HVAC NATE HEAT PUMP EXAMINATION TEST
2026 QUESTIONS WITH ANSWERS GRADED
A+
◉ 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 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
, ◉ 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
2026 QUESTIONS WITH ANSWERS GRADED
A+
◉ 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 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
, ◉ 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
