigerant tubing
d. A triangular or knife-edge file - Correct Answer-d (A triangular or knife-edge file)
Which pressure in a TEV is the opening pressure?
a. Bulb pressure
b. Evaporator pressure
c. Spring pressure
d. A combination of bulb and spring pressures - Correct Answer-a (Bulb pressure)
What affect does a low refrigerant charge have on reversing valve operation?
a. It causes the slider to overheat
b. It creates a hissing sound in the reversing valve
c. It increases the chance that the reversing valve will not be able to transfer
properly
d. It has no effect on reversing valve operation - Correct Answer-c (It increases the
chance that the reversing valve will not be able to transfer properly)
When adding a heat pump to an existing fossil-fuel furnace, an installer must do
all of the following except ____.
2|Page
, NATE Exam: Air Conditioning and Heat Pumps Newest Exam / NATE Air
Conditioning and Heat Pumps Preparation
a. add a control to prevent the heat pump and furnace from operating at the same
time during normal heating
b. confirm there is adequate clearance around the outdoor section for good air
flow
c. level the indoor coil's condensate pan to ensure proper drainage of condensate
water
d. make sure that the number of fins per inch of the new coils equals that of the
replaced coils - Correct Answer-d (make sure that the number of fins per inch of
the new coils equals that of the replaced coils)
What is the purpose of a receiver?
a. It prevents liquid refrigerant from slugging the compressor
b. It removes heat from refrigerant vapor
c. It returns oil to the compressor at a rate the compressor can tolerate
d. It stores liquid refrigerant - Correct Answer-d (It stores liquid refrigerant)
What is the typical storage life of modern refrigerants?
a. 5 to 10 years
b. 10 to 20 years
c. 20 to 30 years
3|Page
, NATE Exam: Air Conditioning and Heat Pumps Newest Exam / NATE Air
Conditioning and Heat Pumps Preparation
d. Modern refrigerants have an indefinite storage life - Correct Answer-d (Modern
refrigerants have an indefinite storage life)
Which of the following should be used to leak-test refrigerant tubing?
a. Compressed air
b. Dry nitrogen
c. Oxygen
d. Water - Correct Answer-b (Dry nitrogen)
Of the motors commonly used in HVACR systems, which type has the lowest
starting torque?
a. PSC motor
b. Shaded-pole mole
c. Split-phase motor
d. Three-phase motor - Correct Answer-b (Shaded-pole motor)
What is the typical phase angle for a split-capacitor motor?
a. 15°
b. 30°
c. 75°
4|Page
Conditioning and Heat Pumps Preparation
NATE EXAM: AIR CONDITIONING AND HEAT PUMPS NEWEST EXAM / NATE AIR
CONDITIONING AND HEAT PUMPS PREPARATION/NATE AIR CONDITIONING AND
HEAT PUMPS EXAM PRACTICE EXAM WITH 150 QUESTIONS AND CORRECT
ANSWERS| BRAND NEW VERSION!
Why are more circuits needed in the outdoor coils used in heat pumps than in the
condenser coils used in cooling-only units?
a. To keep the pressure drop across the outdoor coil high
b. To keep the pressure drop across the outdoor coil low
c. To provide more subcooling during the cooling cycle
d. To provide more subcooling during the heating cycle - Correct Answer-b (To
keep the pressure drop across the outdoor coil low)
What is the typical water flow rate per ton of cooling for water-source heat pumps
operating in closed-loop systems?
a. 3.0 gpm per ton
b. 2.5 gpm per ton
c. 2.0 gpm per ton
d. 1.5 gpm per ton - Correct Answer-a (3.0 gpm per ton)
What tool should be used to shorten a capillary tube?
1|Page
, NATE Exam: Air Conditioning and Heat Pumps Newest Exam / NATE Air
Conditioning and Heat Pumps Preparation
a. A pair of pliers with side-cutter edges
b. A small tubing cutter
c. Any tubing cutter approved for use on refrigerant tubing
d. A triangular or knife-edge file - Correct Answer-d (A triangular or knife-edge file)
Which pressure in a TEV is the opening pressure?
a. Bulb pressure
b. Evaporator pressure
c. Spring pressure
d. A combination of bulb and spring pressures - Correct Answer-a (Bulb pressure)
What affect does a low refrigerant charge have on reversing valve operation?
a. It causes the slider to overheat
b. It creates a hissing sound in the reversing valve
c. It increases the chance that the reversing valve will not be able to transfer
properly
d. It has no effect on reversing valve operation - Correct Answer-c (It increases the
chance that the reversing valve will not be able to transfer properly)
When adding a heat pump to an existing fossil-fuel furnace, an installer must do
all of the following except ____.
2|Page
, NATE Exam: Air Conditioning and Heat Pumps Newest Exam / NATE Air
Conditioning and Heat Pumps Preparation
a. add a control to prevent the heat pump and furnace from operating at the same
time during normal heating
b. confirm there is adequate clearance around the outdoor section for good air
flow
c. level the indoor coil's condensate pan to ensure proper drainage of condensate
water
d. make sure that the number of fins per inch of the new coils equals that of the
replaced coils - Correct Answer-d (make sure that the number of fins per inch of
the new coils equals that of the replaced coils)
What is the purpose of a receiver?
a. It prevents liquid refrigerant from slugging the compressor
b. It removes heat from refrigerant vapor
c. It returns oil to the compressor at a rate the compressor can tolerate
d. It stores liquid refrigerant - Correct Answer-d (It stores liquid refrigerant)
What is the typical storage life of modern refrigerants?
a. 5 to 10 years
b. 10 to 20 years
c. 20 to 30 years
3|Page
, NATE Exam: Air Conditioning and Heat Pumps Newest Exam / NATE Air
Conditioning and Heat Pumps Preparation
d. Modern refrigerants have an indefinite storage life - Correct Answer-d (Modern
refrigerants have an indefinite storage life)
Which of the following should be used to leak-test refrigerant tubing?
a. Compressed air
b. Dry nitrogen
c. Oxygen
d. Water - Correct Answer-b (Dry nitrogen)
Of the motors commonly used in HVACR systems, which type has the lowest
starting torque?
a. PSC motor
b. Shaded-pole mole
c. Split-phase motor
d. Three-phase motor - Correct Answer-b (Shaded-pole motor)
What is the typical phase angle for a split-capacitor motor?
a. 15°
b. 30°
c. 75°
4|Page
