NATE CORE 2023 Exam Practice Questions and answers

NATE CORE 2023 Exam Practice Questions and answers Ch. 1-1 The ability to utilize all types of communication skills is to the HVACR technician. a) not as important as "hands-on" technical skills b) somewhat important c) unimportant d) very important - correct answer d) very important Ch. 1-2 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 - correct answer d) all of the above Ch. 1-3 When explaining to a customer that you have topped off the system charge, which of the following terms is most appropriate? a) freon b) gas c) juice d) refrigerant - correct answer d) refrigerant Ch. 1-4 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 - correct answer a) can help you diagnose the problem Ch. 1-5 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 - correct answer b) listen to the customer first, then ask questions This study source was downloaded by from CourseH on :34:07 GMT -05:00 Ch. 1-6 What is the volume of a room that measures 10 ft by 20 ft with an 8 ft ceiling? a) 800 ft^3 b) 1,600 ft^3 c) 2,400 ft^3 d) 3,200 ft^3 - correct answer b) 1,600 ft^3 This study source was downloaded by from CourseH on :34:07 GMT -05:00 Ch. 1-7 What is the cfm requirement for an 1,800 ft^2 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) 1,600 cfm - correct answer b) 1,200 cfm Ch. 1-8 What is the cfm requirement for a 2,400 ft^2 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 - correct answer c) 1,600 cfm Ch. 1-9 What is the cross sectional area of a 10 in. round metal duct? a) 79 in.^2 b) 200 in.^2 c) 314 in.^2 d) 418 in.^2 - correct answer a) 79 in.^2 Ch. 1-10 How fast does air with a velocity pressure of 0.20 in. w.g. move through a round duct? a) 400 ft/min b) 1,200 ft/min c) 1,600 ft/min d) 1,800 ft/min - correct answer d) 1,800 ft/min Ch. 1-11 How fast does air with a velocity pressure of 0.20 in. w.g. move through a square duct? a) 400 ft/min b) 1,200 ft/min c) 1,600 ft/min d) 1,800 ft/min - correct answer d) 1,800 ft/min Ch. 1-12 Customers depend on you to be . a) honest b) loyal c) patient d) all of the above - correct answer d) all of the above Ch. 1-13 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 This study source was downloaded by from CourseH on :34:07 GMT -05:00 d) try to sell the customer an equipment upgrade - correct answer c) demonstrate system operation and describe basic maintenance procedures to the customer Ch. 2-1 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 - correct answer d) all of the above Ch. 2-2 Spring-type benders may be used on . a) soft drawn copper b) hard drawn copper c) all copper pipe d) steel pipe - correct answer a) soft drawn copper Ch. 2-3 A flaring tool is used to . a) make a mechanical joint in tubing b) measure pipe diameters c) remove burrs from piping d) separate pipe fittings - correct answer a) make a mechanical joint tubing Ch. 2-4 A swagging 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 - correct answer d) solder tubing without the use of couplings Ch. 2-5 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) none of the above - correct answer a) it is very accurate Ch. 2-6 In discussing human comfort, the temperature most commonly referred to is . a) dew point b) dry-bulb c) wet-bulb d) Fahrenheit - correct answer b) dry-bulb Ch. 2-7 A sling psychrometer uses two glass-stem thermometers. One measures drybulb, and the other measures . a) dew point b) enthalpy c) relative humidity This study source was downloaded by from CourseH on :34:07 GMT -05:00 d) wet-bulb - correct answer d) wet-bulb Ch. 2-8 A standard refrigeration manifold uses what type of element to measure pressure? a) Bellows b) Bourdon tube c) Diaphragm d) Spring - correct answer b) Bourdon tube Ch. 2-9 What is the pressure range of a standard compound gauge on a refrigeration mainfold? a) 0 to 350 psig b) 0 to 500 psig c) 30 in. Hg to 350 psig d) 30 in. Hg to 500 psig - correct answer c) 30 in. Hg to 350 psig Ch. 2-10 What is the best tool for removing moisture and noncondensibles from a system before adding refrigerant? a) Manifold gauge b) Micron analyzer c) Recovery machine d) Vacuum pump - correct answer d) Vacuum pump Ch. 2-11 A vacuum gauge reads pressure in . a) inches of mercury b) microns c) psia d) psig - correct answer b) microns Ch. 2-12 Which of the following is NOT a method of leak detection? a) soap bubbles b) electronic c) micronic d) ultrasonic - correct answer c) micronic Ch. 2-13 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 - correct answer a) Recovery machine Ch. 2-14 An anemometer uses a small fan blade to measure . a) air pressure b) air velocity c) air volume This study source was downloaded by from CourseH on :34:07 GMT -05:00 d) static pressure - correct answer b) air velocity Ch. 2-15 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 - correct answer c) No flux is required Ch. 3-1 Housekeeping includes . a) disposal of waste b) fire prevention and protection c) proper storage of materials d) all of the above - correct answer d) all of the above Ch. 3-2 What type of eye protection should you wear when drilling overhead? a) Face shield b) Goggles c) Side shields d) Spectacles - correct answer b) Goggles Ch. 3-3 What agency regulates cylinders and chemicals transported in service vehicles? a) ASHRAE b) DOT c) EPA d) OSHA - correct answer b) DOT Ch. 3-4 Material safety data sheets . a) contain information about personal protective equipment b) do NOT provide recommendations regarding emergency procedures c) should be kept in a safe place off site d) should be read after any chemical products have been used - correct answer a) contain information about personal protective equipment Ch. 3-5 When should oxygen be used in a refrigeration system? a) To clear a restriction in the line b) To pressurize for leak-testing c) To purge lines for brazing d) Never - correct answer d) Never Ch. 3-6 What is the maximum safe storage temperature of a refrigerant cylinder filled to 80% capacity by weight? a) 120 degrees F b) 125 degrees F c) 130 degrees F d) 135 degrees F - correct answer b) 125 degrees F This study source was downloaded by from CourseH on :34:07 GMT -05:00 Ch. 3-7 Which of the following classifications of fire extinguishers should be used for electrical fires? a) A b) B c) C d) D - correct answer d) D Ch. 3-8 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 - correct answer d) All of the above Ch. 3-9 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 - correct answer a) Low oxygen level Ch. 3-10 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 - correct answer c) 5 ft Ch. 3-11 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 - correct answer c) maintain three points of contact Ch. 3-12 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 - correct answer a) Disconnect and lock out power before starting unless testing requires the power to be on Ch. 3-13 When does a ground fault circuit interrupter open an electric circuit? a) When current travels through a ground path other than the neutral This study source was downloaded by from CourseH on :34:07 GMT -05:00 b) When the circuit is overloaded c) When there is a short circuit d) All of the above - correct answer a) When current travels through a ground path other than neutral Ch. 3-14 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 - correct answer b) only by the person who installed the locks Ch. 4-1 A natural cooling process produced by moisture on the skin changing to lowpressure steam is called . a) conduction b) convection c) evaporation d) radiation - correct answer c) evaporation Ch. 4-2 During the heating season, human comfort can be enhanced without changing the temperature of the air by . a) adding moisture b) reducing moisture c) increasing air filtration d) increasing air speed - correct answer a) adding moisture Ch. 4-3 During the cooling season, dampers on bypass humidifiers should be . a) completely closed b) completely open c) set at 25% open d) set at 50% open - correct answer a) completely closed Ch. 4-4 All matter can exist as a . a) liquid b) solid c) gas d) all of the above - correct answer d) all of the above Ch. 4-5 Stored energy is called energy. a) controlled b) kinetic c) potential d) quantum - correct answer c) potential This study source was downloaded by from CourseH on :34:07 GMT -05:00 Ch. 4-6 Heat that you can feel and measure directly with a thermometer is called heat. a) absolute b) latent c) sensible d) super - correct answer c) sensible