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NATE Industry Competency Exam: Commercial Refrigeration
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The NATE Commercial Refrigeration Industry Competency Exam (ICE) tests technicians on installation, service, and maintenance of specialized cooling systems, focusing on refrigeration cycles, electrical troubleshooting, and component diagnostics. Key topics include high/low-pressure controls, defrost systems, compressors, refrigerant management, and proper piping techniques.  Key Topics in Commercial Refrigeration (Service Focus): Refrigeration Cycle Components: Detailed knowledge of compressors (reciprocating, scroll), evaporators, condensers, and expansion devices (TXV, AXV). System... Show more
NATE Industry Competency Exam: Commercial Refrigeration
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25 Questions

1. An electrical motor is designed to operate 120/240 volts. In using 120 volts, the current draw is 10 amperes. What would the current draw in using 240 volts?
2. What head pressure ranges would a technician expect to find during a freeze cycle of a water cooled condenser ice machine using R-404A refrigerant?
3. What is the approximate compression ratio of a compressor operating at 35 psig suction pressure and 135 psig discharge pressure?
4. The mullion heater in a refrigerated display case is primarily used to:
5. Compressor short cycling during the off cycle of a system equipped with a pumpdown control can be caused by a leaking:
6. To check compressor efficiency, it is essential to know what operating characteristic(s)?
7. 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:
8. The below remote condenser system is equipped with a head pressure control valve (HPCV) operating with the following conditions:
· Low head pressure
· 30°F ambient temperature.
· Receiver inlet warmer that ambient.
· Flash gas present at the receiver outlet.
What could cause the above conditions?
9. On an inside 30 lb. receiver with a safety-pressure relief device, the discharge of the safety device should be piped to the:
10. When an ice-thickness control is satisfied on a cube type ice maker it:
11. What occurs if one of the fuses in an operating three-phase motor circuit blows?
12. What are the two factors making up the safety classification for refrigerants?
13. An oil separator should be installed in a warm location so that refrigerant vapors in the separator will be less likely to:
14. The purpose of a crankcase heater is to:
15. An evaporator pressure regulator valve installed in the suction line is used to control the:
16. All CFC, HCFC, and HFC refrigerants may become a toxic gas if it comes in contact with:
17. Refrigerant cylinders should not be stored in sunlight, primarily because the:
18. An ice-cube machine builds up heavy scale deposits on the evaporator within 1 week. What should be done to prevent this problem?
19. In a low temperature system, frost on the exposed suction line always indicates that the:
20. On an electrical diagram, the below symbol represents a control that:
21. In a pump down system, the solenoid valve should be installed in the:
22. If, after warming of a restricted thermostatic expansion valve body and restarting of the system, the valve's superheat returns to normal, it is reasonable to assume that the restriction is due to:
23. The compressor on a water cooled cube-type ice machine is frosted and the unit is not producing ice. What should the technician do first?
24. In the circuit shown below, what is the best measure to verify that the compressor motor is grounded
25. 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:

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