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NEVADA HVAC TECHNICIAN LICENSE EXAM NEWEST 2026 UPDATE REAL PRACTICE EXAM QUESTIONS & CO, Exams of Mechanical Engineering

Stanford UniversityMechanical Engineering

NEVADA HVAC TECHNICIAN LICENSE EXAM NEWEST 2026 UPDATE REAL PRACTICE EXAM QUESTIONS & CORRECT ANSWERS | ALREADY GRADED A+

Typology: Exams

2025/2026

Available from 02/28/2026

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NEVADA HVAC TECHNICIAN LICENSE EXAM
NEWEST 2026 UPDATE REAL PRACTICE EXAM
QUESTIONS & CORRECT ANSWERS | ALREADY
GRADED A+
Content covered (most tested areas): Safety,
refrigeration cycle, electrical fundamentals, controls,
airflow, duct systems, load calculations, tools &
instruments, codes, combustion, troubleshooting, EPA
refrigerant handling, heat pumps, gas furnaces,
installation practices.
1. What is the primary function of the compressor in a refrigeration
system?
A. Condense refrigerant vapor
B. Meter refrigerant flow
C. Increase refrigerant pressure
D. Remove heat from air
Answer: C. Increase refrigerant pressure
The compressor raises the pressure and temperature of
refrigerant vapor to move it through the system.
2. Which refrigerant has zero ozone depletion potential (ODP)?
A. R-22
B. R-134a
C. R-11
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Partial preview of the text

Download NEVADA HVAC TECHNICIAN LICENSE EXAM NEWEST 2026 UPDATE REAL PRACTICE EXAM QUESTIONS & CO and more Exams Mechanical Engineering in PDF only on Docsity!

NEVADA HVAC TECHNICIAN LICENSE EXAM

NEWEST 2026 UPDATE REAL PRACTICE EXAM

QUESTIONS & CORRECT ANSWERS | ALREADY

GRADED A+

Content covered (most tested areas): Safety,

refrigeration cycle, electrical fundamentals, controls,

airflow, duct systems, load calculations, tools &

instruments, codes, combustion, troubleshooting, EPA

refrigerant handling, heat pumps, gas furnaces,

installation practices.

  1. What is the primary function of the compressor in a refrigeration system? A. Condense refrigerant vapor B. Meter refrigerant flow C. Increase refrigerant pressure D. Remove heat from air Answer: C. Increase refrigerant pressure The compressor raises the pressure and temperature of refrigerant vapor to move it through the system.
  2. Which refrigerant has zero ozone depletion potential (ODP)? A. R- 22 B. R-134a C. R- 11

D. R- 12

Answer: B. R-134a R-134a contains no chlorine, so it does not deplete ozone.

  1. Superheat is measured at the: A. Condenser outlet B. Evaporator outlet C. Compressor discharge D. Liquid line Answer: B. Evaporator outlet Superheat confirms that only vapor returns to the compressor.
  2. Subcooling is measured at the: A. Compressor inlet B. Evaporator inlet C. Condenser outlet D. Suction line Answer: C. Condenser outlet Subcooling verifies liquid refrigerant leaving the condenser.
  3. A capacitor in a single-phase motor is used to: A. Reduce voltage B. Increase current draw C. Improve starting torque D. Control speed Answer: C. Improve starting torque Capacitors create phase shift for stronger motor startup.
  4. The device that meters refrigerant into the evaporator is the: A. Accumulator B. TXV
  1. Ohm’s Law states that voltage equals: A. Current × Resistance B. Power ÷ Current C. Resistance ÷ Current D. Power × Resistance Answer: A. Current × Resistance V = I × R.
  2. A heat pump in heating mode extracts heat from: A. Indoor air B. Refrigerant only C. Outdoor air D. Electrical resistance Answer: C. Outdoor air Even cold air contains usable heat energy.
  3. The reversing valve is energized during: A. Cooling only (most systems) B. Heating only C. Both modes D. Defrost only Answer: A. Cooling only (most systems) Most manufacturers energize the valve for cooling operation.
  4. Static pressure measures: A. Air velocity B. Air temperature C. Resistance to airflow D. Humidity

Answer: C. Resistance to airflow High static pressure indicates airflow restriction.

  1. A cracked heat exchanger can cause: A. Refrigerant leak B. Carbon monoxide exposure C. Low airflow D. High voltage Answer: B. Carbon monoxide exposure Combustion gases may enter living spaces.
  2. The purpose of a filter-drier is to remove: A. Oil only B. Moisture and debris C. Heat D. Airflow restriction Answer: B. Moisture and debris Contaminants damage system components.
  3. Which tool measures refrigerant pressure? A. Manifold gauge set B. Psychrometer C. Anemometer D. Megohmmeter Answer: A. Manifold gauge set Standard tool for diagnosing system pressures.
  4. The evaporator coil is located: A. Outside the building B. In the duct plenum C. In the condenser

C. Superheated vapor D. Saturated vapor Answer: C. Superheated vapor Protects compressor from liquid slugging.

  1. A system low on refrigerant will typically show: A. High suction pressure B. Low suction pressure C. High subcooling D. High airflow Answer: B. Low suction pressure Less refrigerant means reduced evaporator pressure.
  2. The purpose of insulation on suction lines is to: A. Prevent freezing outside B. Maintain vapor temperature C. Increase pressure D. Improve oil flow only Answer: B. Maintain vapor temperature Prevents heat gain and condensation.
  3. Defrost control in heat pumps prevents: A. Compressor overheating B. Coil icing C. High voltage D. Refrigerant loss Answer: B. Coil icing Ice blocks airflow and reduces efficiency.
  4. BTU stands for: A. British Thermal Unit

B. Basic Temperature Unit C. Boiler Transfer Unit D. Balanced Thermal Utility Answer: A. British Thermal Unit Standard heat measurement.

  1. The liquid line carries refrigerant as: A. Low-pressure vapor B. High-pressure vapor C. High-pressure liquid D. Low-pressure liquid Answer: C. High-pressure liquid After condensation, refrigerant is liquid.
  2. A psychrometer measures: A. Pressure B. Humidity C. Voltage D. Airflow Answer: B. Humidity Uses wet-bulb and dry-bulb readings.
  3. The function of a relay is to: A. Reduce resistance B. Electrically isolate circuits C. Increase voltage D. Store energy Answer: B. Electrically isolate circuits Allows low-power control of high-power devices.

Answer: B. Insulation resistance Used on motors and compressors.

  1. Proper duct sealing improves: A. Refrigerant charge B. System efficiency C. Electrical load D. Compressor speed Answer: B. System efficiency Prevents conditioned air loss.
  2. The condenser fan motor failure will cause: A. Low head pressure B. High head pressure C. Low airflow indoors D. No thermostat control Answer: B. High head pressure Heat cannot be expelled outdoors.
  3. A pilot light that goes out repeatedly may indicate: A. Dirty evaporator B. Faulty thermocouple C. Low refrigerant D. Bad capacitor Answer: B. Faulty thermocouple Thermocouple shuts gas if flame is not sensed.
  4. Voltage in most residential HVAC control circuits is: A. 12 V B. 24 V C. 48 V

D. 120 V

Answer: B. 24 V Standard low-voltage control level.

  1. A clogged air filter primarily reduces: A. Refrigerant pressure B. Airflow C. Voltage D. Humidity control Answer: B. Airflow Leads to coil freezing and inefficiency.
  2. Which component removes heat from refrigerant? A. Evaporator B. Compressor C. Condenser D. Metering device Answer: C. Condenser Rejects heat to outdoor air.
  3. Oil return to the compressor depends on: A. Proper refrigerant velocity B. Thermostat setting C. Electrical resistance D. Coil size only Answer: A. Proper refrigerant velocity Oil travels with refrigerant flow.
  4. A scroll compressor differs from a reciprocating compressor by using: A. Pistons
  1. Refrigerant recovery is required by: A. Local utility companies B. EPA regulations C. Manufacturer warranty D. Insurance providers Answer: B. EPA regulations Protects the environment from emissions.
  2. A TXV senses temperature using a: A. Bulb B. Float C. Sensor wire D. Thermostat Answer: A. Bulb Bulb pressure controls valve opening.
  3. A furnace blower delay allows: A. Immediate airflow B. Heat exchanger warm-up C. Lower gas usage D. Reduced voltage Answer: B. Heat exchanger warm-up Prevents blowing cold air at startup.
  4. The discharge line is also called the: A. Liquid line B. Suction line C. Hot gas line D. Return line

Answer: C. Hot gas line Carries high-temperature vapor.

  1. A dual-run capacitor serves: A. Compressor only B. Fan only C. Both compressor and fan D. Thermostat Answer: C. Both compressor and fan Common in residential condensers.
  2. The most common cause of compressor failure is: A. Electrical burnout B. Loss of lubrication C. Overcharging D. Dirty ducts Answer: B. Loss of lubrication Oil problems quickly damage internal parts.
  3. Proper evacuation removes: A. Refrigerant B. Moisture and air C. Oil D. Heat Answer: B. Moisture and air Vacuuming prevents acid formation and inefficiency. If you want, I can provide:
  • Questions 51– 100

D. Single-speed operation Answer: B. Variable air volume It adjusts airflow for comfort and efficiency.

  1. A pressure switch in an HVAC system is primarily used to: A. Sense airflow or refrigerant pressure B. Control voltage C. Regulate temperature D. Open the gas valve Answer: A. Sense airflow or refrigerant pressure Shuts the system down if unsafe conditions exist.
  2. A system that freezes coils likely has: A. Low airflow or low refrigerant B. High voltage C. Oversized ductwork D. Dirty condenser only Answer: A. Low airflow or low refrigerant Insufficient heat absorption causes freezing.
  3. The term “latent heat” refers to: A. Heat that changes temperature B. Heat absorbed during phase change C. Electrical heat D. Combustion heat Answer: B. Heat absorbed during phase change For example, evaporation absorbs latent heat.
  4. Which refrigerant is no longer used in new equipment due to ozone depletion? A. R-410A

B. R- 22

C. R-134a D. R-407C Answer: B. R- 22 R-22 is phased out under the Montreal Protocol.

  1. A multimeter set to measure resistance is used to: A. Measure voltage B. Measure current C. Check continuity and resistance D. Check airflow Answer: C. Check continuity and resistance Verifies wiring and motor windings.
  2. The main function of a condenser coil is to: A. Absorb heat from indoor air B. Remove heat from refrigerant to outdoor air C. Increase suction pressure D. Increase refrigerant superheat Answer: B. Remove heat from refrigerant to outdoor air Releases heat absorbed from indoors.
  3. In a split system, the indoor unit is called the: A. Condenser B. Evaporator C. Compressor D. Expansion device Answer: B. Evaporator Absorbs heat from indoor air.

Answer: B. Anemometer Measures cubic feet per minute or velocity.

  1. A low-voltage transformer in HVAC typically converts: A. 120V to 24V B. 24V to 120V C. 12V to 24V D. 220V to 110V Answer: A. 120V to 24V Provides safe control voltage to thermostat and relays.
  2. A compressor that hums but does not start likely has: A. Electrical problem or bad start capacitor B. Low refrigerant C. High airflow D. Open TXV Answer: A. Electrical problem or bad start capacitor Start winding issues prevent rotation.
  3. In cooling mode, the evaporator coil temperature is typically: A. 40–55°F B. 70–75°F C. 120–140°F D. 32–35°F Answer: A. 40–55°F Optimal for dehumidification and comfort.
  4. Heat pump efficiency is measured by: A. SEER B. HSPF C. CFM

D. PSI

Answer: B. HSPF Heating Seasonal Performance Factor evaluates heating efficiency.

  1. A furnace flame rollout switch shuts off: A. Suction pressure B. Gas valve if flame escapes burner area C. Compressor D. Thermostat Answer: B. Gas valve if flame escapes burner area Prevents fire hazards.
  2. A duct static pressure reading that is too high indicates: A. Oversized duct B. Airflow restriction C. Proper airflow D. Correct blower speed Answer: B. Airflow restriction Blocked or undersized ducts create high static pressure.
  3. A dual fuel system combines: A. Electric and gas heat B. Two compressors C. Heat pump and water coil D. Two thermostats Answer: A. Electric and gas heat Switches fuel source for efficiency depending on outdoor temperature.