HVAC & Electrical Theory Tests

Free HVAC Heat Pump Practice Test 2. 25 questions covering heat pump installation costs, air handler CFM calculations, low-voltage compressor effects, heating and cooling mode heat flow, indoor coil evaporator function, outdoor heat sink, frost efficiency reduction, defrost cycle timing, auxiliary heat in defrost, defrost thermostat location, dual fuel hybrid systems, outdoor unit clearances, condensate drain requirements, refrigerant overcharge and undercharge symptoms, HSPF heating efficiency rating, ECM blower motor advantages, MERV filter ratings, thermostat wiring terminals, lock-out tag-out safety procedures, capacitor functions, and heat pump noise troubleshooting.

Free HVAC Heat Pump Practice Test 3. 25 questions on defrost thermostat operation at 32°F, outdoor air as heat source, minimum SEER requirements, HSPF ratings, hermetic compressors, refrigerant state between evaporator and compressor, reversing valve function, blower operation troubleshooting, 500-micron evacuation standard, poly-phase motor starters, vapor compression cycle, heat pump sizing, desuperheater operation, refrigerant migration prevention, and two-stage compressor advantages.

Free HVAC Heat Pump Practice Test 4. 25 questions covering refrigerant circulation direction, indoor coil as heat transfer surface, O-terminal cooling control, low-pressure gas between evaporator and compressor, heat pump high efficiency advantages, underground heat pump class requirements, voltmeter and thermostat troubleshooting, low-charge reversing valve diagnosis, incorrect thermostat wiring effects, reversing valve operational modes, refrigerant oil types, heat pump electrical safety, defrost board operation, auxiliary heat lockout settings, and refrigerant phase changes.

Free HVAC Heat Pump Practice Test 5. 25 questions on COP calculations, defrost thermostat positioning, auxiliary heat in defrost cycle, frost effect on efficiency, outdoor coil as condenser in cooling, heat direction in cooling mode, halogen leak detector sensitivity, voltage and current measurement, heat pump charging in cooling mode, unit capacity in 3+ ton heat pumps, zoning systems, mini-split ductless heat pumps, heat pump water heaters, geothermal basics, and heat pump installation codes.

Free HVAC Air Conditioning Practice Test 1. 25 questions on humidification, dew point, latent heat, return air ductwork, atmospheric pressure, altitude effects on pressure, absolute pressure, vaporization pressure, psychrometric readings, ASHRAE ventilation standards, sensible heat ratio, cooling coil selection, air-side economizer operation, cooling tower basics, and refrigerant circuit component identification.

Free HVAC Air Conditioning Practice Test 2. 25 questions covering latent heat and state changes, relative humidity ranges, Boyle's Law, refrigerant vapor compression, occupant ventilation requirements, air cleaning principles, ASHRAE comfort temperature index, human heat production, gas compression basics, minimum SEER standards, evaporative cooler operation, refrigerant compressor types, condenser water treatment, economizer controls, and cooling load calculation basics.

Free HVAC Air Conditioning Practice Test 3. 25 questions on evaporative cooling effects, cold water temperature ranges for cooling, compressor-generated pressure differences, head pressure relationship to horsepower, duct velocity and friction loss, BHP and RPM relationships, tons of refrigeration (1 ton = 12,000 BTU/hr), sensible heat and latent heat removal, sensible heat definition, Boyle's Law pressure-volume relationships, refrigerant contaminants, compressor lubrication, expansion valve operation, condenser sizing, and cooling coil dehumidification.

Free HVAC Air Conditioning Practice Test 4. 25 questions covering heat flow from hot to cold, sensible heat measurement with thermometers, dew point temperature, human heat production rates, most common gas compression methods, condenser water temperature differential, BHP and AHP relationship, low velocity and friction losses, series fan configurations, sensible heat removal effects, air distribution strategies, HVAC maintenance intervals, dehumidifier selection, refrigerant cylinder safety, and hydronic heating basics.

Free HVAC Controls Practice Test 1. 25 questions on pneumatic control systems, normally closed vs normally open control devices, controller-controlled device relationships, 4-20 mA current loops, primary control variables, thermocouple high-temperature applications, thermistor sensitivity, RTD positive temperature coefficient, wire length resistance effects, pitot tube air velocity measurement, PID control theory, DDC system advantages, control loop terminology, proportional band, and actuator types.

Free HVAC Controls & Sensors Practice Test 2. 25 questions covering thermistors, magnetic flow meters, Bourdon tube pressure sensors, ASHRAE humidity limits, thermopiles, self-powered VAV diffusers, capacitive humidity sensors, CO2 NDIR sensors, differential pressure transmitters, RTD wiring configurations, PIR occupancy sensors, velocity/static/total pressure relationships, duct pressure sensor placement, sensor calibration, and CO safety detection.

Free HVAC Controls & Sensors Practice Test 3. 25 questions on air pressure principles, on/off vs modulating control, HVAC control system benefits, controller-sensor relationships, analog vs digital sensors, non-contact sensing, voltage sensors, RTD types, sensor-transducer-transmitter assemblies, open-loop vs closed-loop control, BAS hierarchy levels, pneumatic thermostat operation, VAV box control sequences, dual-duct systems, and control valve authority.

Free HVAC Controls & Sensors Practice Test 4. 25 questions covering capillary temperature sensors, resistance-to-cross-sectional area relationships, thermocouple self-powered operation, ultrasonic transit-time flow measurement, electronic vs non-electronic sensors, dew point temperature, thermocouple millivolt output, bi-metallic temperature sensing, psychrometrics, PT100 RTD fundamentals, thermocouple types J and K, sensor dead band, diaphragm pressure sensors, vortex flow meters, and CO2 sensor demand-controlled ventilation.

Free HVAC Controls and Sensors Practice Test 5. 25 questions on RTD linear characteristics, capacitance fluid level sensing, RTD resistance behavior, chilled mirror hygrometers, dew point measurement, quartz crystal humidity sensors, magnetic flow meters, thermocouple selection, control valve flow characteristics, freeze stats, high-limit controls, AHU sequences, optimum start, zoning strategies, and chilled water pump differential pressure control.

Free HVAC Basic Electrical Practice Test 1. 25 questions on fundamental electrical concepts including conductance (mho), battery DC output, ammeter current measurement, Ohm's Law, fuse sizing, resistance as current opposition, ohmmeter operation, capacitor parallel circuits, voltmeter readings, parallel circuit current, power factor, single-phase vs three-phase systems, HVAC run capacitors, GFCI protection, transformer turns ratios, kilowatt-horsepower conversion, voltage drop, NEC grounding, control circuits, and 24V HVAC controls.

Free HVAC Basic Electrical Practice Test 2. 25 questions on transformer primary and secondary sides, inductance (henry), parallel resistor equivalent values, electromagnet strength, current path resistance, magnetic reluctance, DC meter AC conversion, series/shunt ohmmeter types, megger insulation testing, halogen leak detector sensitivity, Ohm's Law applications, wattmeter connection, clamp-on ammeter operation, Kirchhoff's Laws, AC reactance, power factor correction capacitors, motor overload relay function, three-phase power calculations, transformer VA rating, and ground fault protection.

Test your knowledge of HVAC electrical fundamentals with this 25-question practice exam. Topics include motor starting current, capacitor selection, three-phase motor protection, NEC 440 requirements, motor winding testing, and compressor electrical diagnostics.

Advance your HVAC electrical knowledge with this 25-question practice exam. Topics include transformer core construction, contactors vs relays, VFD motor control, reversing valve wiring, 24V control circuits, HACR breakers, NEC 110.3(B) compliance, capacitor testing, and clamp-on ammeter technique.