Nate Industry Competency Exam
Commercial Refrigeration Questions
And Answers 2025|2026 Verified
Graded A+ Already Passed!
To check the operating superheat of a thermostatic expansion valve, the
technician needs suction pressure and:
a. Return air temperature entering the evaporator.
b. Liquid line temperature at the thermostatic expansion valve.
c. Suction gas temperature at the thermostatic expansion valve bulb.
d. Discharge air temperature leaving an evaporator. - CORRECT
ANSWER-C
To obtain a definite indication of whether or not an evaporator is fully
utilized, the technician should check:
a. Superheat.
b. Subcooling.
c. Suction pressure.
,d. The evaporator delta T. - CORRECT ANSWER-A
What is likely to cause liquid refrigerant to enter the compressor in a
thermostatic expansion valve (TEV) system?
a. TEV bulb lost charge.
b. High superheat.
c. No superheat.
d. Refrigerant undercharge. - CORRECT ANSWER-C
The correct location of the thermostatic expansion valve bulb on a 1
1/8" OD horizontal suction line out of an evaporator is on the:
a. Bottom of the suction header.
b. Bottom of the suction line after the suction header.
c. Side of the suction header.
d. Side of the suction line after the suction header. - CORRECT ANSWER-
D
,When charging a R-400 series refrigerant into a system with an
operating compressor, the technician should charge:
a. Liquid through the compressor suction service valve.
b. Liquid through a metering valve into the suction service valve.
c. Vapor through the compressor suction service valve.
d. Vapor through the suction and discharge service valves at the same
time. - CORRECT ANSWER-B
What is the ideal leaving water temperature of a water cooled
condenser for an ice machine?
a. 80°F.
b. 110°F.
c. 140°F.
d. 160°F. - CORRECT ANSWER-B
Inadequate airflow across the evaporator of a walk-in cooler may
damage the compressor due to:
, a. High discharge pressure.
b. High suction temperature.
c. Liquid floodback.
d. Increased system superheat. - CORRECT ANSWER-C
When the temperature at the sensing bulb of a thermostatic expansion
valve increases, the valve:
a. Opens to maintain superheat.
b. Opens and superheat decreases.
c. Closes and superheat decreases.
d. Closes to maintain superheat. - CORRECT ANSWER-B
When a thermostatic expansion valve is used, as the load on the
evaporator increases, the refrigerant flow:
a. Increases and suction pressure increases.
b. Increases and suction pressure decreases.
c. Decreases and suction pressure decreases.
d. Decreases and suction pressure increases. - CORRECT ANSWER-A
Commercial Refrigeration Questions
And Answers 2025|2026 Verified
Graded A+ Already Passed!
To check the operating superheat of a thermostatic expansion valve, the
technician needs suction pressure and:
a. Return air temperature entering the evaporator.
b. Liquid line temperature at the thermostatic expansion valve.
c. Suction gas temperature at the thermostatic expansion valve bulb.
d. Discharge air temperature leaving an evaporator. - CORRECT
ANSWER-C
To obtain a definite indication of whether or not an evaporator is fully
utilized, the technician should check:
a. Superheat.
b. Subcooling.
c. Suction pressure.
,d. The evaporator delta T. - CORRECT ANSWER-A
What is likely to cause liquid refrigerant to enter the compressor in a
thermostatic expansion valve (TEV) system?
a. TEV bulb lost charge.
b. High superheat.
c. No superheat.
d. Refrigerant undercharge. - CORRECT ANSWER-C
The correct location of the thermostatic expansion valve bulb on a 1
1/8" OD horizontal suction line out of an evaporator is on the:
a. Bottom of the suction header.
b. Bottom of the suction line after the suction header.
c. Side of the suction header.
d. Side of the suction line after the suction header. - CORRECT ANSWER-
D
,When charging a R-400 series refrigerant into a system with an
operating compressor, the technician should charge:
a. Liquid through the compressor suction service valve.
b. Liquid through a metering valve into the suction service valve.
c. Vapor through the compressor suction service valve.
d. Vapor through the suction and discharge service valves at the same
time. - CORRECT ANSWER-B
What is the ideal leaving water temperature of a water cooled
condenser for an ice machine?
a. 80°F.
b. 110°F.
c. 140°F.
d. 160°F. - CORRECT ANSWER-B
Inadequate airflow across the evaporator of a walk-in cooler may
damage the compressor due to:
, a. High discharge pressure.
b. High suction temperature.
c. Liquid floodback.
d. Increased system superheat. - CORRECT ANSWER-C
When the temperature at the sensing bulb of a thermostatic expansion
valve increases, the valve:
a. Opens to maintain superheat.
b. Opens and superheat decreases.
c. Closes and superheat decreases.
d. Closes to maintain superheat. - CORRECT ANSWER-B
When a thermostatic expansion valve is used, as the load on the
evaporator increases, the refrigerant flow:
a. Increases and suction pressure increases.
b. Increases and suction pressure decreases.
c. Decreases and suction pressure decreases.
d. Decreases and suction pressure increases. - CORRECT ANSWER-A
