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NATE Air-to-Air Heat Pump Exam (Latest Update 2026 / 2027) Practice Test Questions & Answers | Grade A | 100% Verified
Question:
A technician has just installed a heat pump. It heats satisfactorily, but will not
cool. A possible cause of the problem is the:
Answer:
Indoor check-valve is open.
Question:
Which instrument is used to check the velocity of air through a register?
Answer:
Anemometer.
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Question:
You observe a compressor cycling on and off while the condenser fan runs
continuously, but no cooling occurs. The reason for this problem is the:
Answer:
Refrigerant charge is low.
Question:
When checking flame current in a flame rectification circuit, you will be
checking:
Answer:
DC microamps.
Question:
In an air conditioning system, which of the following can cause head pressure to rise above the normal range?
Answer:
Non-condensable in the system.
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Question:
An R-22 system is operating with a discharge pressure of 211 PSIG. The measured temperature of the liquid line at the outdoor coil is 105*F. What is the sub-cooling?
Answer:
0*F
Question:
On a service call, a technician finds that the indoor coil is iced over, and the indoor blower motor is hot and is intermittently on and off. Which of the following would best explain these findings?
Answer:
A faulty motor or capacitor.
Question:
Which of the following is the device that removes the start capacitor from the electrical circuit as the hermetic compressor approaches operating speed?
Answer:
Potential relay.
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Question:
Partially restricting the return side of a duct system will cause the amperage
draw on a PSC blower-motor to:
Answer:
Decrease.
Question:
Lower-than-normal voltage on the compressor contactor coil can be caused:
Answer:
The thermostat wire size being too small.
Question:
After sealing a leaky duct system, what happens to the static pressure?
Answer:
Increases.
Question:
When refrigerant is being recovered from a system under reapri, the recovery
cylinder shall be filled to a maximum of (assume 135*F ambient temperature):
Answer:
80% of its rated capacity.
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