NV C-21 Refrigeration and Air Conditioning Practice Questions - Nevada C-21 Refrigeration and Air Conditioning Contractor Examination Exam - NV C-21 Refrigeration and Air Conditioning Practice Questions - Nevada C-21 Refrigeration and Air Conditioning Contractor Examination Exam

Question 1

Copper tube erected on the premises for a Nevada C-21 refrigerant circuit shall be which product?

Seamless Type ACR copper tube complying with ASTM B280 (or a listed ACR equivalent) Type DWV copper drainage tube Type M water tube joined with 50-50 solder Soft polyethylene irrigation tubing

Correct Answer:

Seamless Type ACR copper tube complying with ASTM B280 (or a listed ACR equivalent)

Question 2

While brazing a copper ACR joint on a C-21 split-system line set, a dry nitrogen purge is used primarily to:

Increase the braze melting temperature so the joint cools faster Pressurize the system to the high-side relief setting during the braze Keep oxygen out of the tube so copper-oxide scale does not form inside the circuit Replace the need for a post-braze pressure test

Correct Answer:

Keep oxygen out of the tube so copper-oxide scale does not form inside the circuit

Question 3

Field-erected refrigerant pipe joints on a C-21 system shall be:

Left exposed for visual inspection and testing before they are covered or enclosed Insulated and buried before anyone inspects them so the jacket is not delayed Painted with aluminum paint in lieu of a pressure test Soft-soldered with 50-50 plumber's solder when the refrigerant is Group A2 or A3

Correct Answer:

Left exposed for visual inspection and testing before they are covered or enclosed

Question 4

Per UMC 2018 Chapter 11, a positive-displacement C-21 system containing more than 6.6 pounds of refrigerant shall have stop valves:

Only at the liquid-receiver drain Nowhere; stop valves are prohibited on refrigerant lines Only on the condenser water piping At the inlet and discharge of each compressor, compressor unit, or condensing unit, and at each liquid receiver (with listed exceptions)

Correct Answer:

At the inlet and discharge of each compressor, compressor unit, or condensing unit, and at each liquid receiver (with listed exceptions)

Question 5

A field-erected C-21 refrigeration system shall be pressure-tested on:

The high-pressure side only The low-pressure side only Both the high- and low-pressure sides, at not less than the lower of the design pressure or the relief-device setting (with listed factory-tested exceptions) Neither side if the compressor nameplate is present

Correct Answer:

Both the high- and low-pressure sides, at not less than the lower of the design pressure or the relief-device setting (with listed factory-tested exceptions)

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About this Exam

Prepare with the NV C-21 Refrigeration and Air Conditioning Practice Questions - Nevada C-21 Refrigeration and Air Conditioning Contractor Examination Exam practice quiz. This question bank includes 100 questions covering c-21, refrigerant, unit, temperature, and furnace. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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NV C-21 Refrigeration and Air Conditioning Practice Questions - Nevada C-21 Refrigeration and Air Conditioning Contractor Examination Exam

This practice set contains 100 questions from the matching question bank and focuses on c-21, refrigerant, unit, temperature, and furnace. 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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NV C-21 Refrigeration and Air Conditioning Practice Questions - Nevada C-21 Refrigeration and Air Conditioning Contractor Examination Exam

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