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NATE heat pump Exam Questions with Complete Solutions
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NATE heat pump Exam Questions with Complete Solutions
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NATE heat pump Exam Questions withComplete Solutions
R-22 vapor line diameters and lengths are typically specified for a vapor
pressure drop that does not exceed - -6-7 psi or 6 degress 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 from the outdoor coil to prevent - -
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 - -Curb gasket
-When under a deep vacuum, a hermetic refrigeration compressor's motor
windings could be ________ if energized - -Damaged
-In order for an evacuation to be considered complete, a heat pump
refrigerant 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 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 - -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 - -Shorter
-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 (temperature difference)
-The smallest refrigerant leak that an electronic leak detector should be
capable of sensing is - -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 - -No
effect
-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 65°F and the supply side air temperature is 135°F. The CFM
would be - -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 - -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 is - -excessive supply air velocities
-A dirty or clogged air filter in an operating heat pump system can cause - -
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 - -700 to 900 fpm
-The effect of adding a charge to sub cooling is - -it increases it
-When a capillary tube is overcharged you would get a ____ superheat and
____ sub cooling - -Low,high
-The effect of a low charge on the switchover operations of a reversing valve
is - -the reversing valves are less likely to transfer
-A technician is working on a heat pump with a capacitor start-capacitor run
compressor. On initial startup, the compressor hums momentarily and the
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