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100+ Free NV C-1F Heating and Air Practice Questions

Prepare for the Nevada C-1F Heating, Cooling and Circulating Air Contractor Examination exam with instant access — no signup required.

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2026 Statistics

Key Facts: NV C-1F Heating and Air Exam

30 Q

Official Exam Questions

PSI Nevada Contractor CIB updated 3/25/2026

70%

Passing Score

PSI Nevada Contractor CIB updated 3/25/2026

1 hour

Time Allowed

PSI Nevada Contractor CIB updated 3/25/2026

USD 95

PSI Exam Fee (one portion)

PSI Nevada Contractor CIB updated 3/25/2026

Open Book

Book Policy

PSI Nevada Contractor CIB updated 3/25/2026

Nevada C-1F Heating, Cooling and Circulating Air Contractor Examination is the official NSCB/PSI open book exam: 30 questions, 70% (21 of 30 points), 1 hour, USD 95 (bulletin 270, updated 3/25/2026). Official delivery: English.

Sample NV C-1F Heating and Air Practice Questions

Try these sample questions to test your NV C-1F Heating and Air exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Per the 2018 UMC fuel-gas rules allowed on the Nevada C-1F exam, which test medium is prohibited when pressure-testing new gas piping?
A.Dry air
B.Nitrogen
C.Carbon dioxide
D.Oxygen
Explanation: UMC Chapter 13 (NFPA 54) requires air, nitrogen, carbon dioxide, or another inert gas. Oxygen is prohibited because it supports combustion and can turn residual oil or debris in the pipe into a fire or explosion hazard. PSI C-1F candidates should isolate the meter, cap outlets, and never introduce oxygen.
2After a fuel-gas piping system is pressurized, the accepted field method to locate a leak is which of the following?
A.Pass an open flame along each joint until the flame lengthens
B.Strike each fitting with a hammer and listen for a change in pitch
C.Open every appliance valve and smell for odorant at the burner
D.Apply a noncorrosive leak-detection solution and watch for bubbles
Explanation: A listed leak-detection solution (or equivalent soap solution that will not corrode the pipe) is applied to joints while the system is under test or operating pressure; bubbles mark the leak. An open flame is a fire and explosion hazard and is never an accepted test method. Smell-only checks miss small leaks and do not pinpoint joints.
3Carbon monoxide from a gas-fired warm-air furnace is produced primarily by which condition?
A.Complete combustion with excess outdoor air
B.A high-limit switch that opens on a temperature rise
C.A listed Type B vent with the required 1 inch clearance
D.Incomplete combustion from a cracked heat exchanger, blocked vent, or starved burner
Explanation: Carbon monoxide is a product of incomplete combustion. Typical furnace causes are a cracked heat exchanger leaking flue gas into the circulating air, a blocked or disconnected vent, flame rollout, or combustion air starvation. Complete combustion with proper venting produces mainly carbon dioxide and water vapor, not CO.
4Before opening a gas train, replacing a circulating pump, or working on an electrically powered furnace blower, the C-1F mechanic's first safety step is to:
A.Increase thermostat setpoint so residual heat is used up
B.Bypass the high-limit so the unit cannot cycle during the repair
C.Open a window and leave the unit running so CO is diluted
D.Lock out and tag the electrical disconnect and close the appliance fuel shutoff
Explanation: Energy isolation comes first: open the equipment disconnect, apply a lock and tag, and close the appliance fuel shutoff so the unit cannot start or leak gas while it is apart. Bypassing safeties or leaving equipment running during service is how burn, shock, and CO incidents occur.
5Clearance from a listed warm-air furnace, unit heater, or vent connector to combustible construction is determined first by which source?
A.A uniform 18 inch rule for every gas appliance
B.The C-1F license classification, which sets a 6 inch statewide clearance
C.Whatever clearance the existing building already provides
D.The appliance or vent listing and the manufacturer's installation instructions, then the 2018 UMC
Explanation: UMC Chapter 3 and Chapter 9 require listed appliances to be installed per their listing and the manufacturer's instructions. Those documents set the minimum clearance to combustibles; the code fills gaps and forbids reductions except where a listed reduction method is used. Existing tight installations do not grandfather a new or replacement unit.
6A Category I furnace is being started in a tight mechanical closet after weatherization sealed the building. The most important safety check before firing is that:
A.The thermostat anticipator is set to 1.0 ampere
B.The evaporator coil is charged to nameplate superheat
C.The gas meter index is turning even with all appliance valves closed
D.Required combustion air volume or outdoor openings are provided so the burner is not starved
Explanation: Tight rooms and sealed buildings commonly starve atmospheric burners, causing rollout, spillage at the draft hood, and carbon monoxide. Confirm indoor volume (50 cubic feet per 1,000 Btu/h) or the Chapter 7 outdoor openings before lighting. Refrigerant charge is C-21 work and is outside the C-1F scope.
7When a new fuel-gas piping system is placed in service, residual air must be purged. The 2018 UMC / NFPA 54 practice is to discharge the purge:
A.Into the furnace heat exchanger so the inducer can dilute it
B.Into a return-air plenum so the blower mixes it below the lower explosive limit
C.Through a lighted burner so any gas is immediately consumed
D.To a safe outdoor location, away from ignition sources and openings into the building
Explanation: Purging sends a flammable air-gas mixture out of the pipe. That mixture must be discharged outdoors, clear of ignition sources and building openings, until a stable combustible gas is detected at the purge point. Purging into a heat exchanger, return duct, or lighted burner can create an explosion inside the occupied space.
8A replacement gas furnace is installed in a residential garage. In addition to vehicle-protection and elevation rules, the unit must have which electrical safety feature at the appliance?
A.A lighting outlet only, with the disconnect at the electric meter
B.A GFCI receptacle in lieu of an equipment disconnect
C.A 30-amp fuse in the thermostat cable
D.A readily accessible disconnecting means in sight of the appliance, as required for the equipment
Explanation: Furnaces and similar HVAC equipment require a readily accessible disconnecting means within sight of the appliance so a service mechanic can kill power without hunting a remote panel. A thermostat fuse does not isolate line voltage. Garage elevation and bollard/curb protection are separate UMC/IRC vehicle-impact rules.
9A homeowner reports headaches whenever the furnace runs. The circulating air smells of exhaust, the flame wavers when the blower starts, and a CO detector near the supply register alarms. The most likely equipment failure is:
A.A dirty evaporator coil starving refrigerant flow
B.An oversized Type B vent that is slightly cool
C.A clogged evaporative-cooler pad on the same roof
D.A cracked heat exchanger allowing flue gas into the circulating-air stream
Explanation: Flame disturbance when the blower starts and CO in the supply air are classic cracked-heat-exchanger symptoms: the circulating fan pulls combustion products through the crack. The unit must be shut down, the building ventilated, and the exchanger inspected or replaced. This is a life-safety failure, not a comfort complaint.
10A mechanical room houses a 100,000 Btu/h atmospheric furnace. A new 400 cfm kitchen exhaust is added with no makeup air. The principal combustion-air hazard is that the exhaust can:
A.Increase indoor volume above the 50 cubic feet per 1,000 Btu/h threshold
B.Raise the furnace temperature rise and trip only the fan switch
C.Convert the furnace to a Category IV condensing appliance
D.Depressurize the room so the furnace backdrafts and spills flue gas at the draft hood
Explanation: Powered exhaust without makeup air can pull the mechanical room negative. A Category I draft-hood appliance then spills at the hood instead of venting, putting CO into the building. UMC Chapter 7 requires makeup air so exhaust does not interfere with combustion. Indoor volume is not increased by adding exhaust.

About the NV C-1F Heating and Air Exam

The Nevada C-1F Heating, Cooling and Circulating Air Contractor Examination is the official Nevada State Contractors Board trade or management examination administered by PSI Services LLC. The official exam has 30 scored questions. Passing is 70% (21 of 30 points) in 1 hour. The examination is open book. Approved center references include Uniform Mechanical Code, 2018 (allowed in center). PSI lists USD 95 for one examination portion and USD 140 if taken with CMS; otherwise USD 95 per trade exam (Candidate Information Bulletin updated 3/25/2026). NSCB requires a separate CMS examination for most new applicants, plus a USD 300 application fee and a USD 600 biennial license fee. This English-language MCQ bank is a study aid, not an official PSI form. It does not replace required trade experience, board approval, fingerprints, bonding, or the official examination.

Assessment

Open Book computer-based multiple-choice. Uniform Mechanical Code, 2018 (allowed in center)

Time Limit

1 hour

Passing Score

70% (21 of 30 points)

Exam Fee

USD 95 (PSI Services LLC (for the Nevada State Contractors Board))

NV C-1F Heating and Air Exam Content Outline

10%

Safety

HVAC safety (3 items)

30%

Piping

Heating piping (9 items)

33%

Equipment

Heating and evaporative-cooling equipment (10 items)

10%

Valves and Controls

Valves and controls (3 items)

17%

Ducts

Air-circulation ducts (5 items)

How to Pass the NV C-1F Heating and Air Exam

What You Need to Know

  • Passing score: 70% (21 of 30 points)
  • Assessment: Open Book computer-based multiple-choice. Uniform Mechanical Code, 2018 (allowed in center)
  • Time limit: 1 hour
  • Exam fee: USD 95

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

NV C-1F Heating and Air Study Tips from Top Performers

1Distribute study time to the official bulletin 270 content outline (updated 3/25/2026)
2Use only the PSI-listed references; temporary tabs such as Post-it notes are prohibited
3Confirm NSCB experience documentation before scheduling with PSI
4This bank is an English-language MCQ study aid, not an official PSI form

Frequently Asked Questions

How many questions are on the Nevada C-1F Heating, Cooling and Circulating Air Contractor Examination?

The official PSI examination has 30 scored questions. Passing is 70% (21 of 30 points) within 1 hour (Candidate Information Bulletin 270, updated 3/25/2026).

How much does the NV C-1F Heating and Air exam cost?

PSI lists USD 95 for one examination portion. Two portions cost USD 140 only if the second portion is CMS. NSCB charges a separate USD 300 application fee and USD 600 biennial license fee.

Is the NV C-1F Heating and Air exam open book?

Yes. PSI lists this examination as open book. Uniform Mechanical Code, 2018 (allowed in center)

Do I still need the CMS examination?

CMS is the required Nevada business-and-law examination. Most new applicants must pass CMS and a trade examination for the requested classification. In most cases you will not retake an exam if you have actively served as a qualified employee in the same classification within the last four years.