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NATE HVAC Certification Exam 2025
Prep- Air Conditioning & Heat Pump —
Complete Q&A Study Guide (Verified
Questions & Answers)
d (all of the above: clear, complete, concise) - CORRECT ANSWER It is important to be ____ in filling out service orders so that office staff, other technicians, and customers will know what work you completed on the job. a. clear b. complete c. concise d. all of the above d (Refrigerant) - CORRECT ANSWER When explaining to a customer that you have adjusted the system charge, which of the following terms is most appropriate? a. Freon b. Gas c. Juice d. Refrigerant a (can help you diagnose the problem) - CORRECT ANSWER Listening carefully to what a customer is telling you ____. a. can help you diagnose the problem b. is a waste of time c. is not necessary
d. often will only confuse you b (listen to the customer first, then ask questions) - CORRECT ANSWER When you arrive at a service call and meet the customer, you should ____. a. ask questions first, then listen to what the customer has to say b. listen to the customer first, then ask questions c. avoid discussion with the customer d. remind the customer that you are the professional and get on with your work b (1,600 ft3) - CORRECT ANSWER What is the volume of a room that measures 10 ft by 20 ft with an 8-ft ceiling? a. 800 ft b. 1,600 ft c. 2,400 ft d. 3,200 ft b (1,200 CFM) - CORRECT ANSWER What is the CFM requirements for an 1,800-ft2 house with 8-ft ceilings, if five air changes per hour are needed? a. 400 CFM b. 1,200 CFM c. 1,600 CFM d. 2,400 CFM c (1,600 CFM) - CORRECT ANSWER What is the CFM requirement for an 2,400-ft2 house with 8-ft ceilings, if five air changes per hour are needed?
Note: Velocity = 4005 x (the square root of velocity pressure) d (all of the above: honest, loyal, patient) - CORRECT ANSWER Customers depend on you to be ____. a. honest b. loyal c. patient d. all of the above c (demonstrate system operation and describe basic maintenance procedures to the customer) - CORRECT ANSWER Before leaving a service call, you should be sure to ____. a. ask the customer for referrals b. collect payment in cash if possible c. demonstrate system operation and describe basic maintenance procedures to the customer d. try to sell the customer an equipment upgrade d (All of the above: it can cut hard or soft drawn copper; it leaves no metal shavings to contaminate the system; it produces a clean, square cut.) - CORRECT ANSWER What is the advantage of using a tube cutter to cut copper pipe? a. It can cut hard or soft drawn copper b. It leaves no metal shavings to contaminate the system c. It produces a clean, square cut d. All of the above a (soft drawn copper) - CORRECT ANSWER Spring-type benders may be used on ____.
a. soft drawn copper b. hard drawn copper c. all copper pipe d. steel pipe a (make a mechanical joint in tubing) - CORRECT ANSWER A flaring tool is used to ____. a. make a mechanical joint in tubing b. measure pipe diameters c. remove burrs from piping d. solder tubing without the use of coupling d (solder tubing without the use of couplings) - CORRECT ANSWER A swaging tool is used to ____. a. cut copper tubing b. make a mechanical joint in tubing c. remove burrs from piping d. solder tubing without the use of couplings a (It is very accurate) - CORRECT ANSWER What is one of the advantages of a glass-stem thermometer? a. It is very accurate b. It is very durable c. It comes with a digital readout d. Non of the above b (dry-bulb) - CORRECT ANSWER In discussing human comfort, the temperature most commonly referred to is ____. a. dew point
a. Manifold gauge b. Micron analyzer c. Recovery machine d. Vacuum pump b (microns) - CORRECT ANSWER A vacuum gauge reads pressure in ____. a. inches of mercury b. microns c. psia d. psig c (Micronic) - CORRECT ANSWER Which of the following is not a method of leak detection? a. Soap bubbles b. Electronic c. Micronic d. Ultrasonic a (Recovery machine) - CORRECT ANSWER To prevent the release of refrigerant to the atmosphere while removing it from a system, what type of equipment must be used? a. Recovery machine b. Recycling machine c. Reclaim machine d. Vacuum pump b (air velocity) - CORRECT ANSWER An anemometer uses a small fan blade to measure ____.
a. air pressure b. air velocity c. air volume d. static pressure c (No flux is required) - CORRECT ANSWER What is one of the advantages of using silver brazing rods for copper-tocopper joints? a. A lower melting temperature is required b. A propane torch is normally used c. No flux is required d. No nitrogen purge is needed d (all of the above) - CORRECT ANSWER "Housekeeping" includes ____. a. disposal of waste b. fire prevention and protection c. proper storage of materials d. all of the above b (Goggles) - CORRECT ANSWER What type of eye protection should you wear when drilling overhead? a. Face shield b. Goggles c. Side shields d. Spectacles b (DOT) - CORRECT ANSWER What agency regulates cylinders and chemicals transported in a service vehicle? a. ASHRAE
d (All of the above: asphyxiating, flammable, toxic) - CORRECT ANSWER Which of the following categories could be considered a hazardous atmosphere in a confined space? a. Asphyxiating b. Flammable c. Toxic d. All of the above a (Low oxygen level) - CORRECT ANSWER Which of the following best describes an asphyxiating atmosphere? a. Low oxygen level b. Presence of ammonia c. Presence of carbon monoxide d. Presence of nitrogen c (5 ft) - CORRECT ANSWER If a ladder is placed against a wall that is 20 ft tall, what is the proper distance away from the wall for the base of the ladder? a. 3 ft b. 4 ft c. 5 ft d. 6 ft c (maintain three points of contact) - CORRECT ANSWER When using a ladder, you should always ____. a. extend the ladder 18 in. above the roof line b. face away from the ladder c. maintain three points of contact d. straddle the space between the ladder and a nearby object
a (Disconnect and lock out power before starting unless testing requires the power to be on) - CORRECT ANSWER What is one of the most important safety precautions that you can take when working on electrical equipment? a. Disconnect and lock out power before starting unless testing requires the power to be on b. Keep one hand in your pocket while working on the power circuit c. Label all hot wires before starting d. Wear gloves suitable for high voltages a (When current travels through a ground path other than the neutral)
- CORRECT ANSWER When does a ground fault circuit interrupter open an electric circuit? a. When current travels through a ground path other than the neutral b. When the circuit is overloaded c. When there is a short circuit d. All of the above b (only by the person who installed the locks) - CORRECT ANSWER Proper lockout/tagout procedures state that locks placed on a lockout device may be removed ____. a. by anyone on the job site b. only by the person who installed the locks c. only after all fuses have been replaced d. only when the equipment is grounded c (evaporation) - CORRECT ANSWER A natural cooling process produced by moisture on the skin changing to lowpressure steam is called ____.
a. controlled b. kinetic c. potential d. quantum c (sensible) - CORRECT ANSWER Heat that you can feel and measure directly with a thermometer is called ____ heat. a. absolute b. latent c. sensible d. super b (latent) - CORRECT ANSWER The heat energy change associated with a phase (state) change is called ____ heat. a. absolute b. latent c. sensible d. super d (specific) - CORRECT ANSWER The amount of heat (Btu) needed to raise the temperate of 1 lb of a substance 1°F is called the ____ heat of the substance. a. absolute b. latent c. sensible d. specific b (liquid, solid) - CORRECT ANSWER The latent heat of fusion is the amount of energy required to change 1 lb of a substance from the ____ phase to the ____ phase without changing its temperature.
a. liquid, vapor b. liquid, solid c. solid, vapor d. vapor, liquid c (144 Btu) - CORRECT ANSWER At 32°F, 1 lb of ice can be changed to 1 lb of water by adding ____ Btu. a. 32 Btu b. 44 Btu c. 144 Btu d. 970 Btu d (970 Btu) - CORRECT ANSWER At 212°F, 1 lb of water can be changed to 1 lb of steam by adding ____ Btu. a. 32 Btu b. 44 Btu c. 144 Btu d. 970 Btu a (saturated) - CORRECT ANSWER When liquid and vapor phases of a substance exist together, and no more liquid can vaporize without more energy being added, the vapor is said to be ____. a. saturated b. stabilized c. subcooled d. superheated
a (latent, sensible) - CORRECT ANSWER Enthalpy includes both ____ and ____ heat energy. a. latent, sensible b. latent, specific c. sensible, specific d. specific, absolute d (weight) - CORRECT ANSWER The measurement of the force that gravity exerts is called ____. a. mass b. specific matter c. volume d. weight b (mass) - CORRECT ANSWER The amount of matter in a substance is called ____. a. gravity b. mass c. volume d. weight a (density) - CORRECT ANSWER Weight per unit volume or mass per unit of volume is called ____. a. density b. specific gravity c. specific mass d. specific volume
d (specific volume) - CORRECT ANSWER Volume per unit of mass or weight is called ____. a. density b. specific gravity c. specific mass d. specific volume c (0.075 lb/ft3) - CORRECT ANSWER Under standard conditions, air weighs approximately ____ lb/ft3. a. 0.055 lb/ft b. 0.065 lb/ft c. 0.075 lb/ft d. 0.085 lb/ft d (86°) - CORRECT ANSWER Solve to find the Fahrenheit temperature corresponding to 30°C. a. 32° b. 68° c. 70° d. 86° Note: 32°F = 0°C. 9/5°F = 1°C. °F = (9/5 x °C) + 32 °C = (°F - 32) x 5/ b (68°) - CORRECT ANSWER Solve to find the Fahrenheit temperature corresponding to 20°C. a. 32° b. 68° c. 70° d. 86°
d. unchanged b (1.2 ft3) - CORRECT ANSWER What is the new volume of 1 ft3 of air at 0°F when heated to 100°F? a. 1.0 ft b. 1.2 ft c. 2.0 ft d. 3.0 ft Note: Vf = Vi x (Tf / Ti) T = °F + 460 c (44.7 psia) - CORRECT ANSWER If gauge pressure reads 30 psi, what is the corresponding absolute pressure? a. 15.7 psia b. 34.7 psia c. 44.7 psia d. 60.7 psia c (Dalton's) - CORRECT ANSWER The law that applies to the total pressure exerted by a mixture of gases or vapors is called ____ Law. a. Boyle's b. Charles' c. Dalton's d. Newton's d (6.28 x 10^18) - CORRECT ANSWER A coulomb is a charge of ____ electrons.
a. 6. b. 628 c. 628 Million d. 6.28 x 10^ b (electron flow) - CORRECT ANSWER An ampere is a measurement of ____. a. electrical charge b. electron flow c. opposition to current d. potential energy b (force that moves electrons through a circuit) - CORRECT ANSWER Voltage is best described as the ____. a. amount of power being used in a circuit b. force that moves electrons through a circuit c. magnetic field surrounding a conductor d. resistance to the flow of electrons b (resistance) - CORRECT ANSWER Current in a circuit is limited by ____. a. heat b. resistance c. temperature d. voltage a (conductor) - CORRECT ANSWER A substance that permits the free movement of electrons is called a(n) ____. a. conductor
