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NATE Heat Pump Exam Questions with Verified Answers
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NATE Heat Pump Exam Questions with Verified Answers
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NATE Heat Pump Exam Questionswith Verified Answers
R-22 vapor line diameters and lengths are typically specified for a... - -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...
- -To prevent oxidation
-The water that results from a defrost cycle of an air to air heat
pump(runoff) must... - -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... - -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... - -The furnace and heat pump do not
operate at the same time in normal heating
-When under a deep vacuum, a hermetic refrigeration compressor's motor
windings could be... - -Damaged if energized
-In order for an evacuation to be considered complete... - -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... - -The total
refrigerant charge for the system would be 6 pounds
-Drive slips are typically installed on the... - -Shorter sides of rectangular
duct
-To properly set a heat anticipator, it is necessary to... - -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... - -This temperature difference is referred to
as coil TD
-The smallest refrigerant leak that an electronic leak detector should be
capable of sensing is... - -1/2 an ounce a year
-When checking the pressures in an operating system with a manifold gauge
set... - -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... - -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... - -The CFM
should be 1323
-A residential supply diffuser that is noisy because of a loose vane is best
serviced by... - -Replacing the diffuser
-When performing preventive maintenance on a heat pump the technician
should check the outdoor fan to be certain that the... - -Fan runs freely with
no binding
-What is the effect of 170 volts supplied to a 208/230 volt compressor... - -
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... - -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... - -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 - -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... -
-Inadequate heating
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