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AZ ROC C-39 Air Conditioning and Refrigeration Practice Questions - Arizona ROC C-39 CR-39 R-39R Air Conditioning and Refrigeration Examination Exam

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About this Exam

Prepare with the AZ ROC C-39 Air Conditioning and Refrigeration Practice Questions - Arizona ROC C-39 CR-39 R-39R Air Conditioning and Refrigeration Examination Exam practice quiz. This question bank includes 100 questions covering pressure, temperature, commercial, compressor, and control. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

Sample Questions

Question 1
An HVAC technician is troubleshooting an R-410A commercial split system. The liquid line gauge pressure reads 318 psig (corresponding to a saturated condensing temperature of 100°F), and the measured liquid line temperature at the outlet of the condenser coil is 88°F. What is the system subcooling, and what does this indicate if the manufacturer design subcooling is 12°F?
Subcooling is 6°F; the system is undercharged or has a metering valve over-feeding.
Subcooling is 12°F; the system subcooling matches manufacturer specification exactly.
Subcooling is 18°F; the system has a non-condensable gas or severe restriction.
Subcooling is 24°F; the condenser coil is severely fouled or overcharged.
Question 2
A walk-in cooler operating on R-404A has a suction pressure of 58 psig (saturated evaporator temperature of 25°F). The measured suction line temperature 6 inches downstream of the evaporator bulb attachment point is 41°F. What is the operating evaporator superheat?
8°F
16°F
24°F
33°F
Question 3
Under EPA Section 608 regulations, what level of evacuation must be achieved when disposing of or majorly servicing a high-pressure commercial appliance containing 250 lbs of R-134a using recovery equipment manufactured after November 15, 1993?
0 psig (atmospheric pressure)
4 inches of Hg vacuum
15 inches of Hg vacuum
10 inches of Hg vacuum
Question 4
When mounting a Thermostatic Expansion Valve (TEV) sensing bulb on a horizontal suction line with an outside diameter of 1-1/8 inches, what is the proper clock position for the bulb attachment?
At the 4 o'clock or 8 o'clock position
Directly on top of the pipe at the 12 o'clock position
Directly at the bottom of the pipe at the 6 o'clock position
Outside the insulated sleeve exposed to ambient air
Question 5
What is the primary function of a compressor crankcase heater in a commercial air conditioning or refrigeration system?
To increase discharge gas superheat during normal compressor operation
To heat the suction gas prior to entering the compressor cylinders to boost volumetric efficiency
To prevent liquid refrigerant migration to compressor crankcase oil during the off-cycle
To melt ice accumulation on the compressor shell during low-ambient cooling

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Additional Information

AZ ROC C-39 Air Conditioning and Refrigeration Practice Questions - Arizona ROC C-39 CR-39 R-39R Air Conditioning and Refrigeration Examination Exam

This practice set contains 100 questions from the matching question bank and focuses on pressure, temperature, commercial, compressor, and control. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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Frequently Asked Questions

This quiz contains a total of 100 practice questions carefully selected to test your knowledge on this subject.
Yes, you will have exactly 0 minutes to complete the exam. A countdown timer will be visible once you start.
Yes, you can retake this practice test as many times as you need. The questions and options may be randomized on subsequent attempts to ensure comprehensive learning.

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