Practice Exam for NATE Heat Pump Final Questions and Answers
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Course
Nate heat pump service
Institution
Nate Heat Pump Service
Practice Exam for NATE Heat Pump Final
Questions and Answers
R-22 vapor line diameters and lengths are typically specified for a... - CORRECT
ANSWER-Vapor pressure drop that does not exceed a 6-7psi or 6 degrees F
The primary purpose of using flux when soldering copper or brass parts is... -
...
Practice Exam for NATE Heat Pump Final Questions and Answers R-22 vapor line diameters and lengths are typically specified for a... - CORRECT ANSWER -Vapor pressure drop that does not exceed a 6 -7psi or 6 degrees F The primary purpose of using flux when soldering copper or brass parts is... - CORRECT ANSWER -To prevent oxidation The water that results from a defrost cycle of an air to air heat pump(runoff) must... - CORRECT ANSWER -Drain off and away fro the outdoor coil to prevent excessive ice build up on the bottom of the coil and reduce capacity The component used to reduce sound transmission and prevent water leaks of a packaged heat pump installed on a roof is... - CORRECT ANSWER -Curb Gasket On some installations, a heat pump indoor coil can be installed on an existing, operable, fossil fuel furnace. When this type of installation is done, you need to add a control so that... - CORRECT ANSWER -The furnace and heat pump do not operate at the sam e time in normal heating When under a deep vacuum, a hermetic refrigeration compressor's motor windings could be... - CORRECT ANSWER -Damaged if energized In order for an evacuation to be considered complete... - CORRECT ANSWER -A heat pump refrigeration circuit should be evacuated to a vacuum pressure of 500 microns or below A system is supplied from the factory with charge for a 15 FOOT LINESET. The data plate shows the required system charge to be 5 POUNDS 10 OUNCES. The lineset uses 3/8 inch liquid line and is 25 FEET LONG. The manufacturers instruction sheet specifies 0.6 ounces of refrigerant to be added for each added foot of refrigerant line length so... - CORRECT ANSWER -The total refrigerant charge for the system would be 6 pounds Drive slips are typically installed on the... - CORRECT ANSWER -Shorter sides of rectangular duct To properly set a heat anticipator, it is necessary to... - CORRECT ANSWER -Check the 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... - CORRECT ANSWER -This temperature difference is referred to as coil TD The smallest refrigerant leak that an electronic leak detector should be capable of sensing is... - CORRECT ANSWER -1/2 an ounce a year When checking the pressures in an operating system with a manifold gauge set... - CORRECT ANSWER -Refrigerant oil in a hose will have no effect on the gauge reading At sea level, a gauge pressure of 35 psig is equal to an... - CORRECT ANSWER -
Absolute pressure of 49,7 psia A technician measures the return air temperature of a 100,000 Btu output furnace to be 65F and the supply side air temperature is 135F... - CORRECT ANSWER -The CFM should be 1323 A residential supply diffuser that is noisy because of a loose vane is best serviced by... - CORRECT ANSWER -Replacing the diffuser When performing preventive maintenance on a heat pump the technician should check the outdoor fan to be certain that the... - CORRECT ANSWER -Fan runs freely with no binding What is the effect of 170 volts supplied to a 208/230 volt compressor... - CORRECT ANSWER -Would cause a current 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... - CORRECT ANSWER -The most likely cause would be the liquid line is restricted A reason for cool air complaints when a heat pump is operating in the heating cycle... - CORRECT ANSWER -Excessive supply air velocities The following measurements are recorded on an operating heat pump system. The heat pump is operating with the compressor only with no auxiliary heat Heat pump only supply air temp. - 92F Heat pump only return air temp. -70F Outdoor temp. -54F Supply air temp./ AUX heat ON - 115F Return air temp./ AUX heat ON - 70F CFM - 1228 - CORRECT ANSWER -The heating capacity of the unit in would be 29,177 A dirty or clogged air filter in an operating heat pump system can cause... - CORRECT ANSWER -Inadequate heating To minimize noise problems in residential systems, what is the range(recommended to maximum) of design air velocity in the rectangular main supply trunk... - CORRECT ANSWER -700-900fpm
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