NATE HEAT PUMP EXAM QUESTIONS
AND ANSWERS (VERIFIED AND
UPDATED)
R-22 vapor line diameters and lengths are typically specified for a vapor pressure drop that does
not exceed - ANS 6-7 psi or 6 degress F
The primary purpose of using flux when soldering copper or brass parts is to prevent -
ANS 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 - ANS 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 - ANS Curb gasket
When under a deep vacuum, a hermetic refrigeration compressor's motor windings could be
________ if energized - ANS Damaged
In order for an evacuation to be considered complete, a heat pump refrigerant circuit should be
evacuated to a vacuum pressure of - ANS 500 microns or below
@2026/2027 ALLRIGHTS RESERVED.
, 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 - ANS 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 - ANS Shorter
To properly set a heat anticipator it is necessary to check the - ANS 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 - ANS Coil TD (temperature difference)
The smallest refrigerant leak that an electronic leak detector should be capable of sensing is -
ANS 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 - ANS No effect
At sea level, a gauge pressure of 35 psig is equal to an absolute pressure of - ANS 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 - ANS 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 -
ANS Replacing the diffuser
@2026/2027 ALLRIGHTS RESERVED.
AND ANSWERS (VERIFIED AND
UPDATED)
R-22 vapor line diameters and lengths are typically specified for a vapor pressure drop that does
not exceed - ANS 6-7 psi or 6 degress F
The primary purpose of using flux when soldering copper or brass parts is to prevent -
ANS 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 - ANS 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 - ANS Curb gasket
When under a deep vacuum, a hermetic refrigeration compressor's motor windings could be
________ if energized - ANS Damaged
In order for an evacuation to be considered complete, a heat pump refrigerant circuit should be
evacuated to a vacuum pressure of - ANS 500 microns or below
@2026/2027 ALLRIGHTS RESERVED.
, 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 - ANS 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 - ANS Shorter
To properly set a heat anticipator it is necessary to check the - ANS 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 - ANS Coil TD (temperature difference)
The smallest refrigerant leak that an electronic leak detector should be capable of sensing is -
ANS 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 - ANS No effect
At sea level, a gauge pressure of 35 psig is equal to an absolute pressure of - ANS 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 - ANS 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 -
ANS Replacing the diffuser
@2026/2027 ALLRIGHTS RESERVED.
