NATE Heat Pump Exam Questions and
Correct Answers | Graded A+
R-22 vapor line diameters and lengths are typically specified for a vapor
pressure drop that does not exceed - 🧠ANSWER ✔✔6-7 psi or 6 degress F
The primary purpose of using flux when soldering copper or brass parts is to
prevent - 🧠ANSWER ✔✔Oxidation
The water that results from a defrost cycle of an air to air heat pump (runoff)
must drain off and away from the outdoor coil to prevent - 🧠ANSWER
✔✔Excessive ice build up
The component used to reduce sound transmission and prevent water leaks of a
packaged heat pump installed on a roof is the - 🧠ANSWER ✔✔Curb gasket
When under a deep vacuum, a hermetic refrigeration compressor's motor
windings could be ________ if energized - 🧠ANSWER ✔✔Damaged
In order for an evacuation to be considered complete, a heat pump refrigerant
circuit should be evacuated to a vacuum pressure of - 🧠ANSWER ✔✔500
microns or below
A system is supplied from the factory with charge for a 15 foot line set. The data
plate shows the required system charge to be 5 pounds 10 ounces. The line set
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COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER:
619652435. TERMS OF USE. PRIVACY STATEMENT. ALL RIGHTS RESERVED
,uses a 3/8 inch liquid line and is 25 feet long. The manufacturer's instruction
sheet specifies 0.6 ounces of refrigerant to be added for each added foot of
refrigerant line length so the total refrigerant charge for the system would be -
🧠ANSWER ✔✔6 lbs(25-15=10 10x0.6=6oz 6oz+5lbs 10oz= 5lbs 16oz the
equilvalent of 6lbs)
Drive slips are typically installed on the __________ sides of rectangular ducts -
🧠ANSWER ✔✔Shorter
To properly set a heat anticipator it is necessary to check the - 🧠ANSWER
✔✔heating control circuit amperage draw
A heat pump operating in normal ice free conditions maintains a certain
temperature difference between the outdoor coil temperature and the
surrounding outdoor ambient. This temperature difference is referred to as -
🧠ANSWER ✔✔Coil TD (temperature difference)
The smallest refrigerant leak that an electronic leak detector should be capable
of sensing is - 🧠ANSWER ✔✔0.05 oz. per year
When checking the pressures in an operating system with a manifold gauge set,
refrigerant oil in a hose will have ___ ______ on the gauge reading - 🧠ANSWER
✔✔No effect
Page 2 of 16
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER:
619652435. TERMS OF USE. PRIVACY STATEMENT. ALL RIGHTS RESERVED
, At sea level, a gauge pressure of 35 psig is equal to an absolute pressure of -
🧠ANSWER ✔✔49.7 psia
A technician measures the return air temperature of a 100,000 Btu output
furnace to be 65°F and the supply side air temperature is 135°F. The CFM would
be - 🧠ANSWER ✔✔1323 (TD= 135-65=70➡️100,000/TDx1.08
➡️100,000/75.6=1323)
A residential supply diffuser that is noisy because of a loose vane is best
serviced by - 🧠ANSWER ✔✔Replacing the diffuser
When performing preventive maintenance on a heat pump the technician
should check the outdoor fan to be certain that the fan - 🧠ANSWER ✔✔runs
freely with no binding
What is the effect of 170 volts supplied to a 208/230 volt compressor would
cause a current - 🧠ANSWER ✔✔increase and the motor may trip on overload
On a service call for a cooling problem with a heat pump, your inspections find a
liquid line that has condensation on it. The most likely cause would be the -
🧠ANSWER ✔✔liquid line is restricted
A reason for cool air complaints when a heat pump is operating in the heating
cycle is - 🧠ANSWER ✔✔excessive supply air velocities
Page 3 of 16
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER:
619652435. TERMS OF USE. PRIVACY STATEMENT. ALL RIGHTS RESERVED
Correct Answers | Graded A+
R-22 vapor line diameters and lengths are typically specified for a vapor
pressure drop that does not exceed - 🧠ANSWER ✔✔6-7 psi or 6 degress F
The primary purpose of using flux when soldering copper or brass parts is to
prevent - 🧠ANSWER ✔✔Oxidation
The water that results from a defrost cycle of an air to air heat pump (runoff)
must drain off and away from the outdoor coil to prevent - 🧠ANSWER
✔✔Excessive ice build up
The component used to reduce sound transmission and prevent water leaks of a
packaged heat pump installed on a roof is the - 🧠ANSWER ✔✔Curb gasket
When under a deep vacuum, a hermetic refrigeration compressor's motor
windings could be ________ if energized - 🧠ANSWER ✔✔Damaged
In order for an evacuation to be considered complete, a heat pump refrigerant
circuit should be evacuated to a vacuum pressure of - 🧠ANSWER ✔✔500
microns or below
A system is supplied from the factory with charge for a 15 foot line set. The data
plate shows the required system charge to be 5 pounds 10 ounces. The line set
Page 1 of 16
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER:
619652435. TERMS OF USE. PRIVACY STATEMENT. ALL RIGHTS RESERVED
,uses a 3/8 inch liquid line and is 25 feet long. The manufacturer's instruction
sheet specifies 0.6 ounces of refrigerant to be added for each added foot of
refrigerant line length so the total refrigerant charge for the system would be -
🧠ANSWER ✔✔6 lbs(25-15=10 10x0.6=6oz 6oz+5lbs 10oz= 5lbs 16oz the
equilvalent of 6lbs)
Drive slips are typically installed on the __________ sides of rectangular ducts -
🧠ANSWER ✔✔Shorter
To properly set a heat anticipator it is necessary to check the - 🧠ANSWER
✔✔heating control circuit amperage draw
A heat pump operating in normal ice free conditions maintains a certain
temperature difference between the outdoor coil temperature and the
surrounding outdoor ambient. This temperature difference is referred to as -
🧠ANSWER ✔✔Coil TD (temperature difference)
The smallest refrigerant leak that an electronic leak detector should be capable
of sensing is - 🧠ANSWER ✔✔0.05 oz. per year
When checking the pressures in an operating system with a manifold gauge set,
refrigerant oil in a hose will have ___ ______ on the gauge reading - 🧠ANSWER
✔✔No effect
Page 2 of 16
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER:
619652435. TERMS OF USE. PRIVACY STATEMENT. ALL RIGHTS RESERVED
, At sea level, a gauge pressure of 35 psig is equal to an absolute pressure of -
🧠ANSWER ✔✔49.7 psia
A technician measures the return air temperature of a 100,000 Btu output
furnace to be 65°F and the supply side air temperature is 135°F. The CFM would
be - 🧠ANSWER ✔✔1323 (TD= 135-65=70➡️100,000/TDx1.08
➡️100,000/75.6=1323)
A residential supply diffuser that is noisy because of a loose vane is best
serviced by - 🧠ANSWER ✔✔Replacing the diffuser
When performing preventive maintenance on a heat pump the technician
should check the outdoor fan to be certain that the fan - 🧠ANSWER ✔✔runs
freely with no binding
What is the effect of 170 volts supplied to a 208/230 volt compressor would
cause a current - 🧠ANSWER ✔✔increase and the motor may trip on overload
On a service call for a cooling problem with a heat pump, your inspections find a
liquid line that has condensation on it. The most likely cause would be the -
🧠ANSWER ✔✔liquid line is restricted
A reason for cool air complaints when a heat pump is operating in the heating
cycle is - 🧠ANSWER ✔✔excessive supply air velocities
Page 3 of 16
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER:
619652435. TERMS OF USE. PRIVACY STATEMENT. ALL RIGHTS RESERVED
