NATE heat pump Exam and Answers
With an R-410A condensing pressure of 395 psig and a liquid line temperature of 108°F what is
the sub cooling temperature? - ✔✔D. 8°F
When performing maintenance on a heat pump the technician should check the outdoor fan to
be certain: - ✔✔C. The fan runs freely without binding or vibrations
The continuity of a fuse in a disconnect should be tested by checking resistance: - ✔✔A. With
power off
Why does the outdoor fan on a heat pump stopped during defrost? - ✔✔C. Minimize defrost
time
It technician measures the return air temperature of 100,000 BTU output furnace to be 65°F
and the supply side air temperature is 135°F. what is the SCFM(standard CFM)? - ✔✔B. 1323
SCFM
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 temperature 92°F, heat pump only return air temperature 70°F,
outdoor temperature 54°F, supply air temp./Auxiliary heat on 115°F, return air temp./Auxiliary
heat on 70°F, CFM 1228
What is the heating capacity of the unit in BTU/H? - ✔✔D. 29,177 btu/h
R-410A Vapor in line diameters with links 50 feet or less are typically specified for a vapor
pressure drop that does not exceed what value? - ✔✔B. 3 psi
Which of the following is used to make accurate residential loan calculations? - ✔✔B. ACCA
manual J
, The following conditions exist in a circuit that supplies power to three parallel loads:
One load is resistive, one load is capacitive, one load is inductive
The total current in the circuit when operating will be: - ✔✔D. The sum of the currents through
each load
what condition can cause a reduction from design capacity in a heat pump? - ✔✔A. An
undersized vapor line
What can happen if defrost runoff is not properly drained away? - ✔✔B. Ice can build up on the
bottom of the coil
Undersized ductwork often cause: - ✔✔C. High air quantities and high static pressures
Where is the sensor of an outdoor ambient thermostat for a heat pump system typically
installed? - ✔✔C. In the entering airstream to the outdoor coil
What effect does a low charge have on the switch over operations of a reversing valve? - ✔✔C.
Reversing valves are less likely to shift if charge is very low
The technician is using an analog multi meter to check a run capacitor. With the meter set to
OHMS the needle swings towards zero and then slowly rise is toward infinity. What does this
tell the technician about the capacitor? - ✔✔D. The capacitor charges and discharges
What is the typical method of staging a two stage compressor in a heat pump system? - ✔✔B. It
is based on deviation from the thermostat set point
In a heat pump refrigerant circuit, and open check valve is used to: - ✔✔A. Bypass refrigerant
flow around a metering device
With an R-410A condensing pressure of 395 psig and a liquid line temperature of 108°F what is
the sub cooling temperature? - ✔✔D. 8°F
When performing maintenance on a heat pump the technician should check the outdoor fan to
be certain: - ✔✔C. The fan runs freely without binding or vibrations
The continuity of a fuse in a disconnect should be tested by checking resistance: - ✔✔A. With
power off
Why does the outdoor fan on a heat pump stopped during defrost? - ✔✔C. Minimize defrost
time
It technician measures the return air temperature of 100,000 BTU output furnace to be 65°F
and the supply side air temperature is 135°F. what is the SCFM(standard CFM)? - ✔✔B. 1323
SCFM
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 temperature 92°F, heat pump only return air temperature 70°F,
outdoor temperature 54°F, supply air temp./Auxiliary heat on 115°F, return air temp./Auxiliary
heat on 70°F, CFM 1228
What is the heating capacity of the unit in BTU/H? - ✔✔D. 29,177 btu/h
R-410A Vapor in line diameters with links 50 feet or less are typically specified for a vapor
pressure drop that does not exceed what value? - ✔✔B. 3 psi
Which of the following is used to make accurate residential loan calculations? - ✔✔B. ACCA
manual J
, The following conditions exist in a circuit that supplies power to three parallel loads:
One load is resistive, one load is capacitive, one load is inductive
The total current in the circuit when operating will be: - ✔✔D. The sum of the currents through
each load
what condition can cause a reduction from design capacity in a heat pump? - ✔✔A. An
undersized vapor line
What can happen if defrost runoff is not properly drained away? - ✔✔B. Ice can build up on the
bottom of the coil
Undersized ductwork often cause: - ✔✔C. High air quantities and high static pressures
Where is the sensor of an outdoor ambient thermostat for a heat pump system typically
installed? - ✔✔C. In the entering airstream to the outdoor coil
What effect does a low charge have on the switch over operations of a reversing valve? - ✔✔C.
Reversing valves are less likely to shift if charge is very low
The technician is using an analog multi meter to check a run capacitor. With the meter set to
OHMS the needle swings towards zero and then slowly rise is toward infinity. What does this
tell the technician about the capacitor? - ✔✔D. The capacitor charges and discharges
What is the typical method of staging a two stage compressor in a heat pump system? - ✔✔B. It
is based on deviation from the thermostat set point
In a heat pump refrigerant circuit, and open check valve is used to: - ✔✔A. Bypass refrigerant
flow around a metering device
