Exam Cheat Sheet · Quick Reference
Oklahoma - HVACR CONTRACTOR UNLIMITED
Oklahoma · PSI Services Contractor
Verified, not estimated. Every figure below is drawn from the official exam structure we maintain — question counts, passing standard and topic weighting. Practice questions are grounded in the source law with statute citations. We omit any figure we can't verify rather than guess at it.
Total questions
90
Passing score
70%
Exam time
240 min
Administered by
PSI Services Contractor
Format
Reference materials allowed
Oklahoma State Portion 90 questions
Electrical Knowledge and Controls
15 Q · 17%
Ohm's Law, Watt's Law, and basic circuit calculations (series, parallel, series-parallel)Pictorial and ladder wiring diagrams for HVACR systemsControl system fundamentals: range and differential adjustment, cut-in and cut-out settingsTemperature motor controls: sensing bulbs, bimetal devices, and electronic thermistor sensorsPressure motor controls: high-pressure, low-pressure, oil pressure, and low-pressure safety controlsMotor starting relays: current relays, potential relays, solid-state relays, and PTC relaysContactors and motor starters for single-phase and three-phase motorsMotor protection devices: fuses (fast-acting, time-delay, multipurpose, current-limiting), circuit breakers, and bimetal protection
Natural Gas
12 Q · 13%
Gas piping materials, fittings, and allowable pipe types (steel, copper, CSST, polyethylene)Gas piping sizing methods: longest length, branch length, and hybrid pressure methodsAllowable pressure drop and maximum operating pressure in gas piping systemsCombustion air requirements: indoor, outdoor, and combination methods with sizing calculationsVenting system types and appliance categories (Category I–IV, Type B, Type BW, Type L vents)Chimney and vent connector installation, sizing, clearances, and termination requirementsGas appliance combustion: fuel properties, air-fuel ratios, flame characteristics, and incomplete combustionGas furnace ignition systems, safety controls, and combustion efficiency testing
Air Distribution Systems
25 Q · 28%
Duct system types and configurations (radial, extended plenum, reducing trunk, perimeter loop, SDHV)Duct construction materials, gauges, and joining methodsDuct sizing procedures and ACCA Manual D requirements (IMC 603.2)Registers, diffusers, grilles, and damper types and applicationsDuct insulation requirements, vapor retarders, and flame/smoke ratings (IMC Chapter 6)Ventilation rates, air changes per hour calculations, and outdoor air requirements (IMC Chapter 4)Exhaust system requirements by occupancy and application (IMC Chapter 5)Airflow measurement, system balancing, and duct leakage testing
Refrigeration and Air Conditioning Systems
20 Q · 22%
Compression refrigeration cycle operation and componentsMetering devices: types, selection, and operationCompressor types, drive configurations, and safety componentsHeat exchangers: evaporator and condenser types and defrost methodsRefrigerant classification, environmental regulations, and handling proceduresRefrigerant system service: charging, recovery, evacuation, and leak detectionHeat pump operation, components, and reversing valve functionCommercial refrigeration system configurations and troubleshooting
Heating Systems
15 Q · 17%
Gas-fired heating system components and operation (burners, gas valves, ignition systems, heat exchangers)Oil-fired heating system components and combustion efficiency testing (CO2, stack temperature, draft, smoke tests)Hydronic heating system components, designs, and controls (boilers, pumps, expansion tanks, piping configurations)Electric resistance heating systems (furnaces, duct heaters, baseboard units, heating elements)Heating and cooling load calculations (heat transfer, R/U/C/K values, Manual J method, design temperatures)Thermostat types, controls, and zoned system operationChimneys, vents, and combustion appliance venting requirements (IFGC/IMC code compliance)Solar heating systems and supplementary heat sources
Safety
3 Q · 3%
OSHA regulations and employer reporting requirementsLockout/tagout (LOTO) procedures for electrical safetyFire hazard identification and fire extinguisher use (P.A.S.S.)Refrigerant cylinder handling, storage, and pressure safetySafety Data Sheets (SDS) and Globally Harmonized System (GHS) labelingPersonal protective equipment (PPE) selection and useSafe work practices for ladders, scaffolding, and fall protectionConfined space entry hazards and precautions