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100+ Free SC Refrigeration Practice Questions

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2026 Statistics

Key Facts: SC Refrigeration Exam

50 Q

Official Exam Questions

PSI SC Commercial Contractor CIB updated 5/15/2025

70%

Passing Score

PSI SC Commercial Contractor CIB updated 5/15/2025

3 hours

Time Allowed

PSI SC Commercial Contractor CIB updated 5/15/2025

USD 75

PSI Exam Fee

PSI SC Commercial Contractor CIB updated 5/15/2025

Open Book

Book Policy

PSI SC Commercial Contractor CIB updated 5/15/2025

South Carolina Refrigeration Contractor Examination is the official CLB/PSI open-book exam: 50 questions, 70% (35 of 50), 3 hours, USD 75 (bulletin updated 5/15/2025). Official delivery is English.

Sample SC Refrigeration Practice Questions

Try these sample questions to test your SC Refrigeration exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Under the 2021 International Mechanical Code (IMC), when the quantity of refrigerant in an independent circuit exceeds the amount in Table 1103.1, refrigerant-containing components shall be located:
A.In any mechanical closet that has a louvered door to the occupied space
B.Either outdoors or in a machinery room constructed to Chapter 11
C.In the smallest occupied space served by the system
D.Above a suspended ceiling used as a return-air plenum
Explanation: IMC 1104.2 requires all refrigerant-containing components to be outdoors or in a machinery room when an independent circuit exceeds Table 1103.1. Machinery rooms for Group A1 and B1 refrigerants must meet Section 1105; Groups A2, B2, A3, and B3 must also meet Section 1106.
2A listed, factory-built condensing unit contains 5.5 lb of refrigerant. Does the 2021 IMC require a machinery room solely because of that charge?
A.Yes, any charge over 3 lb requires a machinery room
B.Yes, unless the refrigerant is Group A1
C.No, listed equipment with not more than 6.6 lb is exempt regardless of safety group when installed to its listing
D.No, because machinery rooms are required only for ammonia
Explanation: IMC 1104.2 Exception 1 states that machinery rooms are not required for listed equipment and appliances containing not more than 6.6 lb (3 kg) of refrigerant, regardless of the refrigerant's safety classification, when installed per the listing and the manufacturer's instructions.
3A new industrial refrigeration plant will use R-717 (ammonia). Which standards govern that system under the 2021 IMC?
A.IMC Chapter 11 in full, because ammonia is listed in Table 1103.1
B.IIAR 2, IIAR 3, IIAR 4, and IIAR 5; the system is not required to comply with IMC Chapter 11
C.ASHRAE 15 only, with no IIAR documents
D.The International Fuel Gas Code, because ammonia is treated as a fuel gas
Explanation: IMC 1101.1.2 states that refrigeration systems using ammonia shall comply with IIAR 2, 3, 4, and 5 and shall not be required to comply with Chapter 11. IMC 1107.1 likewise sends ammonia piping to IIAR 2.
4A supermarket rack with 280 lb of Group A1 refrigerant will be converted to a different A1 blend. What does IMC 1101.7 require before the refrigerant type is changed?
A.No notice is required if both refrigerants are Group A1
B.Prior notification to the code official and compliance with the provisions that apply to the new refrigerant
C.Only a manufacturer letter left in the equipment packet
D.Approval from EPA Section 609 instead of the building official
Explanation: IMC 1101.7 requires prior notification to the code official, and compliance with the code provisions for the new refrigerant, when changing the type of refrigerant in a circuit containing more than 220 lb of Group A1 or more than 30 lb of any other group.
5Outdoor refrigerant circuit access ports on a rooftop condensing unit that is reachable from an unlocked stair and ladder must be:
A.Left with standard plastic Schrader caps so gauges can be connected quickly
B.Fitted with locking-type tamper-resistant caps or otherwise secured against unauthorized access
C.Removed and the ports brazed shut after startup
D.Painted red and labeled only, without a locking cap
Explanation: IMC 1101.9 requires outdoor refrigerant circuit access ports to have locking-type tamper-resistant caps or be otherwise secured. The exception is only for equipment in controlled areas such as roofs with locked access hatches or doors.
6In an institutional occupancy (other than a kitchen, laboratory, or mortuary), how does the 2021 IMC treat the Table 1103.1 refrigerant quantities?
A.The table amounts are doubled because staff are always present
B.The table amounts are reduced by 50 percent, and the total of all Group A2, B2, A3, and B3 refrigerants shall not exceed 550 lb in occupied areas or machinery rooms
C.Institutional occupancies may use unlimited A1 refrigerant but no flammable refrigerant
D.Only ammonia is restricted; all fluorinated refrigerants use the unreduced table
Explanation: IMC 1104.2.1 reduces Table 1103.1 amounts by 50 percent in institutional occupancies except kitchens, laboratories, and mortuaries. It also caps the total of Group A2, B2, A3, and B3 refrigerants at 550 lb in occupied areas or machinery rooms, because occupants cannot leave without assistance.
7A technician wants to add a few pounds of a different ASHRAE 34 refrigerant blend into an existing circuit to 'top it off.' What does IMC 1102.2.1 require?
A.Any A1 refrigerants may be mixed freely
B.Refrigerants with different ASHRAE 34 designations shall not be mixed, except where the equipment manufacturer permits a specified second refrigerant to improve oil return
C.Mixing is allowed if the blend GWP is lower than the original charge
D.Mixing is allowed after the system is evacuated to 500 microns
Explanation: IMC 1102.2.1 prohibits mixing refrigerants, including blends, that have different ASHRAE 34 designations. The only exception is a manufacturer-permitted second refrigerant added in the specified amount to improve oil return at low temperatures.
8Recovered refrigerant may be reused in which of the following situations under IMC 1102.2.2.2, provided it is filtered and dried and is not clearly contaminated?
A.In any owner's equipment as long as the ASHRAE 34 designation matches
B.Only in the system from which it was recovered or in other systems of the same owner
C.Only after it is sold through a wholesaler as new product
D.In a different owner's system if a sight glass shows a clear liquid
Explanation: IMC 1102.2.2.2 limits recovered refrigerant to the system it came from or other systems of the same owner. It must be filtered and dried. Contaminated recovered refrigerant must be reclaimed to AHRI 700 (1102.2.2.3) before any reuse, and a different owner requires AHRI 700 reclaim.
9Which refrigeration system type is classified as a high-probability system under IMC 1103.3?
A.A double-indirect open-spray system with isolated refrigerant piping
B.An indirect closed (chiller) system with the refrigerant confined to the machine room
C.A direct system in which the evaporator is in the occupied airstream
D.An indirect-vented closed system
Explanation: IMC 1103.3.2 classifies direct systems and indirect open-spray systems as high-probability because leaked refrigerant can readily enter an occupied area. Low-probability systems (1103.3.1) are double-indirect open-spray, indirect closed, and indirect-vented closed systems when refrigerant piping is isolated.
10A 20 ft by 25 ft refrigeration machinery room is occupied by two technicians. What minimum normal mechanical exhaust rate does IMC 1105.6.3.1 require based on the area/person rules (ignoring the separate 18°F temperature-rise check)?
A.40 cfm (20 cfm per person)
B.250 cfm (0.5 cfm per square foot)
C.500 cfm (1.0 cfm per square foot)
D.100 cfm (flat machinery-room minimum)
Explanation: IMC 1105.6.3.1 requires the larger of 0.5 cfm per square foot of machinery room area or 20 cfm per person during occupied conditions. Area = 500 ft² × 0.5 = 250 cfm; people = 2 × 20 = 40 cfm. The required value is 250 cfm. A separate check still requires enough air to limit room temperature rise to 18°F.

About the SC Refrigeration Exam

The South Carolina Refrigeration Contractor Examination is the official CLB classification examination administered by PSI. The official exam has 50 scored questions. Passing is 70% (35 of 50) in 3 hours. The examination is open book. PSI lists USD 75 (Candidate Information Bulletin updated 5/15/2025). Candidates must also pass Business Management and Law for Commercial Contractor. This bank is an English-language MCQ study adaptation. It does not replace required trade experience, board approval, or the official examination.

Assessment

Open-book computer-based multiple-choice. Allowed references include the 2021 IMC with SC modifications or 2018 SC Mechanical Code, OSHA 29 CFR 1926, Pipefitter's Handbook (3rd), Carrier System Design Manual Part III (1960), and Modern Refrigeration and Air Conditioning (21st or 22nd).

Time Limit

3 hours

Passing Score

70% (35 of 50)

Exam Fee

USD 75 (PSI Services LLC (for the South Carolina Contractor's Licensing Board))

SC Refrigeration Exam Content Outline

14%

Code Compliance

Code Compliance (7 items)

22%

HARV General

HARV General (11 items)

16%

HARV Maintenance

HARV Maintenance (8 items)

16%

HARV Controls

HARV Controls (8 items)

6%

Piping General

Piping - General (3 items)

18%

Piping Dimensioning and Design

Piping - Dimensioning and Design (9 items)

8%

Safety

Safety (4 items)

How to Pass the SC Refrigeration Exam

What You Need to Know

  • Passing score: 70% (35 of 50)
  • Assessment: Open-book computer-based multiple-choice. Allowed references include the 2021 IMC with SC modifications or 2018 SC Mechanical Code, OSHA 29 CFR 1926, Pipefitter's Handbook (3rd), Carrier System Design Manual Part III (1960), and Modern Refrigeration and Air Conditioning (21st or 22nd).
  • Time limit: 3 hours
  • Exam fee: USD 75

Keys to Passing

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

SC Refrigeration Study Tips from Top Performers

1Distribute study time to the official PSI content outline (bulletin updated 5/15/2025)
2Use only the PSI-listed references; temporary tabs such as Post-it notes are prohibited
3Pass Business Management and Law for Commercial Contractor in addition to this technical examination
4This bank is an English-language MCQ study aid, not an official PSI form

Frequently Asked Questions

How many questions are on the South Carolina Refrigeration Contractor Examination?

The official PSI examination has 50 scored questions. Passing is 70% (35 of 50) within 3 hours (Commercial Contractor Candidate Information Bulletin updated 5/15/2025).

How much does this PSI examination cost?

PSI lists USD 75 for this examination. The South Carolina Contractor's Licensing Board charges a separate USD 350 license application fee for general and mechanical contractor licenses.

Is this examination open book?

Yes. PSI lists the South Carolina commercial contractor examinations as open book. Listed references include the 2021 IMC or 2018 SC Mechanical Code and Modern Refrigeration and Air Conditioning.

Is Refrigeration the same as Air Conditioning in South Carolina?

No. PSI publishes a separate Refrigeration examination (50 questions, 3 hours, USD 75) with its own HARV and piping outline.