NATE Heat Pump Latest Exam and All
Correct Answers 2025-2026 Updated.
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 degrees 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 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
, 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
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
A dirty or clogged air filter in an operating heat pump system can cause - Answer inadequate
heating
To minimize noise problems in residential duct systems, the range (recommended to maximum)
of design air velocity in the rectangular main supply trunk is - Answer 700 to 900 fpm
The effect of adding a charge to sub cooling is - Answer it increases it
When a capillary tube is overcharged you would get a ____ superheat and ____ sub cooling -
Correct Answers 2025-2026 Updated.
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 degrees 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 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
, 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
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
A dirty or clogged air filter in an operating heat pump system can cause - Answer inadequate
heating
To minimize noise problems in residential duct systems, the range (recommended to maximum)
of design air velocity in the rectangular main supply trunk is - Answer 700 to 900 fpm
The effect of adding a charge to sub cooling is - Answer it increases it
When a capillary tube is overcharged you would get a ____ superheat and ____ sub cooling -
