8. NATE Industry Competency Exam Commercial

• NATE Industry Competency Exam Commercial

Refrigeration Latest Update 2025-2026 100 Questions and 100% Verified Correct Answers Guaranteed A+

A frozen food case is equipped with two defrost heaters, each is rated 2 Kw at 230 volts.With the case in defrost, the amperage reading on the common wires to parallel

connected heaters if one heater is burned out is approximately:

• 8.7 A.
• 13.25 A.
• 17.4 A.

d. 0.87 A. - CORRECT ANSWER: A

A method of achieving proportional or modulating output from electronic controls is by

using:

• Transformers.
• Thermistors.
• Contactors.

d. Double pole switches - CORRECT ANSWER: B

A minimum velocity for suction gas through vertical risers is necessary in order to:

• Ensure oil return up the riser.
• Improve oil separator efficiency.
• Keep suction gas from absorbing too much superheat on its way back to the

compressor. 1 / 3

• Ensure that no liquid refrigerant returns to the compressor. - CORRECT ANSWER: A

A multi-evaporator multi-compressor supermarket system uses EPR's on each lineup of refrigerated cases. When a TEV in this system requires adjustment, its associated EPR

must be adjusted first because the:

• EPR controls the equalizer pressure of TEV.
• Evaporator may flood if the TEV is adjusted first.
• EPR controls the compressor suction pressure.

d. TEV affects the pressure setting of the EPR. - CORRECT ANSWER: A

A properly designed evaporator coil with multiple fans is icing in one area more rapidly than in the rest of the coil. Which statement correctly identifies the possible problem and solution?

• A higher air velocity passing across that area of the coil; reduce the fan rpm.
• A lower refrigerant evaporating pressure in that portion of the coil; readjust the

evaporator pressure regulator valve.

• A burned-out evaporator fan motor; replace the motor.
• Flooded refrigerant in that area of the coil; recircuit the coil. - CORRECT ANSWER: C

A refrigeration system should be evacuated down to what level and why?

• 500 microns to dehydrate the system.
• 500 microns to remove all moisture from POE oil.
• 29 in. Hg. Of vacuum to remove non-condensables.
• 29in. Hg. Of vacuum to remove all moisture from the system. - CORRECT ANSWER:

A

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A set of refrigeration lines is to be run diagonally across the roof from the merchandiser to the machine room. Using the illustration below, how many total feet of pipe would be required if there are 15 ft risers at both ends?

• 50 ft.
• 65 ft.
• 80 ft.

d. 100 ft. - CORRECT ANSWER: C

A technician finds a screw-in type fusible plug leaking through the solder hole on a receiver tank. How should the technician handle this problem?

• Repair the hole using a high silver content brazing rod.
• Replace with a properly sized pipe plug.
• Repair the hole using a low silver content brazing rod.

d. Replace with new fusible plug. - CORRECT ANSWER: D

A thermistor changes its:

• Resistance in relationship to temperature changes.
• Temperature in relationship to resistance changes.
• Voltage in relationship to current changes.

d. Current in relationship to temperature changes. - CORRECT ANSWER: A

A transformer rated at 40 VA at 24 volts output has a maximum capacity of:

• 0.625 A.
• 0.960 A.
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