NATE INDUSTRY COMPETENCY EXAM
COMMERCIAL REFRIGERATION LATEST EXAM
2025-2026 ACTUAL EXAM 100 QUESTIONS AND
CORRECT DETAILED ANSWERS) |ALREADY GRADED
A+
Overview:
This latest edition features 100 exam-style questions that align with the official NATE
Commercial Refrigeration standards. The inclusion of detailed verified answers makes it not
just a practice test but also a learning guide, offering valuable insights into troubleshooting,
diagnostics, installation, and maintenance.
Key Features:
100 up-to-date exam questions modeled after the NATE certification format.
Verified correct answers with detailed explanations for better comprehension.
Focus on commercial refrigeration systems, including components, controls, and safety.
Reflects the latest 2025–2026 HVACR standards and industry practices.
Serves as both a test bank and a study guide for maximum exam readiness.
Purpose:
To prepare technicians for the NATE Commercial Refrigeration Certification Exam.
To strengthen technical knowledge through detailed rationales and explanations.
To boost confidence and ensure success on exam day with a graded A+ resource.
Recommended For:
HVACR professionals specializing in commercial refrigeration.
Technicians preparing for NATE certification exams.
Apprentices and advanced learners aiming to improve technical expertise.
Employers and training programs seeking reliable certification prep material.
With the condensing pressure and compressor speed remaining constant, a decrease in suction pressure
will cause a(n):
a. Decrease in compressor capacity and decrease in current.
b. Increase in compressor capacity and decrease in current.
c. Increase in compressor capacity and increase in current.
d. Decrease in compressor capacity and increase in current. - ANSWER-D
,An indication of non-condensable gas in a refrigeration system is significantly:
a. Lower-than-normal suction pressures.
b. higher-than-normal suction pressures.
c. Lower-than-normal head pressures.
d. higher-than-normal head pressures. - ANSWER-D
An automatic expansion valve controls refrigerant flow to an evaporator by maintaining a constant: a.
Suction pressure.
b. Pressure differential across the valve port.
c. Liquid line pressure.
d. Superheat. - ANSWER-A
What is the approximate compression ratio of a compressor operating at 35 psig suction pressure and
135 psig discharge pressure?
a. 1:03.
b. 3:01.
c. 1:04.
d. 4:01. - ANSWER-B
The BTUs rejected at the condenser are always greater than the heat absorbed in the evaporator
because:
a. The condenser is mounted outside with restricted airflow.
b. Of the high temperature of the discharge vapor and length of the discharge line.
c. Of the inefficiency of the condenser and pressure drop in the discharge line.
d. Of the heat of compression in the compressor. - ANSWER-D
A unit cooler is inspected and found to be completely iced up. The heaters and defrost timer are found
to be working properly. A technician should:
a. Adjust the defrost termination switch to a higher temperature setting.
, b. Adjust the thermostatic expansion valve to a higher superheat setting.
c. Clear all of the ice from the coil and find out why the coil is frosted.
d. Increase the frequency of the defrost cycle. - ANSWER-A
what is the correct gauge pressure corresponding to an absolute pressure of 24.7 psia at sea level? a.
10 psig.
b. 12.6 psig.
c. 39.4 psig.
d. 39.7 psig. - ANSWER-A
For a lineup of medium temperature case, an evaporator temperature 0f 23°F is needed. The following
conditions exist:
· The suction line pressure drop is equivalent to approximately 2°F.
· The liquid line pressure drop is equivalent to 1°F.
The compressor capacity should be selected based on a saturated suction temperature of: a.
20°F.
b. 21°F.
c. 23°F.
d. 25°F. - ANSWER-B
What is true of systems with multiple evaporators at different temperatures?
a. It is required to install evaporator pressure regulator(s).
b. The compressor discharge pressure will be a function of the coldest space.
c. It is required to install a head pressure control valve.
d. It is required to install a crankcase pressure regulator. - ANSWER-A
If charging a system by subcooling, what metering devices is installed?
a. Capillary tube.
b. Restrictor.
COMMERCIAL REFRIGERATION LATEST EXAM
2025-2026 ACTUAL EXAM 100 QUESTIONS AND
CORRECT DETAILED ANSWERS) |ALREADY GRADED
A+
Overview:
This latest edition features 100 exam-style questions that align with the official NATE
Commercial Refrigeration standards. The inclusion of detailed verified answers makes it not
just a practice test but also a learning guide, offering valuable insights into troubleshooting,
diagnostics, installation, and maintenance.
Key Features:
100 up-to-date exam questions modeled after the NATE certification format.
Verified correct answers with detailed explanations for better comprehension.
Focus on commercial refrigeration systems, including components, controls, and safety.
Reflects the latest 2025–2026 HVACR standards and industry practices.
Serves as both a test bank and a study guide for maximum exam readiness.
Purpose:
To prepare technicians for the NATE Commercial Refrigeration Certification Exam.
To strengthen technical knowledge through detailed rationales and explanations.
To boost confidence and ensure success on exam day with a graded A+ resource.
Recommended For:
HVACR professionals specializing in commercial refrigeration.
Technicians preparing for NATE certification exams.
Apprentices and advanced learners aiming to improve technical expertise.
Employers and training programs seeking reliable certification prep material.
With the condensing pressure and compressor speed remaining constant, a decrease in suction pressure
will cause a(n):
a. Decrease in compressor capacity and decrease in current.
b. Increase in compressor capacity and decrease in current.
c. Increase in compressor capacity and increase in current.
d. Decrease in compressor capacity and increase in current. - ANSWER-D
,An indication of non-condensable gas in a refrigeration system is significantly:
a. Lower-than-normal suction pressures.
b. higher-than-normal suction pressures.
c. Lower-than-normal head pressures.
d. higher-than-normal head pressures. - ANSWER-D
An automatic expansion valve controls refrigerant flow to an evaporator by maintaining a constant: a.
Suction pressure.
b. Pressure differential across the valve port.
c. Liquid line pressure.
d. Superheat. - ANSWER-A
What is the approximate compression ratio of a compressor operating at 35 psig suction pressure and
135 psig discharge pressure?
a. 1:03.
b. 3:01.
c. 1:04.
d. 4:01. - ANSWER-B
The BTUs rejected at the condenser are always greater than the heat absorbed in the evaporator
because:
a. The condenser is mounted outside with restricted airflow.
b. Of the high temperature of the discharge vapor and length of the discharge line.
c. Of the inefficiency of the condenser and pressure drop in the discharge line.
d. Of the heat of compression in the compressor. - ANSWER-D
A unit cooler is inspected and found to be completely iced up. The heaters and defrost timer are found
to be working properly. A technician should:
a. Adjust the defrost termination switch to a higher temperature setting.
, b. Adjust the thermostatic expansion valve to a higher superheat setting.
c. Clear all of the ice from the coil and find out why the coil is frosted.
d. Increase the frequency of the defrost cycle. - ANSWER-A
what is the correct gauge pressure corresponding to an absolute pressure of 24.7 psia at sea level? a.
10 psig.
b. 12.6 psig.
c. 39.4 psig.
d. 39.7 psig. - ANSWER-A
For a lineup of medium temperature case, an evaporator temperature 0f 23°F is needed. The following
conditions exist:
· The suction line pressure drop is equivalent to approximately 2°F.
· The liquid line pressure drop is equivalent to 1°F.
The compressor capacity should be selected based on a saturated suction temperature of: a.
20°F.
b. 21°F.
c. 23°F.
d. 25°F. - ANSWER-B
What is true of systems with multiple evaporators at different temperatures?
a. It is required to install evaporator pressure regulator(s).
b. The compressor discharge pressure will be a function of the coldest space.
c. It is required to install a head pressure control valve.
d. It is required to install a crankcase pressure regulator. - ANSWER-A
If charging a system by subcooling, what metering devices is installed?
a. Capillary tube.
b. Restrictor.
